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AMD 3900X Overclocking explained... How to get improvements!

2019-07-10
well it's kind of like AMD month here on YouTube I'm sure you guys as inboxes have been it absolutely exploding well the AMD rise in and Radeon stuff now today we're gonna talk about something extremely important as important as it could possibly get when it comes to AMD rise in and that is the fact that we actually changed out the extension cord with its unique radiator mounted pump premium sleeve tubing infinity mirror RGB block and cam software control the Kraken m22 all-in-one liquid cooler from NZXT is the perfect choice for small form-factor liquid cooling to learn more click the link in the description below alright so we're gonna be doing some overclocking here today with the 3900 X interesting discussion to take place here because if you've looked at the reviews and we said in our review that we were going to be doing a separate video regarding overclocking but I'm you've probably already seen by now that there is not much overclocking Headroom so we're going to do today is we're going to talk about some of the settings here they're pretty much the same as previous rise them we're gonna use our crosshair hero board as an example we're gonna go through some of the settings what they mean then we're gonna show you the max over clocks we can achieve on our 3900 X it should be no surprise where it's going to land it's pretty consistent across the board on where people are ending up we're gonna talk about how to sort of prepare for overclocking and what to expect whether or not it even is worth it this time around when it comes to AMD now obviously the 3900 X being the top tier at least until later this year with a 39 50 X comes out four more cores this is a small process seven nanometer with 12 cores 24 threads on the mainstream sized I guess package will call it because member there's more than one die in there so it's a lot of focused heat so we've ditched the the prism cooler and obviously went with a corsair h 100 i a I Oh cooler but what you're gonna see is that things still get pretty warm so you obviously want to make sure that you're going to be having cooling taken into consideration with your overclocking because we're not in a chassis here airflow over the V RMS is also very important so I just said 120 millimeter fan here to blow directly on the power delivery if you've got a chassis with plenty of airflow you wouldn't have to do this but obviously for this demonstration we're doing direct airflow graphics card is a really matter that's completely independent we just have a twenty to sixty sitting on are we gonna be doing any gaming today just a little bit but we're looking at basically just max performance we can get out of CPU instructions and then we have a 1200 watt power supply here this is overkill for this what you want to make sure you have a good quality power supply that you have nice beefy 12-volt rails in there and that you have more obviously output then you need so I would still recommend something like a 700 or maybe an 800 watt power supply for this because then you could stay in that nice efficiency curve the other thing you obviously need is a motherboard with an overclocking chipset usually the 70s cue is going to have all the bells and whistles and stuff that you want with beefy VRMs beefy chipset coolers all that sort of stuff so that you don't run out of power delivery because that more often than not when it comes to overclocking horizon ends up to being a point of failure because people are trying to overclock these high core count mainstream CPUs from AMD with motherboards that are not exactly robust enough to to handle that so like I said we're using the crosshair hero motherboard but here's some of the things you need to keep in mind and this is gonna hold true for any motherboard manufacturer I've never been a part of any series launch where the BIOS didn't go through some sort of a maturing process where some of the stuff I'm telling you it's just completely caddywhompus otherwise of caddywhompus it's a gray hair thing if you don't have gray hair don't use that term it's our turn but what I want to show here is even though we are on the latest BIOS that we could basically get our hands on 7702 there there is a lot of weirdness that's still going on FiOS you early adopters you get to deal with this and guess what we're all bug testers okay so keep that in mind if you bought rise in 3000 in terms of the motherboards there's some stuff that you need to be aware of and what I'm gonna show you right now is even though we are set to defaults this is the way it ships this is out of the box you plug in your CPU you turned it on you touch nothing this is the way it is as of today with this BIOS our CPU is sitting at one point four seven three volts I can tell you right now that's the reason why even with an H 100 I we are sitting at 40 see a title that's way too high because that is about a hundred or 200 millivolts or so actually higher than we need it to be for stock settings that there's there's 0x use for that I should have never let this fly they'll probably come back and say all the reasons why this is fine and I'm telling you that's my opinion it's not fine so the reason why it's not fine is we started hitting over-temperature shut down on the cpu because of it that's not fine and when that happens with an AI oh there there's nothing you could say to excuse that same thing with that voltage on the memory we're running 21 33 base megahertz we did that for our testing for a reason and we'll show you why in this video one point 488 volts is higher than do CP or XMP settings if you guys unaware DLC P is the AMD version of XMP which is basically where it tightens up the timings and speeds up the memory it's a it's the actual printed numbers on the modules that's why that's different than what's printed on the module that's way too high that should be one point 3 5 or 1 point 2 4 stock speed so again we're over vaulting the memory unnecessarily the other thing here check this out SOC voltage this is the voltage for the fabric the the interconnect between the chip 'let's on the actual CPU substrate so that should actually be more like 1.15 ish that's 1.3 - I have no idea why it's so high in fact even according to Bayer Bauer doing ln2 overclocking he said don't exceed like one point two eight to one point three at the most we're at one point three - out of the box so that's a little this that's a little concerning so I'm gonna manually set the CPU right now to one point just go one point three okay and then our SOC voltage we're gonna set that to again manual one point two okay dear and voltage again one point to go one point three five we'll just go to the dlc people to to know we're going to move it and then the CL do VDD G voltage this is another piece of the fabric so these two voltages the SOC and the VDD G are tied together the SOC is the input input voltage for the BDD G that needs to be at least a hundred millivolts below this stock for that is 0.95 volts or one volt so I'm setting it to 1 volt I have no idea what it's sitting at now but based on what I'm seeing here in the PLL 1.8 voltage sitting at two point one obviously is too high so I have no reason to believe that the VDD G wouldn't be over voltage but hey they got the Southbridge right so at least they're 1 for like 12 so anyway now that we've gone in and unworked our voltage settings that the CPU or the motherboard did on its own now we're ready to actually overclock in fact now we're ready to actually just show you the benchmarks and we'll talk about the overclock and whether or not they're even worth it so why don't we just go ahead and show you this chart I guess that's why you're here I hope if you're just here to look at my pretty face well you know there's Instagram there's Twitter Facebook kind of dead haven't uploaded there in like three years all right so after spending the last couple of days because like I said we we did some more back locking yester actually a lot of overclocking yesterday and then went back through and redid all of our testing today for sanity checks and even added a couple of tests that we weren't planning on so here's the deal the 3900 X and admittedly this is only the 3900 X the behavior on 3700 X and the other skews might be different you can look at all the reviews that have made it out in the market both written and video format and you'll find that for 2 for 3 as a sweet spot very few people hit 4 or 4 if they did it took a lot of volts to get there some people got complete duds and lots of silicon lottery where they couldn't even get 4:1 and so it's one of those things that it's kind of interesting because the way that the performance boost that's built into the CPU is it depending on the workload it's gonna boost higher or lower now you can see as high as 4.6 gigahertz on single core and that's reflected when we do something like r15 or are twenty or something where we can physically tell it only use one core the problem is with so much software now being at least multi-threaded to the point to where it could utilize four cores or more even though we've got twenty four threads sitting here what starts to happen is you don't see one or two cores bouncing at 4.6 you see them dropping down to more like the 4.3 4.2 range what we saw in almost every single one of our tests whether it be premiere or it be worse like blender but we even did a far cry 5 test because we know that's a multi-threaded game but we also know it's a bit of a sleepy bottleneck for a lot of different reasons but what we saw was we sat more so around the 4 to 4 point 2 to 5 range and that's only about 75 mega Hertz ish because it would bounce slightly lower than our max manual OC which is 4.3 on all course so the takeaway from that is that the 4.6 looks really good on paper but depending on what you're doing you're not gonna see that that often even in games even though there were threads sitting completely idle with far cry 5 at sitting at 0% utilized we still were seeing about 4 to 2 for 2 to 5 on those cores bouncing around and sometimes as low as 4 1 4 1 5 it bounces all around it's doing what it's supposed to do but you would think because most people go our single threat optimization that's not entirely true these days because most games that have been developed in the last four or five years are using multi-threading now and as soon as you go past one core being loaded you're not going to see that for six you're not going to see a single core bouncing around at four six and the reason for that is because the CC X's have to act in a grouping so each CC X is independent of the other however you cannot differentiate core speed between different cores on the same CC X so that's why you see them kind of moving around as a group so as soon as you're beyond that one core boost you're not going to see the for six but core behavior is only one side of the coin you have to take memory into account too you can't directly compare Intel and AMD though like frequency wise the same as with GPUs between AMD and NVIDIA you can't just compare them for frequency speed either because they're two completely different architectures what you're dealing with here and rise in and this is no different this has been the case all along what you're seeing is a maturity of their chip --let kind of an infrastructure here where you've got two different CC X's with half the amount of cores on each plus you know SMT s on both sides so six and twelve on either side so one could argue it's two six core twelve thread CPUs kind of I think Intel use the joke of glued together well that's called infinity fabric and you have control over that as well and the speed between the communication or the Infinity fabric is known as the F clock on here which we showed so some of our testing methodology included not only overclocking the memory and then tightening up the timings and playing around with that or just letting DL CP do it and then we overclocked the memory as well as the fabric and what we saw if you look at those charts is when it comes to productivity depending on the title determined whether or not we saw any improvement at all so that explains why in Premiere we saw a minimal difference between just overclocking the memory and leaving the the CPU speed the same and then we saw a big improvement by leaving the overclocked memory in place but then increasing the fabric or the speed between the CC X's and then we saw again by overclocking 24.3 a very minimal a two-second difference because again it's only about a seventy five megahertz overclock versus where it was losing to on its own but when it comes to games on the other hand far cry 5 we chose this title specifically now we're be aware this is only one title we want to do a whole other piece of content where we go through and test all of our games with our overclocks and all that sort of stuff to see if we see the type of improvements we saw in Far Cry 5 across the board but we chose far cry 5 because we know for a fact it's very CPU bound we know that the CPU is definitely holding back GPUs even as far down as like the 2060 and so that's indicative of the fact that it's only about 65 between 65 and 50 percent utilized on our 2080 Ti that's overclocked so for the testing we did 1080p normal settings because we're trying to get the FPS high to put more of a strain on the CPU now if we had gone 1440 and up the the eye candy would have taken a lot of that load up the CPU and it wouldn't have been indicative of whether or not the overclocking improved the gaming performance because we had to induce a bottleneck that was the point and so we saw a pretty linear improvement where when we upped the memory we saw a significant improvement to not only min and Max but average and then when we went with the F clock improvement we saw again a fairly large jump and then what shocked me to be honest is because we were monitoring the core clocks and you can see it on this overlay that it was still boosting to about four point two to five again with some coarse sitting at 0% not being utilized at all that just means the game physically wasn't asking for any more than that so I'm going to pause the video here for a second and just kind of chime in on something I fail to mention here in my my talking head portion you might be wondering why we only went to 3,600 on the memory and we didn't push it farther than the do CP settings well that's because AMD is very adamant about letting us know that if you go above 3,600 and 1800 megahertz on the the F clock and 36 hundred megahertz on the memory you dropout of one to one you go two to one when it comes to the memory controller and that you would have to go in there and fine-tune the actual you clock to be able to go in there and start getting that speed back so one of the things that what we were experiencing but when above 3,600 was massive frame per second stuttering in far cry 5 we would see some nominal improvements and in some of the synthetics and stuff in fact the FPS was not reflected as being poor we lost a little bit once we went above 3600 on the average FPS but the stuttering it remind you the best describe it is it looked like SLI micro stutter but that's just because of the fact that we dropped out of one to one and went two to one when it comes to the memory controller and at this current state at least I'm filming this video we had no control over the U clock for trying to bump up the memory controller speed again so just want to put that out there seeing an overclock should have helped on that single core but it helps more than I thought because even though we jumped from four point two to five to four point three we saw again a significant improvement to mid max an average now some might be going well but J you could have potentially hurt the results because if you just left it alone it would have boosted the four point six but no like I said earlier that's not the case that's why some of the ideology out there have you know single core single core single core is there's not a lot these days that truly is using only single core and if you are doing something that's using only single core why would you buy such a heavily multi-threaded CPU in the first place so it's one of those things where when it comes to overclocking yeah there's improvements to be had and what seemed fairly marginal is an improvement nonetheless by just changing a couple of settings on the screen and as long as you had adequate cooling keeping it cool is another whole discussion we saw a t3c on water once we overclocked at only one point three seven five volts it can get away with one point three five I just did one point three seven five because that's still lower than a lot of the reviewers were saying they had to use in terms of voltage so I'm curious is what the temperatures were an air cooler would have a hard time keeping the CPU tame again that's because you have to seven nanometer chip --let's on there plus a 14 nanometer IO chip late-- how also handling the memory controllers you have a lot of focus t remember we are talking 1920 X number of CPU cores in half the size versus thread Ripper just a couple years ago so they have not only surance the process they've shrunk the package as well which is why you're seeing a lot of heat with this CPU to be honest it has me a little bit concerned about the 39 50 X coming out later this year because it's four more cores and eight Moore's threads than the 3900 X but you know all in all there was a lot of discussion about AMD just sucking when it comes to overclocking and I mean that's kind of true we're not seeing like these massive overclocking Headroom like you're used to seeing on Intel but as much as I know this sounds like a shell discussion for AMD it's it's a discussion worth having where Intel has had time to sort of refine its process this is an entirely new architecture for AMD of course it's built upon at Zen architecture as we know but if you think about it Intel dropped the Northbridge with Ivy Bridge Sandy Bridge had a North Bridge but Ivy Bridge was where they moved in on to the CPU and if you remember correctly we were still sitting around the for 142 you could probably many overclock to like the 4 3 4 4 range the 4770k came out where they they shrunk an even more and then it's one of those things where it got incredibly hot sure they removed the the solder Tim but we still were seeing a massive amount of heat if you try to overclock pass like 4.5 then when skylake came out is where we saw kind of the maturity of the manufacturing process and we've been based off skylake ever since but it's been about 4 years that that process has now been refined and if you think about it ix gin is the first time we actually saw 5 gigahertz being readily achievable across the board it took a while to get there it's gonna take a while for AMD's process to mature as well to where we could potentially see higher overclocks I don't know if we're gonna ever see 5 gigahertz on Zen - I have no idea what the maturity process is gonna be like but the fact that with even a marginal overclock like we have here and this this is marginal this was nothing but turning on XMP /d OCP profile moving our affinity fabric from 1400 megahertz to 18 and then doing a manual 4.3 overclock on all cores got us improvements across the board some minor some major so that's why we want to do a gaming version of this where we only look at games to see if that holds true across all different titles so anyway guys that's been our overclocking video here with the 3900 X I've seen a lot of discussion taking place some arrogant some educated and it's just this is our results and this is the way it kind of came out so add our results to the giant mix of endless AMD's and two topics and discussions and videos are out there right now and formulate your own opinion and what makes sense to you and where the value is it's one of those things do you want more cores would you sacrifice some of that core clock and then you could play around with a bunch of different things like VMware you know doing virtual machines and maybe play around with some servers and just have a lot of fun or do you want to go with less cores but you can find the Intel side of things but have a superior core clock which makes the IPC look better because although the IPC is better on AMD you have more cycles happening on Intel which makes it seem better in the long run because that's obviously the way that the scale tips so sign up in the comments below how you guys feel about where we landed with our overclocks it seems like we're right in line with one of the other reviewers are seeing we've had a solid I know probably 15 hours worth of testing now to get to these results on just these few benchmarks and we stand by these results so sound off in the comments below guys subscribe if you're new around here and you wanna see any other rise in or radeon based content let us know what kind of test you'd like to see we'll do our best to incorporate see you guys
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