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Crossflow vs Dual Pass Radiator... Which is better?

2018-07-18
what's up guys Jays $0.02 here and we're gonna continue our summer months of cooling series something I do every single summer and something I've always wanted to test I've never had the opportunity to now is a cross-flow radiator versus a standard dual pass radiator in which one is actually better or does it make a difference at all hopefully we can find out today and put all of the guesswork to bed is that right so how you say that stuff I don't know we're gonna test it today's video is sponsored by audible and these summer months are known as the travel months and that has definitely been true for me this summer in fact next week I am heading on vacation to Washington DC and that is a five and a half hour plane ride so I'm gonna be listening to a new title personally I'm a huge fan of their self-help section and I'm gonna be checking out barking up the wrong tree by Erik Barker it's the surprising science behind why everything you know about success is mostly wrong but audible has a huge library of pretty much any type of book that you can imagine self-help romance Science and Technology fiction and the best part about audible is every single month you get credit for a free book that is yours to keep regardless of price right now if you sign up for audible using my link in the description below that's audible.com slash Jays two cents you get a free audiobook and a 30-day free trial and if you happen to be an Amazon Prime member and sign up in the month of July you get three months for the price of one swear you guys waiting for head to audible.com slash Jays two cents or just text Jay's two cents to five hundred 500 okay so huge thanks to alpha cool for sending me of these radiators both of these are I believe s t 30 there are 30 mil thick rads they're the same thin density they're the exact same core the only difference here obviously is the end tanks and the way that the fluid flows now for you to understand what we're testing here basically a cross flow radiator you can see all the fluid goes in one side it goes through all the different rows at the same time and then exits on the opposite side so it makes one pass through the radiator where a dual pass radiator which you see right here which is what like 95 percent or more of the radiators on the market are enter in one fitting they go through half of the radiator they make a 90-degree turn down here at the end of the radiator and go back the other way and then exit so basically the fluid is only actually running through half the rat at one time in either direction and so basically if you took this radiator split it down the middle and stretched it out that's what the cross flow on it would look like so theoretically what you're going to get here is also two different pressure drops this would have a lot less pressure buildup in the radiator because you have way more flow whereas this is going to have a little bit more pressure but the fluid is going to spend a little more time in the radiator so the true test here is whether or not having half the flow rate but twice the time spent in the radiator versus twice the flow rate and half the time theoretically I don't think the math is linear like that but pretty close we're gonna see if there's any sort of differences but first we've got to actually fill these rads and that's the best part about having quick disconnects like this is you can easily just change out components and stuff now one of the things we're gonna be testing here is not just CPU with my 8700 k we're also gonna hook the Poseidon up to it and see how it does when we actually saturate the radiator I don't think either the Poseidon or the CPU on its own is going to exceed the thermal capacity of either of these two setups so that's why we're gonna try both independently and then we're gonna put it all together as one loop and we're gonna see how well it actually does and then maybe we'll put both radiators together and see if it makes a daring the temps down even more that's we'll see how that goes but now we're just gonna fill up this rad nice and easy that's the best part about having these quick disconnects as you can see just how easy it is to fill it's nice see you can easily get all of our air out of there so we're just gonna do this now for all of my components which is gonna make it really easy for me to obviously switch out these parts for these tests okay so we're gonna start off with our baseline test that's gonna be with these standard cross flow or not cross flow but dual pass radiator that we're all used to I'm also using two Corsair SP 120 quiet Edition fans which are max at 1200 rpm they are running 100% because we are testing the full cooling capability and thermal capacity of these radiators in their current configs I'm also running just the 8700 K in the loop right now we'll add the GPU to it in a moment we're gonna let the temperature and the fluid temp equalize over here using OCC T medium data sets on our sit 8700 K that is technically not overclocked but it does have a sink all cores going which means all cores are running at the turbo clock not just the the two cores that are being tasked with the core whatever the most intense threat is so it's a slight overclock just in that all the cores are allowed to ramp up so we're gonna let the temperature kind of equalize see however long that takes and then we're gonna hook up the GPU to it and that will be our baseline with just the standard type of radiator now I usually will recommend a single 120 per component if you just want water cooling and you're not planning overclocking you want for the sake of being quiet that's why you also see GPUs will ship with the a iOS attached with a single 120 read because four GPUs - that's just more than enough so having a 240 on here is kind of the upper limit of where I would push the thermal capacity of radiators so that's one of the reasons why we're doing this test - so if we do both CPU and GPU on one radiator and then we get a significantly different result on another type of radiator that's the same size with the same components well then we can draw our conclusions from that so that is our methodology we're gonna let the temperatures do their thing and we'll come back when we do our switch all right so it's been running for just under 20 minutes if you look at the max temps right here these are the spikes every now and then if you take a look at the chart right there see how that just spiked up really high and came right back down these are those spikes and the isn't really indicative of the the total experience I mean you can see mostly these are in the upper 80s one core is in the low 81 C but all the way up to 89 C on one of the cores but if we look at the real time this is what we care about and just like I was expecting it's sitting anywhere in the 60s to the mid 70s and then our actual CPU socket is sitting at 72 C so these are the numbers we care about right here and it's been running long enough now for the loop to have equalized in fact the radiators not even that warm it's just because we do have more thermal capacity in that rad than what's actually making it out of the CPU and we talked about that how deleting and that's why people do it this is not ideally that CPU this is still very indicative of what buying one and just putting in a PC would be like it's one of the reasons why I happen I do not deal it my stuff when I do these tests because then that doesn't really tell you the whole story so we're gonna do right now is we're gonna add the GPU to the loop and we're gonna see what the max GPU temp is gonna be I'm expecting it to probably be in the mid to upper 40s possibly even the low 50s I'm not entirely sure this is a Poseidon so it's not like your typical full cover block it is a full block on here but it's not like an ek water block or anything like that which is usually gonna be a little bit better with the reason why we're using the Poseidon it's the only way we're gonna be able to do a direct apples-to-apples comparison because if we don't have it hooked up into the loop like if we took one of my just full water-cooled cards then we'd be switching GPUs back and forth all day long and I think if we're just using one set up that doesn't change it gives us a better example of what to expect now I'm gonna try and actually do this with it running I'm wondering if I can do this fast enough okay here we go and turn back on oh and never even got past like the 40s okay well now the GPU is in the loop you can see it all flowing yeah so quick disconnects all right so look at this right here you see all this crazy up-and-down something ran in the background for a second there but we're back to normal 47 C is where we kept out on the you flow by a double pass whatever radiator you want to call it I mean it's pretty standard rad and remember our CPU was at high 60s low 70s so now we're gonna run the exact same test on the cross flow I think it just hit 48 right now so I'm gonna go ahead and just let this coolant come back down though I'm gonna turn this off I'm gonna let it cool off and my predictions I really do not think anything is gonna change I think we were gonna get the exact same results and I kind of hope I'm wrong but that's my prediction I think we're gonna get the same results yeah something else worth pointing out though is we stayed well below the temperature threshold where the fans on the Poseidon will actually turn on so everything cooling wise was down specifically to the radiator all right now we can switch it been running for 20 minutes and I gotta tell you it looks pretty much the same actually if you look at this I'm seeing more 60s and 70s if I recall maybe Phil can put up a side-by-side but this appears to be maybe just a couple of degrees lower but if we look at the spikes in temp so one of the cores did actually hit 90 and I think the spikes might be overall slightly higher but this is not enough for us to actually be able to draw a conclusion does cross flow cool better or worse than a standard double pass radiator so you know the routine we got to put it under load with the GPU we know that graphics cards will saturate and have much more focused heat because the block is in direct contact with the GPU die we're talking way more wattage 250 plus Watts on this graphics card versus about a hundred watts or so on the CPU so that's what really makes these tests more beneficial to do with a graphics card so again I'm gonna try and do this with it running so that's the end that gonna be unaffected this is the out and I need to turn off the pump that would have been bad you were hoping you were gonna let me do it okay go go I'm getting good at this they need to be eight there's be a competition for this so you can do this faster and better it's tough same drill as before heaven benchmark for K 8x MSAA it's been running now it's not going up any higher and we are at 47 see the exact same clock we're at before a hundred percent on the GPU and here is the cross flow radiator so you know I think here here's the deal maybe a 120 radiator might show a slight difference I don't know I don't even know if they make a cross flow 120 if you wanna know the truth but here is kind of my takeaway from this you cut these end tanks off the core between both of these radiators is identical they are the exact same core which is ultimately what's going to be giving us our thermal capacity of the loop now this being within margin of error the exact same number as this one tells me that the nice thing about the Crossville radiator is you have an option if I were doing a small form-factor build there are times I would love a cross-flow radiator because the radiator itself becomes the relocating of a fitting so you don't have a tube going across the case to bring it into another component or to your rat or we're not your add but to your pump or your reservoir or whatever I would love to use this in small form-factor the only caveat to that is if you look you have a much smaller end tank on the side of the standard 240 versus the cross flow these both stick out the approximate thickness of where the fitting is which could then kind of count be counterproductive and the whole concept of using it in a cross flow or a small form-factor case now my theory on why this is I think has been kind of proven here is that yes we are actually spending less time in the radiator because it's flowing through much more quickly but you have much less pressure drop which means that the actual flow rate is increased so if you flow through the radiator less per pass but you get more passes per minute it's still the same so that's that's my theory as to why this doesn't show any difference so the reason why we did this video is when I asked alpha cool if there was any thermal difference to this or any temperature difference they went we actually don't know why don't you test that for us so that's why we did this so guys thanks for watching summer is one of those times I love to do a lot of cooling videos and since I've inspired so many people to water cool I want to get as much information out there as I can so if you have a suggestion for a video that we should do regarding summertime temps and keeping your system in check put it in the comments below or better yet tweet it to me at J's two cents on Twitter guys thanks for watching and as always we will see you in the next one like I can't even find a pixel like okay be running best attempt again I mean what
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