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Intel Kaby Lake-X: Core i7-7740X & Core i5-7640X, aka 'Krappy Lake'

2017-07-07
now earlier this year when we were getting all giddy Verizon I know I was grinning from ear to ear like a buffoon rumors started to surface regarding a counter from Intel we knew that Rison was going to offer six core and eight core CPUs for the mainstream and it was unlikely that Intel's existing quad cores would be able to compete admittedly though the 7600 K and 7700 K do still quite mighty at least for gaming but their time in the Sun is no doubt limited anyway the rumored processors were from the KB Lake excellent up and they were none too exciting the Core i5 or 7640 X looked to be pretty much a renamed 7600 K while the core i7 7740 X was pretty much a renamed 7700 K these new x-series processes were a bit confusing it would suggest that the 76 40 X could possibly inherit hyper-threading support essentially making it a core i7 and the 77 40 X could be upgraded with six cause those upgrades didn't seem particularly likely to me though but it also didn't seem likely the Intel would simply just released their existing mainstream CPUs on their high-end desktop platform after all what would that achieve and how does it anyway be accounted arisin well that's exactly what they've done repackage the KB Lake 7600 K and 7700 K as K be like X parts and call it a day on paper you'll see that the KB like X parts come with a very mild factory overclock and Sport a higher TDP rating as a result pricing remains the same though overall cost is dramatically increased thanks to the more expensive X 299 platform it's hard to imagine why anyone would spend twice as much on the next $2.99 board so these quad-core CPUs when they could simply get all the same features and capabilities in a z2 70 board for half the price not only that but half the features don't actually work on the external boards when using KB like X CPUs as they lack the required amount of PCI Express Lanes and only support dual channel memory anyway all this mess aside for now how does the core i5 70 640 X and core i7 7740 X perform and are they faster than the mainstream KB Lake options well let's go find out as I just mentioned the KB like xcp you still only feature a dual channel memory controller unlike the sky like X parts such as the 7800 X which do boast quad channel memory support what this means is we see the same 31 gigabytes per second of memory bandwidth we're running ddr4 3200 as we did with the 7700 K and 7600 okay moving on we have the Cinebench r15 results and well I can't say the numbers here are at all surprising that said despite their slight frequency advantage the 77 40 X and 70 640 X are both only able to match the scores of their LGA 1151 versions at this point we pretty much know everything we need to know but what the hell live runner heat more benchmarks we might as well check them out admittedly there are some slightly interesting numbers here anyway take the 7-zip figures for example the 77 40 X does manage to pull ahead of the 77 ok though the same can't be said for the 76 40 X versus the 7600 K this time the 77 40 X was only able to match the 7700 our Excel test while the 76 40 X actually falls behind the 7600 K moving to the PC mark 10 essentials benchmark the older mainstream K V Lake parts provide the best results here narrowly outscoring the newer KB like X models so this is a very disappointing results for Intel's new high-end performance quad core processors again the 7700 K and 7600 K were able to outscore the 77 40 X and 70 640 X this time by a quite convincing margin in the productivity tests something very odd is going on here the 77 40 X n 70 640 X were much slower for the photo editing test not sure what's going on here these results don't really make sense but I can assure you I did double-check them finally the last PC mark 10 tests and this time we're looking at video editing performance and here the older KB Lake CPUs again knock after 7740 X and 70 640 X though only by slim margin this term the corona benchmark also favors of 77k and 7600 K by a slim margin we also see the same thing in the blender chest the 77 okay in 7600 K were clearly faster I ran this test three times on each CPU after a full system reset each time and the LGA 1151 C you's came out on top each time again we see much the same in ham break the 7700 K and 7740 Axl much the same though the 7600 K did pull ahead of the 76 40 X the last application we're going to look at is Premiere Pro CC and again the mainstream cable ache parts delivered the best results we saw have the 77 40 X and 70 640 X struggled in the application tests and here we see much the same in our first gaming benchmark using battlefield one the 7700 K was 5% faster than the 77 40 X when looking at the minimum frame rate that's a decent margin much the same were seen when comparing the core i5 CPUs again this time when testing with mafia 3 we see that the main stream core i7 and core i5 CPU is provide the best results the hitman performance is very similar and the kb lakes and kb lake cpus traded blows here the same is true for ashes of the singularity as performance was much the same on either platform now if you thought kb lake x looked pretty ordinary so far things are about to get a lot worse for no added performance in fact more often than not we saw a reasonable decline in performance the cabe you like X CPUs consume between 15 and 20% more power under load in our excel test perhaps were still at idle X to 99 platform can be thing consuming almost 20% more power at idle that's just horrible but wait there's more terrible news for would be kb lake expires here we see under extended periods of load the 7740 x and 7640 x consume over 40% more power what ok let's wrap up this mess ok so going into this review we already knew that kb lake x wasn't really going to be any good in fact quite the opposite this was mostly down at the fact that these quad-core CPUs really have no place on the high-end desktop platform no less 1 they can't actually fully drive however adding insult to injury is the weaker performance and increased power consumption the performance issues could easily be blamed on the X 299 board that we used after all the motherboard manufacturers do seem as though they're being used as a bit of a scapegoat for this messy release by Intel that said though the asrock X 299 Taichi that we used was absolutely flawless when testing the higher-end 7800 x78 20x and 7900 X CPUs even so I did a bit of looking around to see what others found the slightly weaker performance seems to be a platform issue of other reviewers using a varying range of hardware found the same mixed results as me with Kb like X being slower for the most part the confusing power consumption figures that I found certainly haven't been seen by all in fact private clock has found the 77 40 X to consume 15 percent less power than the 7700 K when comparing total system consumption they use the Isuzu prime X 299 deluxe motherboard for those wondering meanwhile LAN OC found the 7777 40 X to consume roughly the same amount of power under load though adalah 77 40 X was 16 percent hungrier and again they use the asustor prime external 9 deluxe so already two reviews that are quite conflicted then lastly I'll mention the vault has review which found similar numbers to me under load the 77 40 X system ate up 35 percent more power than the 77 ok and they use the gigabyte or SX 299 gaming 3 so blame it on Kb like X the rush platform in general or perhaps just the different testing methods used by reviewers anyway we all seem to agree that overall kb lake X is actually slower than kb lake and that's obviously very bad in the end the core i7 77 40 X and Core i5 76 40 X make absolutely no sense I can't think of one good reason why they exist honestly what was Intel thinking wrapping things up I'll quote myself from my intel core exercises AMD thread ripper video published at the start of Computex perhaps even more puzzling is the 240 dollar core i5 77 40 X which is another quad core part that lacks hyper threading support so just four threads are on offer here so for $20 more than the Rison 5 1600 Intel's giving us a traditional Core i5 I won't bother reading out the specs for this one I'm pretty sure it's going to be a waste of your time kind of like another core i3 73 50 K situation I'll pretty much simply tell you guys don't buy it and here we are 5 weeks later and I'm telling you guys not to buy KB like X CPU who saw that coming anyway I'm glad to have this one out of the way and off my chest I'm done with it I'm not going to bother overclocking these chips deleting them or anything like that they simply shouldn't exist you shouldn't buy them and so that information really shouldn't be relevant next up for the core x-series I do plan to compare the core i7 7700 head-to-head with the six core Core i7 700 X to see if it's worth spending that little bit extra on the more high-end part and of course you do get those extra cores and for that comparison I will be comparing them overclocked as well as stock and when it comes to the value aspect I will be taking the entire platform cost into consideration for that battle after that I'll be updating my rising gaming results and comparing them with the equivalent Intel CPUs so stay tuned for that also if you liked the video please take a moment at the like button that really helps us out and subscribe if you haven't already and hit that little notification bell so you will be notified of our videos as they go live I'm your host Steve see you soon guys
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