The only thing that was a dud here was Intel's marketing of the 4790K. I've seen no evidence at all that it can clock higher than a 4770K, and for both, 4.7GHz is above average.
The only think that Devil's Canyon has going for it is lower temps, but that doesn't necessarily mean higher overclocks.
And I hear the L3 batches are real duds and run hot as well. The beefier input caps they put on the CPU didn't do much in the way of overclocking either... so I kept my trusty ol' 4770k.
Next time I grab my hands on a stock 4ghz CPU I will probably quit overclocking unless 5ghz is guaranteed.
I would not run Prime 95 version 28.5, it will throttle your CPU at +4.5ghz clocks.
I would not run Prime 95 version 28.5, it will throttle your CPU at +4.5ghz clocks.
is that a feature or bug in 28.5?
Honestly, I used to run my uncore high and you really don't need to. It can create unneeded extra heat and stability issues. Plus if you are running a cache voltage of over 1.3 you can run the risk of damaging the CPU. I backed off mine and set it at 3.7ghz at 1.08v. If you read the Haswell guide on OCN it provides a ton of useful information regarding uncore and voltages.
For the 2% performance increase with a high uncore (cache voltage, or ring voltage it is also called depending on mobo brand) you will see you are at a much higher risk for degradation and stability issues down the road.
If you want to use Prime95 use the older 27.9 version.
At idle my temps are bouncing between 27 and 35 C with a 24C ambient. AC is on. Under 100% load at 4.7GHz/1.315V it will get up to 85-90C during OCCT, but these are temperature spikes that happen momentarily when fans spin down. Generally I get about 80C during OCCT/x264 with fans at full speed and about 85-90C during Prime95 small FFT. I've also played some Borderlands 2 on the iGPU to kill some time, and temps never exceeded 75C, even with the iGPU overclocked to 1600MHz with 1.2V.tolis626, what temps are you seeing on your 4790? The cores on mine are down around 30 at idle (not overclocking), but it does get pretty warn under load. I'll have to update the high when I am back at my PC tonight, but I wanted to ask you before I forgot.
Ketchup and Tolis, what batches did you guys get?
Thanks tolis626. Just got her put together a couple days ago (only the CPU, motherboard, and RAM were upgraded) and haven't overclocked yet. I will probably do one run just to see what she will do.
Idle temps today are 24-24-26-24. Load temps are 68-69-66-61. This is while running the latest 3DMark a couple times. I was actually surprised, my 2500k with the same cooler was hitting 60 at load, so I was glad to see this one isn't getting too[/] much hotter.
Rvenger, I didn't think to look at the stepping, sorry. If I need to take the EVO off for some reason, I will look.
Here are some basically stock readings. Turbos to 4.4 on all cores under load. 1.160 voltage, tops out at 91c on prime small ffts. 75F ambient. The most intense game I run right now is Skyrim with RealVision ENB and 65 other mods. Maxes out the GPU but the CPU temps are 40 to 50C. Idles at around 30C, + - 2. L329C241. Wanted a beast at stock and I think I'm pretty close.
First off, may I ask what your WC loop consists of? 80C does seem kinda high for a custom loop, but not everyone likes overkill. Although, now that I think of it, 80C for 4.8GHz at 1.35V isn't bad at all.I had my i7-4790K delidded as well and it did drop temperatures significantly (using CLU). I can now run it at 4,8 GHz Core @ 1,35 V and Cache at 4,6 GHz. Temperatures go no higher then 80 degrees Celsius in my custom Water loop in it's "quiet mode" (fans and pump at low speed).
I was hoping for 5,0 GHz but even above 1,45 V I could not get it stable and that was reaching a point where I would feel really uncomfortable ;-)
I do think the sweet spot is/was at 4,6 GHz though but a 200 MHz overclock didn't feel like much.
A few things I noticed:
1. Devil Canyon needs a lot less input Voltage. Mine currently runs at 1.7 V
2. There is no obvious difference between override and adaptive voltage. Both still idle at the same amount and both are stable when you use the the same voltage. The difference is in the details: AVX2/FMA3 is using more voltage at full load. If you are running Prime 28.5 you probably fare better using adaptive. If you are using the older prime versions to get your chip stable and just don't care about AVX2/FMA3 you might as well use the override voltage and you can probably even save 0.07 V. I also checked with Handbrake which uses AVX2/FMA3 and it still is stable; Prime 28.5 is therefore applying an unreal load.
3. The new TIM is somewhat better, delidding is still king.
4. This is probably obvious: I needed to increase Voltage to the Cache to get it stable again after I increased the core clock. Sometimes lowering the Cache is preferable to get higher Core Clocks (Core is King ;-) )
I don't even care what Prime95 does to temps, because Haswell automatically increases the voltage when prime95/IBT are used by .1V but that never happens in real world apps. Ever. Obviously when voltage increases by .1V, yeah, temps will be bad.
My real world temps even at their most demanding, with near 100% threads in use, are 20-25C lower than prime95. But prime95 will shoot straight to 90C thanks to the auto increase in voltage. Even though prime95 is generally stable despite the high temps, screw it. I haven't used Prime95 for some time as a stress test and my system has been rock solid. Aida 64 for stress testing has worked great and playing crysis 3 and doing real world apps for hours on end has shown the system stable.
It's pulling almost 200W under load in Prime, so the temperatures in my loop are fine, water is at 32 degrees. There is only so much you can do, if you can't transport the heat fast enough put of the silicon. Bare die might be a solution though.
That being said I'm pretty happy with my Devil Canyon and the ASRock Extreme9. Just waiting for new GPUs and a NVMe M.2 SSD to come out ;-)
Here are some basically stock readings. Turbos to 4.4 on all cores under load. 1.160 voltage, tops out at 91c on prime small ffts. 75F ambient. The most intense game I run right now is Skyrim with RealVision ENB and 65 other mods. Maxes out the GPU but the CPU temps are 40 to 50C. Idles at around 30C, + - 2. L329C241. Wanted a beast at stock and I think I'm pretty close.
The stock all-core turbo frequency is 4.2 GHz on the 4790k.
http://www.intel.com/support/processors/corei7/sb/CS-032279.htm