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Should I make a push to 5GHz on Air w/ i5 6600k?

post #1 of 16
Thread Starter 
Hello all,

Man its been some time since i've posted here but I really, really lucked out and got one of the best Intel CPU's out of the batch.

I'm currently at 4.8GHz stable @ 1.34 volts. I tried 1.32 and passed every test except Battlefield 1 would crash randomly, bumping to 1.34 has seems to solve the issue. I've seen the charts regarding i5 6600k OC's and most people to get to 5GHz they have to de-lid and run water cooling. I'm just running a Cooler Master Evo 212 as shown in the picture below. I have two 140mm intake fans and two 120mm exhaust fans running at a slightly higher RPM to compensate for the smaller size so i have equal airflow.

I kid you not, here are the results of my temps running CPU-Z at 4.8GHz:



Here is a test of Cinebench at the same freq:




So what do you guys think.. Should make the push to 5GHZ? I'd imagine with the temp's i'm seeing now, i'd probably be in the low to mid 70's C around 1.4+ vCore judging just on how great the CPU is handling the OC thus far.

PC Specs:
CPU: Intel Core i5 6600k Skylake CPU @ 4.80GHz 1.34 vcore
Cooler: Coolermaster 212 Cooler
Case: NZXT S340 case
Motherboad: Gigabyte GA-Z170XP-SLI w/ latest BIOS
RAM: 4x Geil Potenza 8GB RAM
HDD: Toshiba 1TB HDD
GPU: AMD Radeon RX470 Reference Card
Case Fans: 2x Corsair White 120mm fans (exhaust)
2x NZXT 140mm White 140mm fans (intake)
PSU: Corsair 650W Full Modular PSU

Case Picture:

Edited by yue0707 - 4/30/17 at 6:04pm
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post #2 of 16
Thread Starter 
Currently at 5.0GHz at 1.45vcore on air. Windows boots.. Testing w/CPUz bench. The CPU lid is still on, temps while benching are at 69C.
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Lucky Bastard
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post #3 of 16
Thread Starter 
BSOD during bench at 1.45 vcore. Dont worry about the chip dying. I make tons of money. I just am curious to see if I can set a record on air stable without delidding (the temps imo are still well within range.. Pushing to 1.46, CPU fan at max, increasing voltage on intake fans and exhaust to 80%.
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Lucky Bastard
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post #4 of 16
Thread Starter 
Okay, well no luck at 5GHz. I was still crashing in cinebench at 1.52 vcore (max safe vcore for 6600k as listed by Intel) @ 85C. Dailed back the OC to 4.9GHz at 1.37 vcore. Testing failed. Upped vcore to 1.40 failed w/BSOD. Upping vcore to 1.42, cinebench crashed but not windows. Upping vcore to 1.435 (I'm pushing a little higher in increments but not too much to dial a safe voltage and undervolt from there since I know it can run safely at 1.52v without damage). Screen flashed at 1.435 volts, machine freezing. But Cinebench almost completed, BSOD temps at 74C before crash. Going to 1.45v (I feel like were closing in on the stable range). Cinebench completed at 1.45v, running @ 77C. Running Prime 95 version 29.1 for extended stability testing.
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post #5 of 16
Thread Starter 
Cinebench and CPU-Z Benchmark results @ 4.9GHz 1.45 vcore

Cinebench:


CPU-Z Compared to stock i7 7700k:


CPU-Z Compared to stock i5 6600k:


CPU-Z Compared to stock i7 6700k:
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Lucky Bastard
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post #6 of 16
Thread Starter 
HOT HOT HOT!!!

Prime 95 testing w/Maximum heat and CPU Usage. CPU is not throttling. Still within CPU safety threshold for temps, but barely hanging in there 90C i'm surprised did not throttle the CPU. So this 6600k i'm assuming can take quite a beating, what a great and tough CPU Intel has made. I haven't seen a processor endure such temps since the Pentium 4HT OC I did a long, long time ago. Although i'm reading through the stress.txt and although the errors reported aren't fatal to system stability, applications may be crashed as a result. I will most likely dial back to 4.8GHz due to what Prime95 believes is excessive heat or running at the bare redline of what the CPU will throttle at, usually creating errors that Prime95 will pick up on, but isn't fatal to system stability. So i'll make the switch to water cooling soon and delid the CPU to see if I can push for the 5GHz goal. But honestly its not bad for what I paid for. I bought this CPU on sale at microcenter for $145 and it comes near and close to i7 performance. What a steal!

Edited by yue0707 - 4/30/17 at 8:25pm
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Lucky Bastard
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post #7 of 16
If you have the money (since you're not worried about having to buy another CPU) you may consider buying a better cooling solution. That may allow you to get that extra but or of the CPU. Maybe a swiftech 240mm kit or something? Or EK
https://www.ekwb.com/shop/ek-xlc-predator-240

Oh and if you haven't may I recommend getting the ITP? 15-20$ gets you a new CPU if you destroy it even if overclocking
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post #8 of 16
Thread Starter 
Yeah I already have the overclocking insurance. Ill run to Microcenter tomorrow to get a water cooling solution (the biggest radiator I can get). Then we'll see how it goes. I'm very limited in terms of quelling silent errors that Prime95 has picked up on. Back down to 4.7GHz @1.34 vcore and the errors went away. Heat back down below 78C.
Lucky Bastard
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Lucky Bastard
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post #9 of 16
Thread Starter 
I was just curious how for you can push an OC on a Hyper 212. I know the internet says 4.7 max but I wanted to see for myself. I think that extra heat might of ruined the efficency of my thermal paste. Ive noticed temps at idle are now higher than what they were before going to 1.52vcore. But at least at 4.7 all the Prime burn in tests are passing with flying colors. Ill look into that cooler you mentioned. Looks really, really beefy.
Edited by yue0707 - 4/30/17 at 8:49pm
Lucky Bastard
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Lucky Bastard
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post #10 of 16
Thread Starter 
Okay folks, i've backed off. Back down to below what i was running before (4.7 @ 1.30v) down to 4.5 @ 1.3v. I haven't used Prime95 in a while but its latest version does a really good job at detecting hidden faults that would cause a game to crash (like battlefield 1). So i ran it at 4.5 1.3v and no errors reported. So i am going to upgrade to a water cooling solution and not de-lid (not allowed by intel OC warranty). See how for she'll go. But just know that the usual range i've tested the Hyper 212 at is around 4.5 to 4.7GHz for the i5 6600K. Performance is still good and I haven't lost any FPS in games and they are no longer crashing. So like many other postings, just let this be a reference if you are running a similar setup and keep in mind some Intel chips are trash at OC'ing and some are beast at OC'ing. My G3258 i used to have was absolute garbage at overclocking. I had to pump a ton a voltage in just to get a 400-500MHz OC that everyone seems to achieve at around stock voltage.
Lucky Bastard
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Lucky Bastard
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Hard DriveCoolingOSMonitor
1TB Toshiba Coolermaster Hyper 212 Evo Windows 10 x64 Samsung 24' 
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