Hey I recently bought a ibuypower.com pc with an i7 4770k @ 3.5ghz processor and a asus z87-k mobo and have been learning how to overclock it off youtube guides and stuff and have ran into an issue.
I learned that above average models can oc to 4.8ghz at 1.25v, average models 4.4-4.6ghz at 1.25v and that the 'dud' models less than 4.3ghz. I cannot get anything above 4.2ghz to run prime95 for more than 15 minutes. My cpu is currently at 4.2ghz at 1.25v and has been running prime95 for the last half hour no issues with a max temp of 66c. Do I just have a bad processor or is there ways to tweak my bios so that I can run stable at higher clock speeds (4.4+). I have a liquid cooling system so heat is not an issue.
I should probably note the I only changed the vcore to 1.25 and the multiplier to 42 in the bios menu.
My old i7 had a similar issue. Unfortunately I cannot assist you for I upgraded recently to another processor.
However, it should be noted that there aren't just "good" and "dud" i7's. There are many different varieties due to the method in which the chips are created. IIRC it has something to do with the silicon and the small impurities that are for some reason more common in i7's.
Good luck nonetheless.
It's just the silicon lottery, I'm guessing you lucked out in this case.
I'm stuck in the nearly same boat with my 4670k. I wanted to hit 5ghz, but Haswell really just can't unless you stagger the cores. I had to crank my voltage up to 1.34 to get it stable at 4.5ghz. What I learned is that Haswell needs alot more voltage to go a little bit higher. Don't be afraid to crank it up to 1.4v. Here's the main guide I followed: [url]http://linustechtips.com/main/topic/41234-intel-haswell-4670k-4770k-overclocking-guide/[/url]
Oh don't use P95, it isn't set up for Haswell's instruction sets, use Intel Extreme Tuning Utility (XTU) instead. P95 runs the risk of overvolting where as XTU just sticks with what you have set and stresses it.
One of the problems with Ivy Bridge and Haswell is that Intel started using shit thermal paste between the IHS and the dies instead of using solder. The thermal paste is often also applied poorly, which causes the cores to operate at much higher temperatures than they otherwise would.
If you're adventuresome, you can try de-lidding your CPU and redoing the thermal paste with something much better like AS or that metallic TIM. Though doing this voids your warranty and is risky in that you can easily damage your CPU if you screw up. You can buy some old Intel processors to practice on beforehand to better educate yourself on the process.
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I suggest the Pentium E2140 for practice. I've ordered in 11 for just over 20 bucks and it has made me far more confident in delidding my 4670k
Check your Load-Line Calibration setting. On some motherboards, you might even have to set it to its maximum setting so that your voltage doesn't droop down during stress testing - you can use CPU-Z to check your voltage in real time as you test.
The max speed I can seem to get it to stable is 4.2ghz at 1.25v, but I seem to lose performance if I do speed the clock up (slightly slower boot times, slower application loadup etc.)
Raise the voltage. 1.25v is not very high.
1.25 is pretty damn high for a 4.2ghz clock. I can hit 4.4 at 1.15v
[QUOTE=smookems;44593978]The max speed I can seem to get it to stable is 4.2ghz at 1.25v, but I seem to lose performance if I do speed the clock up (slightly slower boot times, slower application loadup etc.)[/QUOTE]
Likely, you got unlucky. I'm in the same boat. I can only get to 4.2GHz at 1.21. Any higher and it becomes unstable, and the higher voltages make the processor damn hot even with p95.
Crank it up to 1.4v. If you read pretty much anywhere online, Haswell needs high voltage for any kind of "highish" overclock. And again, don't use P95.
If I get anywhere near 1.4, my CPU will probably explode. And oh yeah, I forgot about the XTU. Thanks.
[QUOTE=waxrock;44617554]If I get anywhere near 1.4, my CPU will probably explode. And oh yeah, I forgot about the XTU. Thanks.[/QUOTE]
Yep, no problem. If you have some kind of aftermarket cooling, you will be fine. 1.5v is when Haswell gets sketchy, but again 1.4v is safe. I'm at 1.35v at 4.5GHz on a 4670k. The i5's don't need as much voltage, but regardless, they still need alot. I had it at 1.45v for 5GHz, but it just couldn't get stable. Haswell is a annoying CPU to overclock.
Well I'm at 87deg C with 1.3v core voltage and 4.3GHz. So there's that.
I think I'll have a go at reseating it whenever I get enough free time.
[editline]22nd April 2014[/editline]
I'm using the 212evo so maybe that has something to do with it.
[QUOTE=waxrock;44617762]Well I'm at 87deg C with 1.3v core voltage and 4.3GHz. So there's that.
I think I'll have a go at reseating it whenever I get enough free time.
[editline]22nd April 2014[/editline]
I'm using the 212evo so maybe that has something to do with it.[/QUOTE]
Oh wow, I probably wouldn't push it anymore because of the temps. I'm on a full watercooling loop, so I'm like ~60C max with a OC'd GTX 770 in BF4.
Wow, those are some pretty high voltages. Granted, I have to bump it to 1.23 for a 4.5 OC, but even then I'm hitting 70C during stability testing with a 212 EVO. Do you guys really have to push stuff to 1.4v?
Apparently. I think I just unlocky in the CPU lottery.
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