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Improving lemon 7700k OC?

Dangerous_Dave

Dangerous_Dave

Dangerous_Dave

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Joined
21 Sep 2010
Posts
455
I have a 7700k which is struggling to hit 4.8GHz at 1.35V (which I gather makes it a bit of a lemon). It is almost Prime95 stable but not quite. What might be the best settings to change to try and make it solid? I'm using an MSI Z270 Gaming M3, AX850 PSU, 16GB 3000MHz Patriot RAM.
 
Does it NEED to be Prime95 stable?
I mean if it is stable under your normal use. Surely that's all that matters?

Prime95 is unrealistically savage anyway. Is it AIDA64 stable? That is my go to stability program. Seems more realistic than Prime.
 
What cooling are you using? 1.4v is the max for these isn't it? Up the volts a notch if temps allow? Or start with max, see what you can stabilise speed wise then go for the lowest volts you can achieve it at.
 
beany_bot said:
Does it NEED to be Prime95 stable?
I mean if it is stable under your normal use. Surely that's all that matters?

Prime95 is unrealistically savage anyway. Is it AIDA64 stable? That is my go to stability program. Seems more realistic than Prime.
Click to expand...

Quite honestly, I disagree with this. If it aint Prime stable (Intel Burn Test is better for this), then it simply is not stable. At some point, be it weeks or months down the line, you will get random crashes creeping in. In my experience anyway.
 
djbully said:
Quite honestly, I disagree with this. If it aint Prime stable (Intel Burn Test is better for this), then it simply is not stable. At some point, be it weeks or months down the line, you will get random crashes creeping in. In my experience anyway.
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I agree with you, but the general consensus is as beany_bot has explained, even 8 pack takes this stance. I guess it depends what you use the PC for and how reliable you need it. I can't see the extra X mhz being worth any potential for instability.
 
Depends how anal you are (I don't mean that as an insult). My PC will crash on prime95 after about 4-6 hours. On the tests I have done on this overclock.

I have ran this overclock for 3 years now I think? Maybe more. And NEVER has it crashed on me. In any situation.

So I'm calling BS on the fact it needs to be prime95 stable to be stable. 3 years of stability proves that to me. I can run Aida64 till the cows come home and it won't crash.

No way am I going to downclock it just to satisfy prime95 when it means nothing to me in the real world.
 
Dangerous_Dave said:
I have a 7700k which is struggling to hit 4.8GHz at 1.35V (which I gather makes it a bit of a lemon). It is almost Prime95 stable but not quite. What might be the best settings to change to try and make it solid? I'm using an MSI Z270 Gaming M3, AX850 PSU, 16GB 3000MHz Patriot RAM.
Click to expand...

Firstly the latest versions of prime 95 can push things very hard like people have said a lot of people still use the old 26.6 with either mixed or Small FFT's.

Eitherway there is a lot of factor's to take into account really presuming ram and so on are at stock or stable then i would usally say if it does not crash for 30 mins on prime 95 exit add a bump to vcore and you should be golden for along time!

But there is quite abit you can do tbh from having a better cooling solution aio or bigger metal cpu cooler to delidding the cpu and direct die mounting (if you have a kit for that or you can risk it :D ) or just remounting with metal tim between ihs and die and ihs and cooler (aslong as it is not alu based).

You can also make sure you are running the latest bios for your motherboard and getting really in depth put higher grade thermal pads on your vrms and better paste on chipset (or even active cooling) and so on.

It all helps and in the end (especially delidding) will help to lower your temps a lot and should make that overclock stable or even increase your oc at that current voltage! just depends how much you want to spend and how much effort you want to put in !

p.s delidding with the proper tools followed correctly is perfectly safe and other then voiding your warranty it should have no real effect on resale (aslong as you have the ihs and box/documents)
 
There is AVX code which you're not likely to find outside the benchmarks which stresses the cpu especially.

If your BIOS has a setting called AVX offset then enable it.

You set it to X hundred MHz below the overclock and when it detects AVX code it downclocks the CPU to that.

So if you set the AVX offset to -3 (hundred MHz) with the CPU overclocked to 5GHz the CPU will drop to 4.7GHz for the duration.

You fiddle with the offset and the overclock so that in regular use it is stable and when it is asked to run AVX code it drops the overclock so it again, is stable.

To ensure stability you test with a benchmark that uses AVX code and one which does not.
 
mattyfez said:
Haha!
In all seriousness, forget about prime, just use a suite of more normal benchmarks.

I only retired my overclocked Q6600 13 months ago, it literally never crashed in about 10 years unless I ran prime.
It's a pointless test that proves nothing imo.
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I was being serious. :D

If your not happy to go up in volts (some time more volts doesn't help regardless) then the thing to do is just lower the clock speed and enjoy the stability.
 
What is this nonsense? You wouldn't see people 10 years ago going "well it's not stable in X but it seems stable in games/whatever so it's fine". Standards have dropped, people! :D
 
DragonQ said:
What is this nonsense? You wouldn't see people 10 years ago going "well it's not stable in X but it seems stable in games/whatever so it's fine". Standards have dropped, people! :D
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That's because the AVX instruction set was only introduced in 2011, with Sandybridge. Before that, if it wasn't stress test stable, you'd most likely have a problem. Now, stress tests can and will stress your CPU in a way that you will never see in normal usage.
 
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