Need some OC advice -7600k

[lsstefan]

Hello.

I'm currently in the process of reaching the 5 GHz holy grail on a Z270 MSI SLI PLUS and 7600k.

I've reached a stable-ish 4.9GHz @ 1.33V. Stable-ish because I ran 3x20 Intel Burn tests and just a little Prime, so I can't say it's 100% stable. I'll do more tests once I settle to a value.

One core goes to 85-87* spikes in Prime, the rest are hovering at 80*. I tried some 5GHz testing, but voltage over 1.35 gets to a toasty  95* so I stopped. Gonna delid it and try again.

 

Now my issue comes from LLC. At 1.33Vcore, LLC2 = 1.396, LLC3 = 1.368, LLC4 = 1.344, LLC5 = 1.328. LLC5 crashes, 2 and 3 burn my CPU, 4 is the only one stable, but kinda high.

As I'm typing I did try lowering the Vcore by 0.01(to compensate for the LLC) and I got 1.336V with LLC4 and it crashed. So I'm guessing my CPU is not really stable at 1.33V, it's stable at 1.34+ because of the LLC?

Should I increase my Vcore or leave it like this and the LLC bumps it up so it doesn't crash?

 

CPU Ratio when AVX. Do I leave it on auto or lower it AFTER I've found a stable OC?

Does increasing BCLK to get lower Multiplier means I can lower the Vcore or will it yield lower temps? Like 125x40 instead of 100x50?

 

Thanks for the help.

Regards

 

PS: I've read a lot of Kaby/Skylake OC guides, but for example someone used LLC2 to get stable, while my LLC2 start a fire in the case...so I can't apply his experience to mine

[themctipers]

don't touch the BLCK, that messes with everything in your system, and you can't really get it past 110 or so

 

at 5GHz, I think AVX2 will kill your CPU, and some programs do use it, so you should lower it (iirc extreme overclockers need to lower AVX or else it would be unstable as shit)

[lsstefan]

1 minute ago, themctipers said:

don't touch the BLCK, that messes with everything in your system, and you can't really get it past 110 or so

 

at 5GHz, I think AVX2 will kill your CPU, and some programs do use it, so you should lower it (iirc extreme overclockers need to lower AVX or else it would be unstable as shit)

Thanks for the reply. During OC testing I should leave AVX on auto, right? Lower it after I find a good OC?

[themctipers]

Just now, lsstefan said:

Thanks for the reply. During OC testing I should leave AVX on auto, right? Lower it after I find a good OC?

you should lower it during testing because when testing with AVX, that'll lower your temps and you'll be using that daily with your overclock anyways

why scare yourself with a high temperature when using auto AVX when your ratio isn't auto and is set to something lower? 

 

[lsstefan]

Just now, themctipers said:

you should lower it during testing because when testing with AVX, that'll lower your temps and you'll be using that daily with your overclock anyways

why scare yourself with a high temperature when using auto AVX when your ratio isn't auto and is set to something lower? 

 

Fine by me, I like lower temps. 

I left it on auto because some suggested the system isn't stable with AVX lowered because some stress testing uses AVX, so if I test at 4.5GHz AVX while my regular is 4.9GHz, it's not stable for 4.9, it's stable for 4.5.

 

[themctipers]

Just now, lsstefan said:

Fine by me, I like lower temps. 

I left it on auto because some suggested the system isn't stable with AVX lowered because some stress testing uses AVX, so if I test at 4.5GHz AVX while my regular is 4.9GHz, it's not stable for 4.9, it's stable for 4.5.

 

yeah, but do you really want that high of an AVX (which increases the temps by a stupid amount iirc, thats why people don't use p95 anymore but im seeing a resurgence of people using that to stress test .. ) 

[lsstefan]

1 minute ago, themctipers said:

yeah, but do you really want that high of an AVX (which increases the temps by a stupid amount iirc, thats why people don't use p95 anymore but im seeing a resurgence of people using that to stress test .. ) 

I'm using P95 to find quick crashes. For example Intel Burn test passed 4 cores and P95 crashed 1 core after 2 seconds. I won't leave P95 for 24h.

After I'm done tweaking, I'll use IntelBurn, RealBench and AIDA to see if it's ok.

My confusion is this: the games I play don't use AVX(99% sure), but do use those 5GHz I'm aiming for. If I test AVX at 4.5GHz, will the system be stable at 4.9GHz without AVX also?

[themctipers]

3 minutes ago, lsstefan said:

I'm using P95 to find quick crashes. For example Intel Burn test passed 4 cores and P95 crashed 1 core after 2 seconds. I won't leave P95 for 24h.

After I'm done tweaking, I'll use IntelBurn, RealBench and AIDA to see if it's ok.

My confusion is this: the games I play don't use AVX(99% sure), but do use those 5GHz I'm aiming for. If I test AVX at 4.5GHz, will the system be stable at 4.9GHz without AVX also?

if AVX is at 4.5ghz and your CPU is at 4.9ghz, then it is stable

you've manually set AVX to only go up to 4.5GHz, it'll never go above that when doing AVX. 

[lsstefan]

Should I lower Vcore and get a more aggressive LLC? Or keep Vcore high and a lean LLC?

 

@themctipers or others.

 

Cheers.

[themctipers]

1 minute ago, lsstefan said:

Should I lower Vcore and get a more aggressive LLC? Or keep Vcore high and a lean LLC?

 

@themctipers or others.

 

Cheers.

don't know, i dont even know what LLC is. 

[lsstefan]

Just now, themctipers said:

don't know, i dont even know what LLC is. 

Load Line Calibration. The thing that raises Vcore to counter Vdroop.

I got it at 1.33V and LLC level 4 at 1.344V

Wondering if it's better to drop to let's say 1.3V and LLC level 3 and so on.

[themctipers]

Just now, lsstefan said:

Load Line Calibration. The thing that raises Vcore to counter Vdroop.

I got it at 1.33V and LLC level 4 at 1.344V

Wondering if it's better to drop to let's say 1.3V and LLC level 3 and so on.

i dont even know what vdroop is lol

just dont ask me for advice on overclocking  wait for someone else