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The i5-760 OC Club - Page 26

post #251 of 1922
Quote:
Originally Posted by Zippy476 View Post
What is the max vcore you can feed this thing? With High vdroop 1.387v (bios) is 1.304 load and it isn't enough for my OC. But with Low Vdroop 1.35v (Bios) is 1.392 (load) it is stable but seems high.

191x21
VTT 1.206
DRAM 1.65 7-9-7-24
PLL (auto) 1.8

thanks.
Depends on your temps really. I've seen validations at 1.6v but I wouldn't recomend it LOL. Safe and sane I'd keep it under 1.4v and temps under 80C.

The voltage difference you're looking at is quite a bit. LLC doesn't make the differnce in stability it is the voltage itself. Load voltage that is, doesn't matter what you put in BIOS it is the load voltage that counts. Personally I'd just leave LLC off and raise the voltage to what you need.

Vcore seems high and VTT seems low. Just my opinion but I'd bump the VTT up around 1.3v and see if that doesn't allow you to lower the vcore. Then go back and lower the VTT after getting the vcore you need.
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post #252 of 1922
Quote:
Originally Posted by ~sizzzle~ View Post
Depends on your temps really. I've seen validations at 1.6v but I wouldn't recomend it LOL. Safe and sane I'd keep it under 1.4v and temps under 80C.

The voltage difference you're looking at is quite a bit. LLC doesn't make the differnce in stability it is the voltage itself. Load voltage that is, doesn't matter what you put in BIOS it is the load voltage that counts. Personally I'd just leave LLC off and raise the voltage to what you need.

Vcore seems high and VTT seems low. Just my opinion but I'd bump the VTT up around 1.3v and see if that doesn't allow you to lower the vcore. Then go back and lower the VTT after getting the vcore you need.
Would LLC off be "high vdroop"?

Alright I will bump the VTT.
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post #253 of 1922
Quote:
Originally Posted by ~sizzzle~ View Post
Thought I'd also point out here that keeping the VTT and DRAM Voltage within .5v of each other is highly recomended. This doesn't get discussed all that much probably because it is a pretty big spread and keeping them within .5v is almost automatic. From alot of the overclocks I've seen on the 760's I could see it becoming a problem though as they can run very low VTT with moderate overclocks. Keep in mind also that it isn't all that uncommon for P55 boards to overvolt the DRAM Voltage from what is set in BIOS so staying within .4v might be even safer. This is not so much of a stability problem as it is a fry your CPU a few months down the road sort of problem.

Also on my system anyway and I believe it to be true of other P55/i5 systems the baseclock can be very VTT dependent especially over 200.
This guys. If I run Prime95 after several hours each core ends up on a different test. After six hours the spread is usually 2-6 jobs. I don't have any more pics but you can find them if you look. One core might be on problem 302 and another one is on 299 or whatever. Just be careful and I don't think I had that strong of a 760 to begin with, unless its my mother board that sucks.
post #254 of 1922
Low Vdroop - Fail
191x21
Vc 1.360 load
Vtt 1.303v
PLL 1.810
DRAM 1.65

Vdroop High - Fail
191x21
Vc 1.425 (Bios) 1.32 load
VTT 1.303
PLL 1.810
DRAm 1.65

High Vdroop - Pass
181x21
VC 1.232 load
VTT 1.206
PLL 1.810
DRAM 1.65

I give up. I am guessing either my mobo and proc sucks. I wanted 4.0 looks like I am stuck at 3.8 just like with my E8400 (E0).
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post #255 of 1922
Quote:
Originally Posted by Zippy476 View Post
Low Vdroop - Fail
191x21
Vc 1.360 load
Vtt 1.303v
PLL 1.810
DRAM 1.65

Vdroop High - Fail
191x21
Vc 1.425 (Bios) 1.32 load
VTT 1.303
PLL 1.810
DRAm 1.65

High Vdroop - Pass
181x21
VC 1.232 load
VTT 1.206
PLL 1.810
DRAM 1.65

I give up. I am guessing either my mobo and proc sucks. I wanted 4.0 looks like I am stuck at 3.8 just like with my E8400 (E0).
Why the huge gap from vCore setting BIOS to what CPU-Z says? Maybe you dont have vDroop on?
post #256 of 1922
Quote:
Originally Posted by Poisoner View Post
Why the huge gap from vCore setting BIOS to what CPU-Z says? Maybe you dont have vDroop on?
Well with MSI you get "High Vdroop" and "Low Vdroop". High does vdroop gives you huge gaps while low actually will increase your vcore.

So on high 1.35 gives me like 1.2xxxx while on low 1.35 gives me 1.39
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post #257 of 1922
Well set it to low vDroop. The voltage swing is probably what is killing you.
post #258 of 1922
Thread Starter 
Quote:
Originally Posted by Poisoner View Post
This guys. If I run Prime95 after several hours each core ends up on a different test. After six hours the spread is usually 2-6 jobs. I don't have any more pics but you can find them if you look. One core might be on problem 302 and another one is on 299 or whatever. Just be careful and I don't think I had that strong of a 760 to begin with, unless its my mother board that sucks.
I believe it is just normal the cores differ in the number of jobs they finished. Logically speaking, each core is unidentical from the other and receive different voltage/current thus producing varied core temps. One core is hotter than the other that will eventually result in varied performance. As long as you get no errors. It's fine.
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post #259 of 1922
Quote:
Originally Posted by Zippy476 View Post
Well with MSI you get "High Vdroop" and "Low Vdroop". High does vdroop gives you huge gaps while low actually will increase your vcore.

So on high 1.35 gives me like 1.2xxxx while on low 1.35 gives me 1.39
In fact try my settings from my validation on the first page. I have the second highest overclock and I did it on air with 1.4 vCore and 1.35 VTT.
post #260 of 1922
Quote:
Originally Posted by tjbridge View Post
I believe it is just normal the cores differ in the number of jobs they finished. Logically speaking, each core is unidentical from the other and receive different voltage/current thus producing varied core temps. One core is hotter than the other that will eventually result in varied performance. As long as you get no errors. It's fine.
Umm no, my AMD CPU was always on the same problem no matter what and so was my Intel CPU until I ran it at stock speeds for about a month with the IMC at the default 1.05v for my system and the ram I was using at the time at its default 1.65v. So your correction now stands corrected.
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