Adding more voltage to Lynfield.

[Will Robinson]

Hi guys,having a small overclock problem and would like some opinions.
I usually run my sig CPU at 3.8GHz but backed it off for summer to a bit over 3GHz as ambient temps were pretty high.
I'm getting BSODs occasionally now when overclocking back to anything around 3.5GHz or higher.
I've been using the Gigabyte Smart 6 utility for quick OC and it won't boot at 3.8GHz now.
Should I add some voltage at this point to try and get back up there or is there something I may have missed?
It used to run rock steady at 3.8GHz via the S6 utility.
BCLK is at 150MHz.x22 for 3.3GHz CPU frequency.

All help appreciated.:thumbsup:

 

[Saylick]

Did you change anything from your last overclock?

Assuming no, what's your VTT and VCC?

 

[Will Robinson]

I don't recall changing anything...just used to Smart 6 utility to drop back to 3.15Ghz(nonturbo) then when I tried to go back up to 3.8Ghz using the same utility the system crashes via BSOD or boot fail with OC fail warning.

Current settings:QPI VTT=1.100v(auto)

CPU Vcore=1.26250v(auto)

 

[BallaTheFeared]

What code is windows spitting?

126? 101?

 

[Saylick]

What's your QPI frequency? If you want to aim for a 3.8 GHz OC, you are probably raising the QPI frequency as well, which also needs a higher voltage to maintain stability, i.e. VTT.

I used to run a 200 BCLK which would periodically BSOD using a VTT of 1.15V but ran stable with a VTT of 1.17V. I am currently running my 750 at 167 BCLK and a VTT of 1.15V. Since you'd ideally want to use a BCLK of 160 (160 x 22 = 3520 MHz), I'd start by manually raising the VTT to 1.15V and see where that goes.

 

[Will Robinson]

Ok..raised VTT to 1.15v and it boots at 160x22 for 3520Mhz.
Ran Super pi and it completed a 2M run so i'll try a bit of gaming later on tonight.
Thanks(provisionally)for the help...I may be back...:$