A few i7 clocking questions

setter

setter

setter

Caporegime
Joined
14 Dec 2005
Posts
28,067
Location
armoy, n. ireland
Ive been doing a bit of overclocking on my i7 920, so far im at a lowly 3.0ghz on the following settings.

Cpu ratio, auto
Turbo enabled
Bclk, 143
Dram, 1433mhz 7-7-7-24
uclk, 2866mhz
Qpi link data rate 5161mt/s
Cpu, 1.18v
PLL, 1.800v
Qpi/vtt volts, 1.21250
Dram, 1.64v
Speedstep/c1e disabled

Im looking to push a bit further and im wondering about the qpi link data rate setting, the guide im using suggests setting this to its lowest setting, if i push the bclk up will i have to adjust this. Also when i load up cpuz the memory tab shows my ram running 1T command rate, is it advisable to change this to 2T, ive only ever heard of ram running 1T on nvidia s775 boards. Thanks in advance.
 
Sorry mate, missed this.

QPI link and uclk I've set to the lowest ratios available. I'll try the qpi link higher once it's otherwise stable. The other one needs to be at twice the ram frequency or twice the frequency +1 depending on where you read. It will increase with bsck, but it'll still be at the lowest setting available. Stability is probably limited when you go over 4000 on the uclk,

Ram settings are hard to call. C7 is good, so it may well be capable of T1. I'd be inclined to knock it back to T2, C8 while clocking the cpu then work on improving the ram afterwards. This is a hangover from 775, where the process I used was working on the cpu with the ram set very gently, then working on the ram.

The less obvious things I've learnt are that lower pll can be useful, a few people are stable at 1.3V but not at 1.8V. Cpu voltage and qpi voltage seem to be about equal for me, struggling with reducing either.

Turbo is a tricky one. There's settings in the bios which stop turbo throttling, but I don't know which they are. Without them appropriately set, the ratio will drop to x20 under high velocity and high voltages. Its a form of speed step. As such I'm currently refusing to use it, I may come around later.
 
You can push your bclk right up with most stuff on 'auto' think i got to about 3.2ghz, then I set my uncore to double my memory speed,


CPU : 2.75
PLL : 1.8v
QPI: 1.35v
DRAM: 1.6v

Ram is running at 1528mhz @ 8:8:8:20 1T
 
You could actually get quite a bit higher than 3.2 just by changing the BLK. When i was learning this stuff i bumped the BLK up to 180 which gave me a 3.6 overclock and changed literally nothing else. Only thing that needed a change was the memory multiplier because as u increase the BLK, the memory mulitplier goes up with it, so it could push them into the 2k+'s so ul need to put it down to 6 (or 8 or 10) depending on the speed at which your Ram is rated to run at.

Note though that anything higher than a 3.6 is the time to start looking at other settings to keep things stable.
 
You must log in or register to reply here.
Back
Top Bottom