20 vs 21x multi on i7

[setter]

Im currently running my i7 920 DO at 193 x 21,4050 mhz, obviously this leaves my ram running below rated speed of 1600mhz, (ocz reaper, currently at 1547 mhz, 7-7-7-24, 1.64v). Im thinking of disabling turbo and running 20 x 200 bclk. Below is my current settings for 21 x 193.

I believe ill have to tweak qpi voltage, (ignore 1.300 in pic, currently at 1.312500), and up the dram bus voltage from its current 1.64v, i believe 1.66v is safe enough on i7, board is an asus p6t deluxe v2. Appreciate any advice/opinions. Thanks in advance.

 

[bifday2k]

I don't think you would really have to change any volts really at all.

I use 200 x 20 and my stuff is as follows

Vcore 1.272v (load) 1.2875 (bios) Can use lower and be stable for everything, need that volts for full stablity when folding.

Qpi 1.3v (again can use lower but upped it, for folding stability)

Dram is 1.65v (used to be 1.64 before i updated bios that allowed use of 1.65), 1.64 was more then stable at 1600mhz, but as i was now able to choose 1.65 i decided too.

Basicly setter, enter the new bclk and multi, with your current volts and what not, and test it, id be surprised if u had to change voltages, ofcourse with the new bclk u will lose 50mhz from ur clock, but will gain more from the memory.

 

[minicle]

My experience echo's what bifday2k has said really.

In that I am running the same m/b and chip as you, my ram is different although rated the same speed. (See sig) Rig is quite happy running the ram at 1.64, the trawling/reading around I have done indicates 1.66 is fine irrc.

I will have a look and see if I can find any screenshots of my bios, should have something on my mobile.

 

[twist3d0n3]

are you using LLC? i'm not a need a little more vcore than that for 4GHz