stupid question?

right, trying to see how low the voltage will go before moving on.

running 425 x 8 @ DDR2-1065 4:5

currently at 1.45V under load and so far so good + temps max 65C
 
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1.43v under load seems to be working well at that speed ^^

temps are looking a little less insane too!! :D

Not tried going any lower yet due to lack of time. Is it worth it to keep going lower? find that sweet spot? or push onwards and upwards?
 
i would post a screeny for you but i'm away again for this weekend. 1.43v under load seemed to cope fine with small FFTs and blend so i imagine we could even go a little lower.

i'm tempted to go for 3.6 when i get back but i'm not sure if the temps are going to go out of control. unless there's something else limiting it and causing it to fail. vNB is 1.47 btw.

with 3.4ghz running at 1.43v under load @ 63C, does 3.6GHz look possible??

Either way, so far we've eeked another 0.1GHz out of the processor and 200MHz out of the RAM. Even that has increased the average FPS in FSX by 5! (which makes a huge difference in FSX)!!!
 
so is it worth playing with all of the voltages above? see if we get any joy?

I'm back home tonight so i'm going to try the push to 3.6, (windows open and ski-jacket on)! Looking forward to seeing what we can get out of it :)

I think i'll leave the VNB as it is for the time being and try reducing it if we get anywhere near stable.

Like you say, it would be a shame to not reach our target even if it cannot be left like that for long. I'd certainly be very happy with that achievement and I've learnt so much already!

To pick up on Plec's point, I've been looking around online at lapping and it doesn't look too hard. What are the risks? and will it make much of a difference to the temps?
 
right... went for 3.6 (400x8 ddr2-1000) kept failing prime small FFTs so racked the vcore up to 1.54 under load. temps are pushing 85c and it's still failing. don't think i can push the vcore any further :( vnb is at 1.44v
 
Like your chicken-egg analogy. Shows why forums like this exist, this certainly isn’t easy!

Unfortunately it’s not possible to have 1 particular voltage on auto. If you want to manually change a voltage then the rest have to be on manual as well. Bit of a pain

I did what you said and increased the the VTT from 1.30v to 1.35v (highest it will go with VNB at 1.37v)

Prime blend ran for a whole 25 minutes before bluescreening although temps only reached 65C (not as bad as i had expected)
Small FFTs ran for 30seconds before an error occurred (also the temps rocketed!)

Best result so far lol!

Also ran FSX for an hour or so and it seemed to work fine...

Here are the details: (please let me know if you’d like me to include any more in future)

FSB: 400
Multi: 9
Mem: 1:1 (DDR2-800)
Vcore (bios): 1.6250v
Vcore (load-actual): 1.540v-1.550v
VTT: 1.35v
VNB: 1.37v
Temps Idle: 40, 38, 37, 37
Temps load (PrimeBlend): 65, 65, 64, 64

Do you reckon pump some more Vcore?
 
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