7800GT Max VMEM Voltage

U

UltimatePCFan

New member
Ok guys, just tickled the resistor with a bit of pencil, stock air, and yes i know its very risky i havnt yet got a multimeter :D

I wont go any futher now without one, and im just wondering what is a safe voltage typically to run upto on stock air?

Cheers.
 
name='Vrykyl' said:
you havent got a multimeter?? ok...now back away from the 7800 slowly....
Click to expand...

Lol yeah, put the pencil down, now get down on ur knees and put ur hands on ur head, the nice guys with the whit jackert are coming to help you :D

Seriously, if u aint got a multimeter, volt modding is the last thing you want to be doing - can get a decent one for under a tenner that will do the job nicely.

Mav
 
Yeh, dont worry ive backed off. I wont touch it anymore until i gte hold of this multimeter ill be getting ahold of from maplins.. So what is a safe voltage typically on stock air?
 
ok i think that is pretty damn high. im not that experienced but isnt it usually 2.1v stock and your still on the stock cooler :O
 
name='phil123' said:
ok i think that is pretty damn high. im not that experienced but isnt it usually 2.1v stock and your still on the stock cooler :O
Click to expand...

very true Bud. It is 2.08V to be exact at stock

so i supose 2.5V is a pretty large increase. :D I wotn go any futher until i know what others have gone to on stock. Although the temps of the card are still not massive. So im not that concerned**.
 
Too high. Try and get the pencil off.

The RAM temps arent measured, thats why the temps dont seem massive.
 
Alright, ill get to that now, as my clocks dont seem, to wanna go higher than before the VM now anyway :S unless it is a ram temp issue.
 
With good sufficient cooling I find that 2.55V is the sweet spot for video memory - it does vary though depending on what actual chips it's running. As long as the temps aren't high it should all run okay. Touch them, then you'll know how hot they are :p

Don't do anything without a DVM, it's just not worth it - you can pick one up that'll do the job for around a fiver, unless you want to go pro and splash out on a calibrated Fluke :)
 
Thanks for the advice guys, ive just got all of the graphite off, and the voltage was down to its stock level again, ill take it back upto about 2.3 i think, as if 2.55V is ok on sufficent cooling then i really should as im on stock air. Cheers.

:D i dont think any damage has been done. :). BTW, i got a multimeter from maplins today, was £19.95, i was the fluke beasts, but as this is going to be the only main use im not going to spend so much. Seems quite nice so far, its got pc software and stuff which is a nice feature aswell.
 
**** sorry!!! I should of wrote 2.389V!! What a typo! :rolleyes::)

Funny that i accidentally said i was on 3.3V on air.. or anything for that matter.
 
What temps are you getting? I'm quite a nutter when it comes to overclocking, so I don't actually have a limit - just watch the temperatures, and as long as you keep them in check you should be fine! ;)
 
Regardless if cooling the max should be 2.5v - on air 2.4 should yield sustainable results fro ya in regards fo clock speed on the RAM.

Cheers

Mav
 
Cheers Mav & Stocky,

As regards to stocky i think ill give just watching the temps! As im not such a nutter! ;)the temps dont seem to have risen a hell of alot, so i suspect before i got unbearable with them the card would pop its clogs.

Mav, The voltage now is 2.389, i may go a little higher like you say to 2.4V, but will i be able to clock much futher on such a small increase? Clocks are still as above.

PS: I want to mod the core, but 1. i need to get a soldering iron, 2. im on a rubbish 3500 so alot of the benchmarking results will be heaviliy affected by it i guess.
 
Increasing the voltage does allow higher speeds and with good airflow it will help stabilise higher memory frequencys.

If you don't want to increase the voltage much, you can just tweak it slightly to remove any artifacts at the higher speeds.
 
name='phil123' said:
is the modding making any difference to your memory clocks?
Click to expand...

Yes mate,

but i only use top out settings for benchmarking, settinsg before vmod were 472/1295, now they are 472/1380. Seems that 3DMARK05 is alot less memory bandwidth sensitive than i thought. :@

Seems the core is the largest factor in 05, and i cant go any higher than 472. :( - I really need to mod the core/get it modded.
 
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