8800GTS Over clocking Issues

[-Hotplate-]

Hello,

I have been delighted with my OCuk 8800GTS 320MB GFX Card, and i have been experimenting with OCing it. But despite very promising beginnings it is proving unstable and i have to keep winding it back to almost stock speeds now!

I got the card to 650/ 980 initially, but after playing for a while the card crashes my PC. This can take 2 hours or 20 mins. But the time its taking is reducing, and despite winding the card back, its now only at 550/850 and it keeps crashing.

It runs fine on Stock, which is 513/ 792. I used nTune initially but thats a load of pants now, and wont work at all.
Riva Tuner I find hard to use, so i am using ATI Tool Version 0.26 and that is excellent. It finds max core at 664 and max memory at 980.

But it wont run in game at anything like those speeds now.

Anyone got any ideas? I thinking that Stock is best?
I have tried to mirror BFG Cards (550/800) but that doesnt seem to last either.

I must be doing something wrong?

 

[WarBird]

try putting up your fan speed and see if it's more stable

 

[-Hotplate-]

try putting up your fan speed and see if it's more stable

Actually I have just done that with nTune at alls well so far. ATI Tool doesnt detect the gfx temps according to the logs.

Its a pity nTune is so badly written.

 

[queamin]

ntune is crap it wasn't stable for me rivatune is what i use, if i was you i would look into rivatune and do a search on the web as they will have guilds with photo's not used atitools for ages,i got a desk fan which is loud so my fan on 80 to 90% in 3d mode.
It might be worth reinstalling your drivers as you don't know what ntune done to them.

 

[queamin]

Actually I have just done that with nTune at alls well so far. ATI Tool doesnt detect the gfx temps according to the logs.

Its a pity nTune is so badly written.

Good,try 3dmark06 as if unstable i normaly crashes.

 

[555BUK]

What is your PSU? You may be bushing it far when the GC is overclocked.

 

[-Hotplate-]

What is your PSU? You may be bushing it far when the GC is overclocked.

Nah I dont think so, I have Opteron 165. It can handle it easy.

Its a temperature issue. The fan speed isnt going up automatically.
I have wacked it up to full with GPU on 620/1900 and its stable at 71C for well over an hour now.

Getting 90 -170 fps on COD 4 demo everything maxed.

I would like to learn how to use Riva Tuner though.

 

[C64]

http://home.comcast.net/~boogieman1954/8800 fan speed guide.htm