• Competitor rules

    Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.

8800GTX overclocking quick question?

andybenn

andybenn

andybenn

Associate
Joined
4 Apr 2008
Posts
166
Overclocked my 2 880GTX's (riva tuner)

from 575mhz core
1350mhz shader
1800mhz memory

to (45-50 + on each value)

620mhz core
1395mhz shade
1900mhz mem

small increase to start with! temps run at 66 c load (using 3d mark 06)

what other things should I use to check stability? and if ATI tool with that 3d furry cube thingy, then how long for? and should I scan for artifacts or let it rotate? gets real hot doing that for a while though (high 70's at normal clock speeds)

please just a little guidance, Many thanks
 
your shader is too low. I am pretty sure you can go over 1500 with riva tuner (you can clock only the shader with riva tuner); I can game for hours at 1620 with my one.
 
Last edited:
desperate bump!

please point me in right direction? searched high and low and still cant find a straight frward aswer for stability and safe temps
 
Use the Hardware Monitoring facility in Rivatuner as you increase the clocks on the card. You will find that increasing the clock by 1mhz does not translate to a genuine clock increase of 1mhz. The core and shaders increase in sometimes 20+mhz stages. If you clock the core too high the 3DMark will lock up. Shaders too high may cause flickering or missing textures. Memory too high, i found will cause little black squares to appear on textures. Get Rivatuner to run your fan at 100% too! Help get those temps down a bit. I used 3DMark 06 to max my clocks and it is game stable now. My card tops out at 648core 1513shaders and i use 2050mem. Could push mem a bit but borked my last gtx from pushing clocks too high. Hope that helps a bit.
 
Last edited:
BAMBI said:
LOL

A good stability check is any of the 3Dmark benchmarks they stress the card pretty good. If it passes that it will play any game.
Click to expand...


funny you should say that but had my card upto 621/1500/2000 and it ran 3dmark06 for 5 goes of the trot not 1 freeze then start to play quake and after 15 mins the game froze so tried COD4 and after 25mins it did the same now im with you i would have thought if it was going to go it would be under 3dmark06
 
To stress GPU's i normally stick 3dmark on the higest res possible with maximum aa and af, that'll usually fall over if there's something wrong with the clocks... stock settings don't really tax gfx cards these days...
 
I use the ozone3d fur benchmark to heat up my card (select stress testing in a window and let in run a couple of minutes before starting to try and overclock)and have the ATI tool 3d window open to check for glitches/errors (.scan for artifacts settings)

I find I can have what I thought was a stable overclock after 15 minutes of no errors in ATI tools but with the fur benchmark running in the background then the same clocks fall over in under a minute. Be warned that if you think ATI tools got your card toasty then you haven't seen anything yet!

Using this method, if you are stable after 5 minutes in ATI tools then you will be stable in games/3dmark06 24/7 as you will never, ever put as much strain on your graphics card than running those two together. Hence some people set their overclock higher is it will still probably stable in games/3dmark ( I can run 3dmark at 850/2300/2100 on my GTS G92 but it will fall over with the above method/or in games)

Some people don't stop overclocking until errors show in ATI tools. Personally I stop and back off a few Mhz once yellow dots appear even if ATI tools still says no errors. I find that you are boardline instable there and that is not where I want to be. Personal choice.

Overclock using rivatuner leaving the core and shaders linked at first. Once you have maxxed out, unlink them and see if you can get your shaders higher on their own.

Finally once you have your max core and shaders you can try upping the memory but memory overclock has the least gain in fps compared to the other two which is why you do that last.

Oh and finally, set your fan to 100% (noisy I know but your are trying to find your max level) if too loud, then set it to what you are comfortable with but you won't get as high an overclock.
 
My shop computers gtx's are running 625/2000/1775 @ 62 degrees maxed out but i put matching Zalman vf1000's on them .

Before the Zalmans they always ran hot as hell in the 70-78 degree range when ever i clocked them up .

Zalman vf1000 ***

In my experiance , 3d mark 05/06 is not a good stability test of the videos cards and its not untill you get in your favorite game will you ever find whats best .

I use 3d mark for setting cpu voltage and mhz but the games dictate the gpu clocks imo .
 
Last edited:
You must log in or register to reply here.
Back
Top Bottom