8600m GT Overclocking impossible

[HippoGlouton]

Hi,

I have a 8600m GT 512Mb (DDR2) on my MSI GX 700 and the 3D mode default frequencies are 475/950/400(800DDR).

I ve seen on different forums including this one, people overclocking their 8600m GT and obtain a substential gain in FPS so i decided to to the same.

I have been trying with riva tuner, then powerstrip, then ntune, then AtiTools with different set of drivers, and according to these software configuration I face two cases:

-either the new frequency I set is not taken into account at all and the card runs in 3D mode with the defaut frequencies I mentioned above;

-or it is taken into account but only for a short period of time, and then gets to "throttle" mode with 275/550/200(400DDR) so it is even worse as games get very slow. (i need to reboot to get things normal again)

I don't think i've been setting too high frequencies as I tried sets like 550/1100/450 and for the short period of time it was working (a minute or two) the game was running smoother with between 5 and 10 FPS gain (very roughly on team fortress 2).

And I dont think there is a problem of heat i the temperature are around 60°C and i'm using a cooling pad (Zalman, the one with lot of little holes).

Any idea ? thx :)

[wook]

if the system/ game suddenly drops frame rate, then you have set the core and mem speed too high.

(Thats the driver being unresponsive)

You need to find what your system can run at. so tune it down by 5 each time until it becomes stable. remember DDR2 is not as capable as DDR3. so people with the same chipset (8600GT) but with DDR3 can overclock it a lot more.

Hope this helps.

if the system/ game suddenly drops frame rate, then you have set the core and mem speed too high.

(Thats the driver being unresponsive)

You need to find what your system can run at. so tune it down by 5 each time until it becomes stable. remember DDR2 is not as capable as DDR3. so people with the same chipset (8600GT) but with DDR3 can overclock it a lot more.

Hope this helps.

** Also.. the mem is what increases the frame rates. So overclock that higher than the core.

[HippoGlouton]

Hi,

it seems you were perfectly right, i managed to increase the frequency preceeding little by little, i'm now at 520/435 (instead of 450/400) and it appears to be stable, i was probably too demanding by directly starting with 450 for memory. (i guess even two DDR2 models can have quite different results)

Thx a lot :)