HD4870: Lower Core Clock?

[Eppikk]

I just received my HD4870 (Sapphire) and noticed the following:

The core clock readings @ GPUz and Catalyst control center say its running @ 500Mhz, tough the slider says its running at 750mhz. I tried lowering the speed to 500, raising it to 760 but the reading wouldnt change!

So is this just a lack of drivers (there arnt any drivers available at the ATI website for the 4xxx series)

Pic:

http://i179.photobucket.com/albums/w313/eppikk/4870.jpg


In GPUz sometimes it shows those weird values too, and some folks at HWbot have used them in their submissions :D, tough it shows 500 when i turn it on

[knopflerbruce]

10000% core OC, go for it!!:D

On topic:

Try to run 3dmark06, and then lower the core clock by something like 100mhz, and then try 06 again. If the score is quite a bit lower now, the n at least the actual core clock is changing.:)

[philbrown23]

ati cards have an idling feature to reduce gpu stress, kinda like intel speedstep. when you are not running 3d apps, it will reduce clock/mem speed and core voltage.

[Eppikk]

ati cards have an idling feature to reduce gpu stress, kinda like intel speedstep. when you are not running 3d apps, it will reduce clock/mem speed and core voltage.

Yep just checked it out, ran the Test Custom clocks part and it changed to my preset value.

BTW anyway I can turn this off?