Coolbits 'Detect Optimal Settings' not reliable?

[TheMightyTen]

I've got a 7800GT and the "Detect Optimal Settings" option in the Clock frequency settings tab consistently detects 481 core and 1.17 memory. If however I run the Mother Nature (I use this test because I have found it one of the best to show artifacts if you've gone to far) test in 3DMark2003 I get artifacts. The best I can get in this test without artifacts is core 470 but I can get the mem to 1.25??

Anybody else found something like this happening?

 

[TheMightyTen]

What do other people use to find artifacts, is there a better test than 3DMark03's Mother Nature?

 

[TheMightyTen]

something called rthdribl is good and no coolbits auto detect is not reliable, nor is atitool artifact test.

Cheers I'll give that a go. I do remember playing around with this some time ago but completely forgot about it