I finally bought a sapphire 7850. Soon I'll post some screen-shots in order to enter the club, but first I wanted to stabilize my overclock.
There are a number of quirks happening.
I used 'ASUS GPU Tweak' (v18.104.22.168) because it seams to be the only tool I can use that gives me higher then 1050/1450 core/memory frequency sliders
(I noticed that many here had the max core clock to 1050, so this is how to do it to get more: In 'ASUS GPU Tweak', you have to press a small 'Advanced Mode' button in the buttom left of the window, and then in Settings->Tunning you'll have the option 'Overclocking range enhancement').
It also has a voltage slider that has the max value 15mV higher than stock (my stock voltage is 1210mV) but the slider didn't seem to do anything, as the built-in monitor, and gpu-z reported the same voltage (so if anybody modified the voltage on a 7850, any help would be appreciated).
I've been using Kombustor 2.3 for stability testing and the other weird thing is that when I ran GPU Burn-in test on DirectX 11 with Post-FX, and after that I ran Kmark Stress Test the scene appeared yellow-tinted and with some vertical lines. First I mistook this for overclocking artifacts, but it seams to be consistent (if I first run the burn-in without the post-fx option, the yellow tint is fixed). Which test/option is better to run to ensure stability? right now i'm around 1120Mhz core clock and 1520 (x4 = 6080) memory and stress testing.
edit: In kombustor that is just non-intuitive interface, that tint is the post fx. It seems that the burn-in test is better for gpu-core stability testing, and the kmark stress test is better for memory (possibly because it uses more memory)
Another issue is with BOINC, when boinc-ing, the gpu load stays kind of low, high 70s, low 80s. These are probably driver issues that will be resolved with catalyst 12.4, as i've also seen that gpu load reporting is sometimes not working properly, and i'm not the only one: like here
(see afterburner shot)Edited by creisti86 - 4/24/12 at 4:15pm