ganaz-x, i think it might be limited by ur CPU 5600+ at stock dun have enough omph i guess.......

SB600 is just lack of juice for OC, else it quite similar to sb700 rite?

coolice, u goin water cooling for ur 4850? nice, want to see how high can u go, i might do that too if this is good

mohamadfazli, what is ur PSU ?? i dun think is the VGA card is overheated as the limit is quite high, most likely ur psu working overtime and get too hot too........

ganaz-x, ur Silencer 750W is more then enough for 4870CF...... even with 4870x2 and a 4870, but quad fire i'm not sure, may be jsut enough too....

btw regarding ur fan profile, may be u have to do like the old 3870 method, u set for the 2nd card without crossfire enable first, then only start to crossfire