Quote Originally Posted by DefStar View Post
Ha ha, I wouldn't buy a Saphire card even if they were the only ones to make an R9 290x. Every Sapphire card I have had has been the worst overclocker.... And now somebody claims that every Sapphire card they have ever had was the best overclocker in the world.
Well, my experience is Sapphire NO!
no two chips clock the same. i have a 4850 that clocks to 750 and is rock solid stable. it is on a generic pcb, and from what i gather most 4850's, even with voltage adjustment availible cannot reach such speed. in other cases they can reach this speed, even surpass it. if you get a poor clocker, chances are that you are throttling on the gpu or pwm's, or even dare i say, a badly put together vBios. but one of the biggest impacts on getting a bad clocking chip.... is that it is actually a bad clocking chip.

tl;dr all chips clock differently. ymmv.