Originally Posted by Devildog83
I had it up to 1200 with a bit of added voltage, the stock RAM speed is 1600, so you think I should go under that?
No. I figured the stock RAM speed would be 1500, mainly only because every AMD GPU I've bought and many I've seen post R9 name change has come at 1500 tops.
Set the RAM speed to 1600, crank the volts and see if you can get it past 1200mhz on the core.
With my 380X, the RAM comes stock at 1500. I found out it can do 1600 no problem. However, it added a fraction of fps to Valley (like 0.3) and like 50 points to my total Fire Strike score. No point.
Valley is good for preliminary tests and for testing RAM speed. Usually if I go too far on the RAM I will black screen almost immediately in Valley, which requires a hard reset. However, Valley is pretty bad in general for testing overclocks as I've seen it be "stable" in Valley yet immediately crash in another game or in Fire Strike (e.g. this happened with my 270X at 1300mhz).
Fire Strike is a really good way to stress test, especially if you loop it. When I see artifacts in Fire Strike they are usually immediately apparent and they usually show up as blue flashes all over the screen.
With a 280X on air though, I'm willing to bet you won't do much past 1200mhz anyway for gaming. You never know though, you might get really lucky with the card and get one that can game at 1250 or something.