GPU OC capped at 405mhz after successful OC to 585mhz

Right. What the title says.

Downloaded and installed MSI Afterburner, and I've been playing with it all day. Managed to OC to 585/1404/900, ran Kombuster for a while to test, then launched a game. At some point during the game I experienced a massive drop in performance, so alt-tabbed and saw the GPU at 405mhz. Did some research, and suspected the GPU was being throttled due to temp issues - no problem, exit game, let things cool down for a bit and try again.

But now it seems the clock is locked at 405mhz. Oh noes!

Any suggestions?

 

It does that after the GPU crashes. You have to reboot to reset everything.

 

Awesome. Rebooting solved the issue. Thx.

 

Yep this is down to the driver essentially hanging (or crashing) due to instability (not enough voltage to sustain that overclock). It is not a heat issue generally (at least it never has been in my experience).

Think of it like a blue sceen or system hang when a cpu overclock is unstable.

I have found that Metro 2033 is fine at 585/1404/1760 but crashes at 585/1404/1800 (odd as memory instability wouldn't normal cause such a crash... ), Crysis on the other hand shows massive artifacts if I push the memory past 1740.

 

Funny you should mention temperature, because the logs show it only went up to 57C. Is there a rule of thumb when overclocking CPU and memory together? Like keeping it 1:1?

 

If you mean GPU then I don't think there is a rule of thumb that you have to overclock one with the other (or at least not one that could be applied to all GPU's).

The 335m is generally memory bandwidth starved so if you overclock the core/shaders you definately want to give the memory as much boost as possible (otherwise you will make the bottleneck worse).