5870 Bottleneck Investigation (CPU and/or Memory Bandwidth)

[saaya]

You guys are getting marginal increases in frame rates when bumping up the memory speeds from the decrease in GDDR5 memory timings, and you're confusing that with a memory bottleneck.

your saying that performance increases minimally because the mem timings get adjusted automatically to the higher memory speeds...

but what do you mean with people confuse that with a memory bottleneck?

a memory bottleneck indication would be if performance WOULD increase when ocing the memory, not when ocing memory barely does anything at all, like in this case...

and yes, the timings get adjusted automatically on ati cards, on nv cards as well afaik... but the increase in timings is not linear, so higher mem clocks still increase the bandwidth even though timings get increased.