[gongo]

Why do they need to bump up the gpu clocks all the way up from idle...? It is irritating with ma 4870 1GB...the GDDR5 needs to clock up and down...resulting in screen flickers....i know the new 5 series GDDR5 controller is improved to the extend clocking up results in no flickering...but the point is....do we need the power to play Crysis to accelerate flash or IE9..? We go from totally (i guess almost is more appropriate) idle state of tera-a-flops to *almost* full utilization of tera-a-flops of gpu computing for compressed HD videos?

[Grall]

Eh, my 4890s don't downclock the RAM at all when idling. Are you running some kind of utility to provide that functionality?

GPU acceleration is becoming a bit of a bother right now I agree, since if you got a big gun of a vidcard it will most likely be fairly loud, and spew a lot of hot air if clocks get bumped up to full just because of a flash video or somesuch. Hardware acceleration needs more fine-grained control over the GPU.

This probably is beyond the capabilities of current hardware, I dunno how reactive the system is, if it can bump up the clock speed fast enough if workload increases without dropping frames and introducing stuttering...

[Vadi]

My 5750 doesn't change RAM speed when I use Overdrive or some other overclocking tool. (Unfortunately I often get the grey screen of death when I let it having lower the idle speed.)
According to its BIOS it has five clock/voltage states and other cards have ten for example. So you probably could use some other speed (provided that the card remains stable when underclocking in idle mode )?

[gongo]

I just use catalyst profile + hotkeys to downclock the GDDR5, simple as that?
(just that GPU acceleration bumps up the clock and flicker flicker!)

[Dave Baumann]

On an HD 4xxx GDDR5 card any memory clock changes will cause the flicker, hence the default are alway high for the memory clock. PowerPlay is GPU activity based so any activity that pushes it above the "idle" state (which is basially very little activity on the screen) will case a state change. If you set it back to its default state then you'll not havethe flicker.

[gongo]

Yea i know but the high clocked GDDR5 is the one thing that contributed to HD4800 high idle power drain, my thoughts are by downclocking it, i can decrease up to 50% power consumption! We still need fine grain gpu acceleration though...