becuase the cpu goes idle waiting for vgas..this "lapse" while cpu is idle, then loaded, leaves spurts of traffic over the pci-e bus, causing stutter as data from the cpu slows the data flowing in the card out to monitor.Originally Posted by Luka_Aveiro
Luka, just check out the slide pics in this very thread about microstutter...it's shown there too.
this is not the only cause of microstutter, but it's definately an issue.
Phenom isn't too bad...it could use 3.2-3.4ghz and a slightly faster bus. Core2 @ 3.0-3.2 400mhz FSB or higher is ideal.
Remember boys, I'ver got dual 3870x2's...I'm dealing with the issue on a daily basis. I've almost completely eliminated the problem...some apps are more prone to it than others though.
It's a problem with memory control...within the vga. vga gets data from cpu, it must buffer the data...no data, it works only on data available, and will use as much of the ringbus as possible.
Cpu sends some data down....it goes on the ringbus too...but now it interferes with rendering as the dispatch controller must deal with pixels in flight, and pixels data incoming.
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