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Technology Stocks : Advanced Micro Devices - Moderated (AMD)
AMD 252.09-0.3%Jan 29 3:59 PM EST
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To: Joe NYC who wrote (33267)3/24/2001 5:30:49 PM
From: andreas_wonischRead Replies (1) of 275872
 
Joe, Re: One thing I am wondering about if the CPU stops while the change in frequency is occuring, or if it continues to operate, in other words, is the CPU stalled for 200 ms, or is the 200 ms the time it takes to go from one state to another, while the CPU continues to operate?

I recall a program called SoftFSB from a Japanese which allowed you to change the FSB under Windows without a reboot. So at least changing the FSB should be possible without stalling the system. I don't how PowerNow changes the frequency (Fyo suggests a combination of multiplier and FSB), so I can only guess. But since the MPEG playback was very smooth, there are only three possibilities:

a) The stall is much smaller than 200ms.

b) The two demonstration movies were playing only at 10fps or so, so you couldn't notice any "jerkiness" because only 1 frame was dropped when changing.

c) The change takes up to 200ms but the CPU continues to operate when changing.

We'll probably find out in the middle of next quarter.

Andreas

PS: I hope desktop Palominos also have Power Now. You could use fans with temperature sensors and thus your PC would be very quiet unless there was some heavy workload.
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