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Technology Stocks : Advanced Micro Devices - Moderated (AMD)
AMD 191.50-4.5%1:53 PM EST
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To: fyodor_ who wrote (74934)3/19/2002 10:50:18 AM
From: Ali ChenRead Replies (1) of 275872
 
"The conclusion that quantiherz (using the current forumla)"

And exactly what the current formula is?

"The change in fps from each successive addition of 100 quantiherz is, and should be, a monotonically decreasing function"

That's right. However: Each "successive addition"
changes the CPU core frequency in less and less
diminished steps (in %%-wise); therefore the difference
between consecutive scores should not drop faster than
it started at 1500+, which was 0.1/step. Yet the Dp
dropped by 0.3 and 0.2 during steps to 1900+ and 2000+.
Therefore we can safely conclude that those 1900 and 2000
scores are at fault, and not the 2100.

Actually, no matter how funny it sounds, but the ability
of P4 to "scale better" is a direct consequence of it's
lower IPC. Just think of a processor that can do zillions
of Instructions per Clock. Until it hits a cache miss and
stalls waiting for data from memory. Then it runs whatever
available instructions are in almost no time (remember,
it can do zillions!), until next stall. In this case
(assuming the memory/FSB still runs at the same frequency),
the change in df will make almost no difference in
performance, so your dP/df will be zero.
So, "low dP/df" = "high IPC".

Take care,

- Ali
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