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Subject: Re: Bus Speed V CPU Speed--?`

Author: Mike S.

Date: 09:30:15 08/06/02

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On August 06, 2002 at 10:08:00, Rex wrote:

>Do you receive better performance upgrading from a PC133Mhz bus speed to 333Mhz
>FSB -V- keeping the PC133 FSB and upgrading CPU 300 or so Mhz?
>
>Better performance meaning Chess Programs.

I did some Fritzmark tests with different FSB clock rates and/or* memory clock
rates, with an Athlon XP. The impact of memory clock speed has been max. 6%.
I've read from others, the impact of FSB speed & -settings can be up to (but not
more) than 10%, for chess performance.

*) I can choose mem clock asynchronous to FSB speed, i.e. FSB 133, mem 166.

Also, I have noticed that DDR266 (133 MHz) with *small* latency settings
provides better Fritzmarks than DDR333 (166 MHz) with *high* (longer) latency
settings. 166 MHz and small latencies were not running stable, unfortunately.

The CPU clock speed has *much* more impact on the chess performance. The speed
increase is virtually identical to the clock rate ratio (with *very small*
differences, depending on the program, position, hash size etc.).

Regards,
M.Scheidl



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