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Politics : Formerly About Advanced Micro Devices
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To: Ali Chen who wrote (60340)6/3/1999 4:20:00 AM
From: Tenchusatsu  Read Replies (4) of 1571166
 
Some interesting tidbits regarding the benefits of moving to PC66 to PC100:

www4.tomshardware.com
www4.tomshardware.com
www4.tomshardware.com
www4.tomshardware.com

I looked at Tom's trusty CPU benchmarks again, and I saw that he also ran some tests on a Celeron 400 which wasn't multiplier locked. He ran that Celeron both on a 100 MHz bus (4x multiplier) and on a 66 MHz bus (6x multiplier). Comparing these two configurations can provide us a good look into the benefits associated with increasing the bus speed from 66 MHz to 100 MHz.

First of all, the bad news. For a Celeron running at 400 MHz, going from PC66 to PC100 SDRAM provides a 1.9% improvement in Business Winstone 99 under Windows 98, and a 6.7% improvement in the same benchmark under Windows NT. That's it for a 50% increase in SDRAM speed.

Now the good news. Highend Winstone 99 did better, a full 15.0% improvement. And Dragon's Naturally Speaking 3.52 showed a whopping 23.3% improvement! It seems to me that these two benchmarks are highly dependent on memory bandwidth.

Now why do I bring this up? I bring this up so that we can predict what performance benefits might come from a transition from PC100 to PC133 SDRAM. Going from PC66 to PC100 is a 50% increase in memory bandwidth, but going from PC100 to PC133 is only a 33% increase. Obviously, there should be only miniscule improvements in Business Winstone 99, significant improvements in memory-intensive tasks like Highend Winstone 99 or Naturally Speaking, and almost no improvement in games since they're even less memory-intensive than Business Winstone.

Pretty complicated picture, no?

Tenchusatsu
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