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Politics : Formerly About Advanced Micro Devices
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To: Brian Hutcheson who wrote (42079)11/23/1998 3:14:00 PM
From: Petz  Read Replies (1) of 1582886
 
Brian, re: CXT core
chiptech.com =general info and links, includes info that future K6-2's will all be CXT's (98/11/22, 11:14pm). An AMD spokesman says that the L3 cache on a K6-3 (i.e., the standard 512K OR 1024K L2 cache on a socket 7 motherboard) does improve performance significantly.

first.tsukuba.ac.jp =overclockability, K6-2-300 CXT regularly oc's to 400 etc. (can't read this -- Japanese)

anandtech.com =promises a review of K6-2-400 this week, this should allow is to assess how much improvement the new core makes.

amd.com - this is the data sheet for the 400 MHz CPU

p.110 latest stepping remaps 2X multiplier to 6X. This will be more important for K6-3 since 66 MHz x 6 will be plenty fast.
p.119 makes it clear that the write combining feature improves performance by eliminating stalls due to uncompleted writes
p.215 starts the 6 page description of the "Write Merge Buffer", a.k.a. write combining, feature. Merging multiple write cycles into a single write cycle reduces processor bus utilization and processor stalls, thereby increasing the overall system performance.

The write allocation feature has also been improved and various address registers widened.

I believe power dissipation was also lowered. Extrapolating the power dissipation for the 300 MHz mobile K6 vs. a normal K6, it appears that typical power dissipation at 350 MHz for the CXT K6-2 will be only 8.5 watts, assuming that mobile version of the K6-2 will run at the same voltage as the mobile K6.

Petz
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