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Politics : Formerly About Advanced Micro Devices
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To: Petz who wrote (37013)9/14/1998 3:58:00 AM
From: Tenchusatsu  Read Replies (1) of 1570745
 
3)the K6-3 L2 cache of 256K will experience 30% more L2 cache "misses" than the 512K cache of the typical Super Socket 7 motherboard.

Actually, according to Microprocessor Report, the general rule of thumb is that if you double the cache size, you reduce the cache miss rate by the square root of 2. So a better estimation would be that the 256K cache would experience 41% more L2 cache misses than a 512K cache. This is just a nitpick.

4)the penalty for an L2 cache "miss" will be 20% lower than with the K6-2, because 50% of these L2 cache misses will be satisfied by the L3 cache on the Socket 7 motherboard.

That's pretty unlikely as well. The principle of locality will be covered by the on-die 256K L2 cache of the AMD K6-3. In other words, any L2 cache miss is likely going to be so random that there won't be very many L3 cache hits on the motherboard unless the L3 cache was very large.

Or, here's another way of putting it. The AMD K6-3 has 32K+32K of L1 cache and a 256K on-die L2 cache. The factor between the cache levels is four. How in the world is the L3 cache on the motherboard going to make any difference unless its size was increased to at least 1 MB?

Of course, this is another nitpick as well. All AMD has to do is recommend that the K6-3 be installed on motherboards with at least 1 MB of L3 cache. An extra 512K of L3 cache should cost only $45.

The bottom line, a K6-2-400 will just equal a P2-350, but a K6-3-400 will equal a P2-500 while a K6-3-450 will definitely outclass it.

Pretty interesting prediction. You think that the K6-3 will be ahead of the K6-2 by three speed grades, and ahead of the Pentium II by two speed grades. I predict that the K6-3 will be ahead of the Pentium II by only one speed grade; i.e. a K6-3 450 MHz should perform just as well as a Pentium II 500 MHz. That still should worry Intel, if AMD can deliver on-time.

Tenchusatsu
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