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Politics : Formerly About Advanced Micro Devices
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To: Scumbria who wrote (37042)9/15/1998 5:19:00 PM
From: Petz  Read Replies (1) of 1570710
 
Revised K6-3 performance predictions. Based on Ten..'s assumption
that a 256K cache experiences sqrt(2) more misses than a 512K cache,
here's the predicted performance of a K6-2-400 (two cases) and
K6-3-400 (three cases). The hardware assumed is the hardware in the
"Big CPU Shootout" at tomshardware.com. Also, I now accounted for bus
overclocking where applicable (SDRAM overclocking was already
accounted for.)

For the K6-3 on a 512K cache motherboard, the assumption was 25%
hits in the L3 cache. For the 1024K cache motherboard, 50%.

Again, I have assumed 5% core CPU improvement in the K6-3, which
translates into a 2% benchmark score improvement. The prediction
accuracy of the model over the training set is 0.12 Winbench points
RMS.

Expected Winbench 98/Windows 98 Performance
-------------------------------------------
CPU_TYPE NO CACHE 512K CACHE 1024K COMMENTS
K6-2-350 ... 27.12 27.43 27.1 actual (512K)
K6-2-400 ... 28.30 28.64 PII-350=28.3 -400=30.8
K6-2-450 ... 29.30 29.66 29.1 measured on slower HW
K6-3-350 30.31 30.66 30.88
K6-3-400 31.93 32.33 32.57 PII-450=31.4, PII-504/112=33.5
PII-500/100 est =33.2
K6-3-450 33.32 33.75 34.01

It is clear that the K6-3 scales up much better than the K6-2.

FYI, a K6-3-400 has the following breakdown of benchmark time:
53% I/O and graphics wait time (a0 term)
33% CPU and L1 time (ap term)
4.7% L2 time (ac term) -- this term 3-4 times higher for K6-2
8.6% L3 and memory access (am term)

As you can see, Business Winbench 98 is dominated by non-CPU issues.
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