Tom Marchant pisze:
On Thu, 11 Feb 2010 10:00:30 -0500, zMan wrote:
On Thu, Feb 11, 2010 at 9:58 AM, Tom Marchant wrote:
A z10 is not 4 times faster than a
z9 with the same number of engines, or even for maximum z9 compared to
maximum z10. Not even close. It is closer to a 50% increase. Check the
LSPR for details.
Isn't it more like 2x, "reduced" to about 1.5x due to the "technology
dividend"?
Good point. IIRC, the technology dividend is about 10% and it does make a
difference but still considerably less than 2x, I think.
Facts: z9-701 vs z10-701
Clock: 1.7GHz vs 4.4 GHz
MSU: 81 vs 115
MIPS: 580 vs 920
Two times faster could mean clock speed, which is rather useless for the
user. Real CPU speed, without "technology divident" marketing tricks is
roughly 1:1.5 - very similar as for z/990 vs z9 (450 vs 600), or z/900
vs z/990 (300 vs 450).
BTW: "technology divident" is more tricky than it look like. MSU base is
indeed lower by approx. 9%, but software fee as a function(MSU) is
non-linear, so your fees need not to be 9% lower.
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