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PowerMac Processors

D

Don Cherry

macrumors newbie
Original poster
Dec 24, 2004
11
0
Long Island, NY
What is the difference between, let's say a 1.8GHZ single and Dual processor, besides the obvious?

A Dual 1.8, is that two 900MHZ processors or two 1.8GHZ?

What is the performance gap between these?
 
Sun Baked

Sun Baked

macrumors G5
May 19, 2002
14,937
157
The SP PowerMac is a iMac in a PowerMac case -- so the single processor chipset (U3-Lite+Shasta) is the consumer chipset with the FSB running at a third of the CPU clock (600MHz.)

The DP PowerMac has the dual CPU capable XServe/PowerMac chipset (U3H+K2+PCI-X Tunnel) run their FSB at 1/2 the 1.8 (900MHz) -- in addition the 2.0/2.5 have a faster HT bus and HT PCI-X Tunnel that the DP 1.8 doesn't include.

The DP are basically twice as fast as the SP machines that take advantage of SMP -- and faster than the SP machines that don't because the OS will split threads between the two CPUs, so an monolithic app that hogs a CPU won't bring everything else to a crawl.
 
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