8-Core Mac Pro Hobbled
The seeming deadlock may be attributable to a lack of real-world bandwidth, photographer Lloyd Chambers writes.
"Memory bandwidth is inadequate for 8 cores. It's already a limiting factor with the current quad-core 3.0 GHz Mac Pro," he says. "Memory copy speed is at best 2.9GB/sec on the Mac Pro, in spite of Apple's highly misleading claims of 21.3 GB/sec... That's a measly 700MB/sec per core on a quad-core machine, and only 350MB/sec per core on an octa-core machine. By comparison, a 6-drive hard disk RAID array can easily perform at over 400MB/sec!"