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Old 05-07-2012, 02:48 PM   #46
KimmoK
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Default Re: Linux PowerPC Blender benchmark
G5 FSB...

Was it 32in + 32out hypertransport kind of bus?
For example on 2Ghz G5 the FSB ran at 1Ghz (2x4GB/s).

While G4 can do 1.3GB/s(one direction at a time) and PA6T 32 GB/s (IIRC 16+16).
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Old 05-07-2012, 02:56 PM   #47
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Default Re: Linux PowerPC Blender benchmark
According to Wikipedia:
Quote:
The processor has two unidirectional 32-bit double data rate (DDR) buses (one for reads, the other for writes) to the system controller chip (northbridge) running at one quarter of the processor core speed. The buses also carry addresses and control signals in addition to data so only a percentage of the peak bandwidth can be realized (6.4 GB/s at 450 MHz). As the buses are unidirectional, each direction can realize only half the aggregate bandwidth, or 3.2 GB/s.
So not exactly optimal (why oh why is there still address/data multiplexing in this day and age!?) but a damn sight better than the G4.
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