Re: Resolved - was [Re: Identifying CPU]
On 8/31/2013 10:00 AM, Richard Owlett wrote:
> Especially as I explicitly emphasized wanting to know bus width.
I find it curious Richard that you emphasize this, given that the "CPU
bus width" in isolation is meaningless.
Every x86 CPU since the original Pentium that shipped in 1993, up to the
Opteron which shipped in 2003, had a 64 bit wide data bus, clocked from
66 to 266MHz, including double/quad pumped buses. Throughput has varied
from the first to the last model from 528MB/s to 8.5GB/s.
In the post Opteron era the memory buses are decoupled from the system
interconnect, the latter no longer being a bus but a apir of
bidirectional point-point serial links. Modern CPUs have 2 to 4x 64bit
wide memory buses clocked at up to 1600 MHz, for a combined DRAM
bandwidth of 25.6 to 51.2GB/s. The system interconnect links,
HyperTransport in the case of AMD CPUs, provide from 3.2GB/s to 12.8GB/s
one way.
On CPUs shipped since 2003 in the case of AMD, later for Intel, there is
no singular "bus width". There are 2, 3, or 4 memory buses, and a
system interconnect, all clocked at different speeds on different vendor
models.
So I fail to see why your knowing the "CPU bus width" is relevant to
anything.
--
Stan
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