You will may find that for any fairly modern dual-core CPU (even an
Athlon64 X2), the CPU will outperform pretty much all of the hardware
crypto-accelerator offerings, except for the most recent and high-end.
This is *especially* true when you are doing many small cryptographic
operations, which I assume Tor may be doing. You'll still at least get
the benefit of offloading all of these operations from the CPU, freeing
it up to spend time on other tasks.
this website gives more details confirming this statement.
http://sslacceleration.info/64bit.shtml
Interestingly, GMP benchmarking puts the Athlon64 significantly ahead of
the intel offerings (i7 being one of them) for complex math. Although
one must consider that the compilers are different versions etc.
http://gmplib.org/gmpbench.html
Certainly, given the low cost of the amd64 chips. For a CPU bound task
like SSL Acceleration, it would be interesting to see what the best bang
for buck would be in a cluster.
Dean
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