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Old 04-28-2006, 10:55 PM
c d saunter
Posts: n/a
Default Re: Opteron HT coprocessors

JJ ([email protected]) wrote:
: In comp.arch (and others) there is a thread on this Opteron Virtex4
: coprocessor that sits in socket 940.


: I wonder what others think of this, at $4500 its way to steep for most
: individual buyers who might happen to have a dual socket Opteron board
: (I don't), but I wonder if companies like Digilent, Enterpoint and
: others might see any opportunity to build a much lower cost edu version
: that is more in line with the cost of an Opteron cpu chip say <$1k and
: based on best Spartan3 or Virtex2,4 that can still use Webpack.

I expect the $4500 reflects development costs and what the market will
bear more than anything else - after all the only thing I've seen near it
was the old Pilchard FPGA on a DIMM research project.

: I also wonder how much faster exactly the HT link is over any of the
: PCI interfaces.

HT can be implemented much faster than parallel PCI but perhaps more
importantly when used with an Opteron is that it's much more tightly
coupled to the CPU. Looking at the upcoming HT3 I feel the best is yet
to come.

One of the posibilities that interest me is a V4 module sitting in a 940
socket with some MGTs wired up (space is tight - I realise that!) - if
you happen to be dealing in high speed data aquisition and processing on
the bit/word and (large) frame level then a tightly coupled
FPGA/commodity CPU system is really quite exciting.


: John Jakson
: transputer guy

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