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Governments were the consumers of that Opteron/FPGA hybrid product. It was an interesting idea but way too difficult to use for anything that would justify the cost. In practice, the FPGAs seemed to mostly be used to run crypto algorithms and codecs, which seems kind of disappointing. I vaguely recall some attempts at building ticker plants with them but I don’t know that it was ever actually used for that.

When I first heard the news, I started imagining EPYC with some core dies replaced with FPGAs connected to the Infinity Fabric.

Really cool to hear this used to be a thing with HT (though long before chiplets), gives me some hope we'll see something like that again.

HFT, probably.