> I thought PCIe Gen2 x 8 @ 500 Mhz gives 8GB/s? I know there are 250 and > 500 Mhz variants in addition to the lane sizes, so while a 250 Mhz x8 link > wouldn't provide enough bandwidth to a dual-port card, the 500 Mhz one > should. But I'm woefully out of date on my hardware knowledge, it seems. > Of course, EDR (eight data-rate) IB is on the roadmap for 2011, so if we're > in no rush that could help, too. >
Er,.. I thought about this a half-second after I sent it. First, that's 5.0 Ghz, not 500 Mhz, and second, that's probably aggregate bi-directional throughout at 8 GB/s, isn't it? So, I got it, 4 GB/s per direction, which means dual-port won't get us much in terms of unidirectional throughput. - Brian
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