Replies to post #26239 on Advanced Micro Devices Inc (AMD)

[calbiker]

sgolds- We're pretty much on the same page, there's more we agree on than not. That's always a good sign. Ha.

The link you provided is great. The latency to make one HT hop looks to be about 40 ns. Intel's northbridge latency is probably also in that vicinity. But now, here's the rub. HT needs to be converted into PCI Express. There's a translation latency as well as the standard PCI Express latency. In other words, Opteron has more latency when outputting a PCI Express signal than Intel's system. It's probably not significant in many cases, but I'm just throwing it out there to discuss.

PCI Express is pretty tight fisted with their specification, they want big bucks for the casual observer to look at them. But I'll see if I can't get a hold of it and see what order of magnitudes these latencies are.