I don't get it. The point of (ddrN) memory is latency. If its on the far side of pcie latency is much worse than the system memory. In what sense is this better than ssd on the far side of pcie?

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wmf 5 days ago | parent | next [-]

It's only ~2x worse latency than main memory but 100x lower than SSD.

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JonChesterfield 5 days ago | parent [-]

I'm finding ~50ns best case for pcie, ~10ns for system. Which is a lot closer than I expected.

	▲	adgjlsfhk1 4 days ago \| parent [-]
		no system ram is 10ns. That's closer to L2 cache.

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Cr8 4 days ago | parent | prev [-]

pcie devices can also do direct transfers to each other - if you have one of these and a gpu its relatively quick to move data between them without bouncing through main ram