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What is a 2.1 in the description of a pci-e grapic s card referring to?

Last response: in Graphics & Displays
November 27, 2011 3:59:09 AM

I am looking at a replacement pci-e card for a m2n-sli motherboard. In the description for it, a gigabyte gv-r 687 OC-1GD Radeon card HD 6870, it refers to pci-e 2.1 . Will it work on my slightly old mother board?
November 27, 2011 4:04:21 AM

It refers to the version of PCI-e x16 it has. It's the transfer speed and systems involved in the slot.

1.0 has a transfer rate of 2.5GT/s, 250mbps data rate.
2.0 has a transfer rate of 5.0GT/S, 500mbps data rate
2.1 has the same speed as 2.0, with technologies being incorporated into 3.0
3.0 has a transfer rate of 8.0GT/S, and one of the technologies is removing the 20% overhead that was on 2.0, so it effectively doubles the transfer rate of 2.0.

which motherboard do you have?
a b U Graphics card
a b V Motherboard
November 27, 2011 4:24:35 AM

yes, they will be fine.