But here's the problem: when I look under the specifications tab (it's above the description), the following comes up as a descriptor for its PCI Express 2.0 x16:
1 x PCI Express x16 slots, running at x16 (PCIEX16_1)
1 x PCI Express x16 slots, running at x8 (PCIEX8_1)
2x PCI Express 2.0 x16 slots with ATI CrossFireX support (single X16 or dual X8)
I don't really understand what this says, and when I look it up, I'm confused whether this means it has two PCI-E x8 slots or one PCI-E x16 slot...anyway, I can't figure it out. Can someone please explain what that means, and can you guys tell me if this old GFX card will fit into these new motherboards:
Basically, pci-e lanes can only shove through so much data, so the more lanes you have the faster you can shove data through, it being a serial connection, each slot needs individual lanes rather than being able to share the same bus like a parralel one such as pci.
So a slot with 16 lanes will hae a theoretical throughput twice as high as a slot with 8 lanes, however, it does not mean you will see an increase in performance unless the data travelling to and from the slot exceeded the capacity of the lanes if you see what i mean.
That should be how it works.
Alright. Thank you very much, now I get it, but do most video cards push enough info that the x8 is keeping it back?
i do not know what causes bandwidth usage of the pci-e lanes myself, but have never seen a test that saturates pci-e 1 x16 or even 8x, pci-e 2 can handle twice as much as pci-e 1 so pci-e 2 8x is equal to pci-e 1 x16.
Tweaktown did a P45 vs x48 xfire comparison where they compared x16 and x8 PCIe modes for dual graphics cards. Sadly they only did a few tests but in most cases there was little of an impact on FPS, however, there was a FPS loss with Crysis and then with high AA/AF settings at the high resolution of 2560. I wish they would have tested with a lot more games, but it is what it is.