On newegg the ASUS M4A89TD PRO/USB3 AM3 AMD 890FX SATA 6Gb/s USB 3.0 ATX AMD Motherboard says it has 2 PCI express 2.0 x16 slots.
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The MSI 870-G45 AM3 AMD 770 ATX AMD Motherboard says it has 2 PCI express 2.0 x16 slots (x16, x4)
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The ASRock 970 EXTREME4 AM3+ AMD 970 SATA 6Gb/s USB 3.0 ATX AMD Motherboard with UEFI BIOS says it has 3 PCI express 2.0 x16 slots (x16/0 or x8/x8, x4)
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I've been looking on google, and there seems to be a slight difference in performance between PCI express 2.0 x4, PCI express 2.0 x8 and PCI express 2.0 x16, but in the pictures all of the PCI 2.0 express slots look identical. I don't understand why there would be any difference at all between them if they look identical. How would I even know which one is a PCI express 2.0 x4 or PCI express 2.0 x16?
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The MSI 870-G45 AM3 AMD 770 ATX AMD Motherboard says it has 2 PCI express 2.0 x16 slots (x16, x4)
PICTURE
The ASRock 970 EXTREME4 AM3+ AMD 970 SATA 6Gb/s USB 3.0 ATX AMD Motherboard with UEFI BIOS says it has 3 PCI express 2.0 x16 slots (x16/0 or x8/x8, x4)
PICTURE
I've been looking on google, and there seems to be a slight difference in performance between PCI express 2.0 x4, PCI express 2.0 x8 and PCI express 2.0 x16, but in the pictures all of the PCI 2.0 express slots look identical. I don't understand why there would be any difference at all between them if they look identical. How would I even know which one is a PCI express 2.0 x4 or PCI express 2.0 x16?