Other than that, they're identical: 6 SATA III controllers, 2 USB 3.0 ports on the back, support 2-way SLI/CrossFire, 4 dual-channel RAM slots (max of 8GB/slot, 32GB overall), support RAID 0/1/5/10, 6 audio ports plus Optical & Coaxial SPDIF ports, & built-in Gigabit LAN port.
Note that, while the descriptions claim that the GD80 doesn't support FX-series processors, the Support tab lists the FX-series as being supported on the board.
Also, while the GD80V2 seems nearly identical to the GD80, the GD65V2 is not (has 1 x16 and 1 x8 PCIe slot in place of the 2 x16 slots; only supports FX-41xx/61xx/81xx series processors at best).
Yes, that's what I was saying: the specs list didn't show FX-series support, but their CPU support list did list the FX-series (at least up through FX-8350).
Soundwise, they both have identical chipsets (990FX/SB950 southbridge) & have identical specs, so they should have identical sound quality.
As for price, unfortunately pcpartpicker.com only lists the GD65V2 ($137.27 USD) & GD80V2 ($171.49 USD) models as being available. Newegg.com has the GD80 available ($162), but lists the GD65V2 as out of stock. Amazon lists 2 available for $99, but they're listed as used, with 5 of the GD65V2 in stock for $129.99.
Budget-wise, the GD65 is probably better if you don't need eSATA/1394 ports, or if you're not planning on 3-way SLI now/in the near future. However, if you can't find it, then I would recommend considering something like Gigabyte's GA-990FXA-UD3 board, for the same price & performance.