There are two things you should take in account:
1) C7 (UDMA CRC Error Count) is usually related to cable connection problems, you could start by replacing an aging or kinked sata cable, or try another SATA port.
2) I've used a DFI 790FX/SB750 based board for about 9 years, and it had the particularity of very sparsely causing C7 errors on all drives (good quality sata cables and every other hardware component were exchanged during that period, so it wasn't related to stability problems, it was really board related). The frequency was very low, something like 1 or 2 per year at most (depending on drive usage) on secondary hdds, and a bit more frequent on a system drive (like a SSD) with maybe 3-5 in a year. This didn't happen at all (after years of use) on drives connected to a external sata controller on a pcie slot in that system, and those same drives that were slowly showing C7 errors would cease doing it permanently after being connected the external marvell controller. My other 890GX/SB850 board never showed this issue.
If your 760G has a SB710 southbridge, it's possible that it shares the same problem as my SB750 did. Either a bug on the SB7xx family, or in the AHCI rom present on those BIOS (the last bios for my DFI mb was in late 09'). For my experience, using MS AHCI or amd sata drivers is also indifferent, and some of these C7s appeared after heavy hdd operations like cloning partitions by means of bootable drives outside Windows.
Given that these CRC issues are very rare, and are detected (meaning no data corruption will happen), I wouldn't bother much about them.
OTH if you have tons of them, it's another issue unrelated to "2)". Look into the physical connections and cables then.
