MSI has a reputation of using weak VRMs on all but their high-end boards. I see from some pictures of it that his mobo doesn't even have heat sinks on the VRMs. If you overclock it at all, do it on STOCK VOLTAGE only, and don't push it too hard even then. Good luck.
Edit: You may be in luck. The B75 isn't an overclocking chipset, so he may not be able to push it all that much. If you want to overclock, look for a Z77 or Z75 chipset board, preferably from Asus, Gigabyte, or ASRock. Asus in particular uses better VRMs, with thermal protection.