hmm, ok panning is either you're low on vram or your ram is having troubles.
How much vram did the 560 come with. Check if it's getting filled up completely (close to 100%). If yes, decrease your resolution.
As far as I can tell the XMS module you got (you gave a wrong serial by the way), is a 1.65V module. The fact that it's running tells me that the motherboard probably underclocked it and it's possibly running under spec. You'll need to go into BIOS and verify the settings. A better option is to actually get 1.5V memory module that doesn't require undervolting in order to work with your board.