don't buy a 560. a 2gig 6950 is good. way more than enough at your res. ( regardless of your low res, get a 2gig frame buffer )
the ram, how many slots on the board, 4? maybe you need to look at the booklet for proper placement?
or you need to try each one in the same slot to see if one of them is bad or switch slots with a single stick to see if the slots are bad.
never liked Foxconn boards. upgrading that ( if it's bad ) is the second thing I would do. No need for an entire system. wouldn't make any sense.
If I were to get a Radeon HD 6950 2GB, what resolution would you recommend if I bought a new monitor? Is upgrading my motherboard essential or could I upgrade the graphics card fine without doing so?
And would there be any issues with compatibility?