I purchased two new DDR2 modules but when I tried to fit them I noticed that the pin alignment differs from my existing modules.
No matter which way around the slot still does not line up and the new modules will not fit into the mobo sockets.
The existing working modules (paired) are labelled:
2 x Corsair XMS2 Pro Series, DDR2,
XMS2-5400 512MB 675MHz 220.127.116.11,