Sorry wasn't clear on my orginal post, it's 2 different machines
Actually I popped what I thought was the 8400GS in and it turned out ot be an 8500GT (was the one shipped with my housemates pc, but we upgraded his)
The HD2400 wasn't an option as it's still in the Atom and is infact a Low profile PCI card (Don't find to many of them about
)
Now all I need to do is get some Ram (I pinched the 2gb stick out my atom machine for now, although its 667 and non ECC where as the oringnal module in this machine is 800mhz ECC, although the machine doesn't care if you use non ECC memory and a soundcard that will either work in a 3.3v only PCI slot or a usb one.
The atom was a nice little machine and it will probably end up being my fileserver, or used via synergy to run the other screen so i can have IRC up when playing Eve (If i use 2nd monitor on same machine game minimises when you move offscreen)
Currently using a HP server as my pc and it's noticably faster (I picked up one of the ML115's that are on offer atm, quad 2.1 opteron
)