Ooooh, no it isn't
the GT240 is a new, 40nm GPU with 96 "cuda cores" (as NVidia would have it) and either GDDR3 or GDDR5 memory on a 128bit bus (a bit of a mixed bag really) whereas the 9600gt is 64 cores and a 256bit memory bus. 512MB GDDR3 versions are just under £60, and would be bad for gaming (crippled by the low memory bandwidth) but should be brilliant for folding (the GDDR5 versions should be reasonable gaming cards, however). Plus, it has a TDP of just 69W (i.e. no additional PCIe power connectors

) - very important consideration if I'm going to be running the machine 24/7.
the OEM-only GT
S240
is a rebranded 9800GT - 112 cores, 256bit GDDR3 memory interface. Not interested!</archi-lecture>
right now, I'm watching a couple of 8800GS's on fleabay (that's the one that was rebranded to the 9600GSO!) - but
tbh I really can't afford even £20 on a new GPU right now and it's mostly of academic interest until maybe Feburary...