8400gs just absolutely smokes the crap out of the 2400 both pro and XT, you really should just look up stuff befor buying randomly.... http://en.wikipedia.org/wiki/Compar..._processing_units#GeForce_8_.288xxx.29_series http://en.wikipedia.org/wiki/Compar...s#Radeon_R600_.28HD_2xxx.2C_HD_3xxx.29_series also the 8400gs is on a whole different level power efficiency wise. altho its expensive, for about the same price somebody could get something around the level of whats in my box... probably around 75-90 dollars or so, i havnt been seeing an 8400gs for all that far off from that. or if your really hard up for cash a 7900gs or x1950pro would be good, 8400gs isnt bad tho since you already have it... so long as your not playing anything with requirements far above doom3 you will be fine. plus it all depends on the user too, some people feel bad below 60fps, some people are fine with 30fps and ugh, some people are actually comfortable with being in the 15fps range. plus resolutions, im fine with 1360x768, alot of ppl find that to be painfully low, and alot of people are ok with 640x480 i see the list of things you intend on testing, i wouldnt really feel too bad if it doesnt perform well, its not going to, atleast not in the crysis demo, altho you might have some luck with like cod4 crysis is coded poorly and flops at max settings on my beast hey! that reminds me i might be in the market for a good deal on a used 8400gs so long as its pci express [agp is useless to me] looking for a linux card... you really might do yourself some good upgradeing to like oh i dont know, something in the 75-100 dollar range, if you need some advice on what to buy, the 9600gs performs pretty good for its price, up with the high end 8800 series cards you can see how they all stack up on that site i pasted earlier in this post. heh some things you wanna look for is the texture fill rate, and the memory bandwidth, probably the texture fill rate more than anything else.