My quick 2p
Riddlin, Your PC can access 3.4(?)Gb RAM and 32 bit applications usually can allocatre a full 2Gb for its use so going to 4Gb wouldn't be a waste and would ensure a full 2Gb for say IL-2 or CoD.
A GPU upgrade could also be helpful. Really depends on whether the GPU or the Processor is the current limiting factor (I don't know that one).
janik, agree with jibo but if you can't afford the 580 the 570 is a good second bet although it has less memory (1.3Gb).
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klem
56 Squadron RAF "Firebirds"
http://firebirds.2ndtaf.org.uk/
ASUS Sabertooth X58 /i7 950 @ 4GHz / 6Gb DDR3 1600 CAS8 / EVGA GTX570 GPU 1.28Gb superclocked / Crucial 128Gb SSD SATA III 6Gb/s, 355Mb-215Mb Read-Write / 850W PSU
Windows 7 64 bit Home Premium / Samsung 22" 226BW @ 1680 x 1050 / TrackIR4 with TrackIR5 software / Saitek X52 Pro & Rudders
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