Specs that are not playable

[Eldur]

AMD Phenom II X4 955 4x 3.2GHz
8GB of DDR2 rated 800 (they're 1066 but my board doesn't like that speed with all four slots used)
Radeon HD3870 512MB

And it's absolutely unplayable. OK, my graphics card is below the specs, but a slower GeForce 8800 is not (it's comparable to a X1800XTX or X1900).
I get 10-40fps on lowest settings @ 1280x960, but still the controls feel like it's just 1-5fps. When I push the trigger, nothing happens for about 3 seconds while the sim is still being rendered at 20-30fps, then it starts fireing. Well, I run DCS Black Shark with even less FPS (around 20avg, gets lower sometimes) without problems. Running 1024x768 is impossible due to heavy visual artifacts.

Most probably I need to spend some cash on a new graphics card... something in the range of 5850/5870/6950.

But I just wonder about the excessive input lags.