The R9600Pro is a very different card than the non-pro.
And based on valves own benchmarks, it runs HL2 OK at normal resolution without AA/AF. 1280x1024 should be ok. I wouldn't be surprised if HL2 with everything enabled runs better than Halo2, which runs pretty smooth on my R9600Pro.
The main thing is how much money you are willing to spend on your Card. 1024x768 is very realistic for most DX9 titles out there, and that's not bad for 'next generation' games on a mid-range card. Certainly an R9700xx/9800xx (except SE) will do better, but at a double the price premium?
I agree with some here (like fragglefart), and have said so for a long time, that you should always wait for the games to actual arrive that push you to buy a new card, but if there is but one good opportunity to upgrade because perhaps ANOTHER game is pushing your current rig (like Halo), then looking towards the HL2 and D]|[ side of things is very realistic.
The main thing with Tribes is that just like CS it is no longer a current title, and the return/interest in optimizing the card to play on it just isn't there to the same extent as newer titles that are more likely to spwan offshoot titles, and other items that upgraders are willing to pay for. Of course they are classic games, but truely they are not the focus of most gamers wanting to get newer cards. Obviously that doesn't work out for people who expected the new technology to translate into performance increases in old games.
Also the R9600non-pro is really a poor example of the R9600 series. They are closer aligned with the FX5200s IMO.
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