Microsoft Windows XP Professional (5.1, Build 2600) Service Pack 3
Intel Core 2 Duo CPU
E8400 @ 3.00GHz (2 CPUs)
2.99 GHz, 3.25 GB of RAM
ATI Radeon HD 4350 PCI-E 512 MB Graphics Card
Since a poster just a few up from you got decent results with the same CPU (E8400), it'd just be your video card holding you at that level. 4xxx is last generation, and x3xx is the bottom of the barrel (geared towards media playback rather than gaming), which is why it's not giving you much performance in the benchmark.
Using the PassMark score guide method (1500+ score on a component), the "minimum" would be a 5770 (just over a 1500 score). Assuming you're just looking to be able to play it at all reasonably (lowest resolution, lowest detail, etc.), I would think you could get away with a lesser card, but on the ATI side you'd probably still want to be at least at a 5670 or 4770 sort of level if possible. A 5770 is around $170 these days, and a 5670 would be around $100. Obviously the higher the video card you can manage the better, but a $100 card is probably going to be the minimum "safe" bet (from what I can tell from specs and other benches and such -- no guarantees a 5670 would indeed work well enough, but it looks like it should probably be okay at minimum settings).
Without getting feedback from someone in the beta with a similar sort of setup it'd be hard to say for sure what will or won't work, but I certainly assume that those of us currently scoring ~500 on the low-res bench are pretty well hosed no matter what (unless they've actually got a 640x480 or 720x480 res available then maybe we'd be able to squeak by with absolutely every effect/detail turned off). :)
Oh yeah, and yes it's rumored we'll have a new benchmark, but mostly I assume it's because the engine settings have been tweaked and finalized and so the original benchmark probably isn't at the same level of support (whether it's just some things like optimization or features like SLI or whatever). I wouldn't expect to be propelled from a 500 to 1500 (or even 1000) once the new benchmark is out, but maybe you'd go to a 550 or 600 if there are some optimizations in play. It'll probably make more of a difference for those who already have a reasonable level of performance in the current benchmark as maybe they were just under 30fps and will actually be able to get 30+ in the real game (and new bench). Have to see for sure when we get the updated benchmark app. Edited, Aug 26th 2010 10:24am by Triane