It looks like the system requirements which where quoted before aren't the actual requirements. Those are the requirements to get Unreal Tournament 3 running in high details. The actual requirements are the following:
Minimum System Requirements- Windows XP SP2 or Windows Vista
- 2.0+ GHZ Single Core Processor
- 512 MB of System RAM
- NVIDIA 6200+ or ATI Radeon 9600+ Video Card
- 8 GB of Free Hard Drive Space
Recommended System Requirements- 2.4+ GHZ Dual Core Processor
- 1 GB of System RAM
- NVIDIA 7800GTX+ or ATI x1300+ Video Card
- 8 GB of Free Hard Drive Space
None of my computers cut the mustard but at least it doesn't require a 2.8Ghz CPU as previously thought. 512MB is also a pretty low requirement but generally systems don't run well nowadays with that amount. I'm surprised that they didn't put dual core as a minimum requirement. I know the game would benefit greatly from it. Some people thought the hard drive space requirements are pretty high but UT2004 was taking up 5GB on my hard drive so it's no surprise that UT3 would take more. In fact I'm surprised that it doesn't take 10GB+. Also of course those requirements are for windows, it may be a bit different for OS X or Linux.
One last thing... the PS3 version was delayed until 2008 just like the X360 version was earlier this year. Some people where saying that the PS3 was going to get a timed exclusive. Well it wasn't going to be totally exclusive since the PC version was also slated to come out at the same time but at least for the time being it looks like the PC version is the timed exclusive. The PC version is coming out in November and the console versions are coming out at an unspecified date next year. Although I kind of feel like it is never too late to say that the PC version is also going to be delayed and I just know that the Mac and Linux versions are probably going to come out later too.