Minimum System Requirements
Processor: Intel(R) Pentium(R) 4 2.8 GHz or AMD(R) Athlon(TM) XP 2800+ processor (Pentium 4 3.0GHz or equivalent for Windows Vista)
Memory: 512MB RAM (768MB for Windows Vista)
Graphics card: 128MB NVIDIA(R) Geforce(TM) 5700 or ATI(TM) Radeon(TM) 9700 (full list of supported chipsets below)
Sound card: 100% DirectX 9.0c compatible sound card
Harddisk: 750MB of free hard drive space, plus 200MB for Windows swap file
Internet: Broadband connection and service required for full gameplay and downloads. Features may change without notice.

SUPPORTED VIDEO CHIPSETS

NVIDIA GeforceFX Series (5700 or higher, not including 5700LE and 5700VE)
NVIDIA Geforce 6 Series (6200 or higher) NVIDIA Geforce 7 Series (7300 or higher)
NVIDIA Geforce 8 Series
ATI Radeon 9700 or higher
ATI Radeon X700 or higher
ATI Radeon X1650 or higher



Old estimates for historic purposes:
The final specifications hasn't been released by id Software yet, thease are according to take2.co.za. Expect ET:QW to require more RAM than what is stated here though, 512 MB for minimum & 1024 MB as recommended would probably be a better guess, since Doom 3 required 384 MB

System requirements close to Quake 4
"In talking to Kevin Cloud and Paul Wedgewood of id Software and Splash Damage, it was expected that the game would have the same requirements as Quake 4. -- 2007 Santa Monica California Hands on preview session

Minimum System Requirements
Operating System: Windows 98/2000/ME/XP
Processor: Pentium PIII 800 MHz Processor or AMD Athlon
Video Card: NVIDIA GeForce 2™ or ATI Radeon™ 7000 or higher
CD-ROM: 4X or Faster
RAM: 256 MB RAM

Recommended System Requirements
Operating System: Windows XP
Processor: CPU Pentium 4 2.4GHz or Athlon64 3000
Video Card: Geforce FX 5700 or Radeon 9600 or higher
CD-ROM: CDRom 52x or DVD Rom 16x
RAM: 512 MB RAM


Links...

setup

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Three years back a young NYPD cop, Max Payne, came home one night to find his family senselessly slaughtered by a gang of drug-crazed junkies, high on a previously unknown synthetic drug. Now that same drug, Valkyr, has spread through the whole New York City like a nightmare plague, and Max Payne’s on a crusade for revenge, out to get even. To Drug Enforcement Administration, DEA, this new drug was evil incarnate, to be stopped at any cost. Max's boss and best friend, the only one who knew his true identity, has been murdered, and Max's been framed for the slaying. Everything ripped apart in a New York minute... Max Payne is a man with nothing to lose in the violent, cold urban night. A fugitive undercover cop framed for murder, and now hunted by cops and the mob. Max is a man with his back against the wall, fighting a battle he cannot hope to win. Prepare for a new breed of deep action game. Prepare for pain...


Links...

part 1
part 2
part 3