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http://iworkwithtech.com/pcgames/gtaiv
Take these with a grain of salt.
Typically Rockstar will give a lower expectation of system requirements than what the kids normally  cook up.
Minimum System Requirements for Mass Effect on the PC Operating System:
Windows XP or Vista
Processor:
2.4+GHZ Intel or 2.0+GHZ AMD
Memory:
1 Gigabyte Ram (XP)
2 Gigabyte Ram (Vista)
Video Card:
NVIDIA GeForce 6 series(6800GT or better)
ATI 1300XT or better (X1550, […]

Well if you have been wondering how it works and how it looks.
Let’s look at what IGN thinks about GTA IV

Some dude just farts around with the game. Looks like he has the game and is playing it.
Maybe he’s a beta tester?
Maybe he’s the son of someone big?
Could be a pirate - I do not know - but here is the feed.
But from the rag doll effects and how the assaulted ball up and gets […]

I have doubts, but what the hell?
Here is a link where people are talking about where or how to locate an early release.
From what I understand, all early releases aren’t real, and loaded with brand new unidentified viruses.
Good luck scanning them.
Early GTA IV