You’ll need a nippy processor to power the PC version of Brink: the very least you’ll get away with is a dual core.
A GeForce 8800 GS or ATI Radeon HD 2900 Pro are the oldest graphics cards acceptable.
Full system requirements are below. Note that you’ll obviously need an internet connection to play this, an online shooter.
The Steamworks tools used by Brink are Achievements, VOIP, Challenge Leaderboards, Valve’s Anti-Cheat, Dedicated Servers (hooray), Friends Support and the Steam Cloud.