id Software (Todd Hollenshead specifically) have finally spoken and have revealed the official minimum requirements these are: Minimum: P4 1.5Ghz CPU (or equivalent). 384MB of RAM. 64MB graphics card (see below for chip details). 2GB of free hard drive space. Lowest supported GPU is a Geforce 4 MX (worse than Geforce 3). Supported cards: GF 4 MX. GF 3. GF 4. GF FX (and higher). Radeon 8500s, 9000s and higher. PC Gamer were the first to review they themselves recommend: 2Ghz CPU. 512MB RAM. Radeon 9800. 5-channel sound card and speakers.