1024x768 (tried at 1152x864 and it ran smooth too), Everything high, Reflect All, 4xAF, No AA. You can definitely do that and probably do 8xAF and 2xAA as well. For those who have beaten HL1 and HL2 (or don't really care about the story and spoilers), here's a handy Half-Life story timeline. http://members.shaw.ca/storage_4/hl2story/