Doubt about playing in ultra settings

Can I play the latest games (BF3, Skyrim, etc.), the most graphics intensive games, and upcoming games in Ultra Settings and Max Resolution (1920:1080, 1080p, HDMI) with these specs and without lagging?

CPU - Intel Core i5 2500
GPU - Saphire Radeon HD 6870
RAM - G.Skill DIMM 8 GB DDR3-1600
PSU - Thermaltake Litepower 600W