F.E.A.R. Extraction Point
The amount of memory the PowerColor HD 2600 Pro 512MB is equipped with has no effect on its performance in F.E.A.R. Its result is good enough for its class, and you can play the game at the highest graphics quality settings and at a resolution of 1280x1024, even though without any reserve of speed.
Half-Life 2: Episode One
The PowerColor is a little but slower than the ATI Radeon HD 2600 Pro that has the standard GPU and memory frequencies. The difference isn’t critical, though. Both versions are not too fast, but deliver over 25fps. Your gameplay should be normal at such a speed theoretically, but you should consider faster solutions like Nvidia GeForce 8600 GTS or the outdated, but still robust, ATI Radeon X1950 Pro, in order to have comfortable gaming conditions.