I currently have some pretty fast DDR2 in my computer. It is running 626mhz 4-4-3. But 1gb doesn't seem to be enough, I often have several programs open at once: Adobe Photoshop, Adobe Premiere Pro, 3DS Max, and several IE windows open. It eats up 1gb like nothing else. I have an extra 512mb DDR2 PC4200 4-4-4 here, and it is slow in comparison to my current RAM. Which would be faster for me? 1.5gb single-channel DDR2 533mhz 4-4-4, or 1gb dual-channel DDR2 626mhz 4-4-3?