Hi everyone, I have read many reviews on different video cards but I'm a bit stuck in finding a good one for my 'new' system. The system which I like to upgrade its video card has the following spec: Its a HP XW8200 (this machine has only 1 pci-e 16x (version 1) , 2x Xeon 3.2Ghz 4Gb of Ram Nvidia Quadro Fx 3400 600W power supply I'm running Vista 64bit and OpenSuse 64bit on it and I'm really happy with it except the video card performance is not great in windows Vista but its excellent in OpenSuse! Here is what I want to use the system for : Programming (including Game development right now I'm using XNA framework) Graphics ( XSI mod tools, blender) Gaming (sometimes) (men this is a long post ) I was looking at the following video cards Radeon HD 4890 Nvidia GTX 275 Nvidia GTX 260 What do you guys think ? Also, how can I check to make sure my power supply can handle these cards? Any help/suggestion is appreciated!