Video card upgrade for a Pegatron M2N68-LA mother board?

Im looking for a video card upgrade for my compaq Presario cq5500f( Pegatron M2N68-LA mother board) with a 460watt upgrade, im kinda a noob when it comes to getting a video card. When i was looking for a video card, I saw brand names such as ASUS,diamond, galaxy, giga bite, etc. what does that mean?|||That motherboard supports PCI express graphics card. If you are putting a good/true-rated 460 watt power supply, then consider the Radeon HD 5770 or the Geforce GTS 450 graphics cards. These cards come in various brand names because there are several manufacturers such as those you mentioned.