Graphic cards typically take quite a bit of space, have heat issues, and consume power that your existing power supply might not have enough of. Because they are power consumption hogs, you typically need to connect them directly to the power supply, as the bus is not capable of supplying enough power (sometimes 25 Watts).
So there is a place for low profile video cards, lower in power consumption, not taking a lot of your case’s space therefore helping with the ventilation in the case, and not needing to add extra power cables to the setup. These boards, while less powerful than their high profile brethren still offer much better performance compared to the stock graphics soldered on retail motherboards.
The only disadvantage of low profile video cards is if you are running high performance games. Then you have to look at more leading edge cards that can handle the 3D graphics of the game. It is a good idea to run online searches and visit forums to match up your graphics card with the game you have in mind.
Some low profile PCI graphics cards include:
GeForce 8600GT – A high performance card, offering PCI Express x16, 512 Meg on-board RAM, manufactured by Chaintech, 32 CUDA cores, max resolution of 2560×1600 , nVidia chipset.
VisionTek 900118 Radeon X1650PRO – ATI chipset, 256 Meg memory, 2048×1536 resolution, GPU: Radeon X1650PRO
ASUS GeForce 210 – this low-cost card from a manufacturer known for quality, offer NVIDIA GeForce 210 chipset, Resolution: 2560 x 1600, D-Sub Max Resolution : 2048×1536, DVI Max Resolution : 2560x1600DDR3 1GB, power: up to 75 with no additional PCIe power required
Some more expensive and high power cards:
Sapphire Radeon HD 7750 1GB – AMD, can be used in slimline cases, 1 Gig of ram provides exceptional performance. A point is to install drivers specifically provided by Sappire, and not the AMD driver, which some people had problem with.