Home theater PC builds have different requirements from regular PCs, with space and noise levels being two of the design considerations. The HIS HD 7750 iCooler 1GB GDDR5 PCI-E video card in the roundup today is a low profile card with a non-reference cooling solution that help keep noise and heat levels at bay. We also have an article that explains what all those memory timing numbers represent.
Memory Timings Explained @ ThinkComputers
HIS 7750 iCooler 1GB GDDR5 PCI-E Video Card @ Madshrimps