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Radeon HD 7770, GDDR5, 1 GB, PCI-E, HDMI, 3D more info
Radeon HD 5450, DDR3, 1 GB, PCI-E, HDMI more info
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Indicates the type of interface the graphic card uses. PCI-E 2.0 gives the fastest transfer rate to the computer (2007) at 5GT/s (compared to PCI-E 1.0 at 2.5GT/s). The AGP interface is an older standard not used in new graphic cards.
Indicates the memory size of the card in GB or MB. More memory gives faster graphics handling and enhanced resolution.
Multiple GPU Support
Multiple GPU support meanse that you can use two or more display adapters in the same PC to speed up the graphics animation for gamers. NVIDIA's Scalable Link Interface (SLI) and ATI's CrossFire are two examples.