On my optiplex 745 small form factor pc I know I can put in pci express card, but I am not sure which one to get as there is only space for two connectors on the backplate of my computer from the graphic card.
I would suggest
ZOTAC GeForce ION-GPU-A-E Graphics adapter - 512 MB - DDR3 SDRAM
Newegg.com - SAPPHIRE 100253HDMI Radeon HD 4650 512MB 128-bit ...
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