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Are not all PCIe cards x1 compatible? ie they fit into a x1 slot even if x16 card. Reduced bandwidth OK but a cheap silent HD5450 or similar.
Nvidia Quadro Nvs 290 Pcie X1 Graphics Card, Radeon 520 series, PowerColor ATI Radeon HD 5450 Go!
or others are available.
I use a radeon 7000 32MB PCI card for troubleshooting, dirt cheap off the bay.