Yes, the Intel QX9770 C1 is compatible with the XPC Barebone SG45H7.

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The maximum resolution is 1680 x 1050.

The maximum physical memory which can be shared with the onboard video output is 384 MB.

Yes, all models of the H7 series can be upgraded to the 500 Watt power supply, please see item PC63.

Please note that the PC50 (300 Watt) or the PC55 (450 Watt) power supply will not work with these models.