请问dc7900UsD这款机子可以更换Q8200或Q9550的CPU吗？哪里可以查看这款机子的CPU支持列表

您好，感谢您选择惠普产品。
惠普官方在您机器上测试过的CPU型号如下，没有测试过您所述的这款CPU：
Intel Celeron 440 processor 2.0 GHz, 512 KB L2 cache, 800 MHz FSB
Intel Celeron 450 processor 2.2 GHz, 512 KB L2 cache, 800 MHz FSB
Intel Celeron dual-core E1200 processor 1.6 GHz, 512 KB L2 cache, 800 MHz FSB
Intel Celeron dual-core E1400 processor 2.0 GHz, 512 KB L2 cache, 800 MHz FSB
Intel Celeron dual-core E1500 processor 2.2 GHz, 512 KB L2 cache, 800 MHz FSB
Intel Pentium dual-core E2200 processor 2.2 GHz, 1 MB L2 cache, 800 MHz FSB
Intel Pentium dual-core E2220 processor 2.4 GHz, 1 MB L2 cache, 800 MHz FSB
Intel Pentium dual-core E5200 processor 2.5 GHz, 2 MB L2 cache, 800 MHz FSB
Intel Pentium dual-core E5300 processor 2.6 GHz, 2 MB L2 cache, 800 MHz FSB
Intel Pentium dual-core E5400 processor 2.70 GHz, 2 MB L2 cache, 800 MHz FSB
Intel Core 2 Duo E7200 processor 2.53 GHz, 3 MB L2 cache, 1066 MHz FSB
Intel Core 2 Duo E7300 processor 2.66 GHz, 3 MB L2 cache, 1066 MHz FSB
Intel Core 2 Duo E7400 processor 2.80 GHz, 3 MB L2 cache, 1066 MHz FSB
Intel Core 2 Duo E7500 Processor 2.93 GHz, 3 MB L2 cache, 1066 MHz FSB
Intel Core 2 Duo E8300 processor
2.83 GHz, 6 MB L2 cache, 1333 MHz FSB
Intel Core 2 Duo E8400 processor
3.0 GHz, 6 MB L2 cache, 1333 MHz FSB
Featuring Core 2 Processor with vPro Technology
Intel Core 2 Duo E8500 processor
3.16 GHz, 6 MB L2 cache, 1333 MHz FSB
Featuring Core 2 Processor with vPro Technology
Intel Core 2 Duo E8600 processor
3.33 GHz, 6 MB L2 cache, 1333 MHz FSB
Featuring Core 2 Processor with vPro Technology
希望以上回复能够对您有所帮助。