Hi,   i see only 1 here [URL]   PCIe SSDs are not validated on the T20. You may be able to get it to work, but it would not be supported. You may not be able to select the PCIe SSD as a boot device.   Network cards that was tested by community:  
I have to upgrade a customer's Dell Power Edge T20: Many thanks - Michael
Upgrade to Dell Power Edge T20