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The Mac Pro is the most serviceable machine Apple makes. The 2019 and 2023 tower takes standard registered memory, PCIe cards and MPX modules, the 2013 cylinder uses proprietary but removable GPU and SSD modules, and the 2009 to 2012 tower accepts ordinary drives, cards and processors, which is why those machines are still in daily use.
The 2019 and 2023 Mac Pro use DDR4 ECC registered DIMMs across twelve slots, and Apple specifies matched kits installed in a particular slot order for full bandwidth. The 2013 cylinder takes four ECC DDR3 modules. The 2009 to 2012 tower takes ECC DDR3 in banks that depend on whether it is the single or dual processor tray. Filling the slots in the wrong order costs real performance even when all the memory is recognised.
On the 2009 to 2012 tower yes. The processor tray can be removed and the Xeon replaced with a higher clocked chip from the same generation, and on the 2009 model a firmware update to the 2010 version is needed first. The 2013 cylinder also has a socketed Xeon under the heat sink. The 2019 tower processor is socketed but Apple does not supply it as a service part.
Check the card is in a slot with enough lanes for it, that any supplementary power connector is fitted using the correct Apple cable rather than a generic PCIe lead, and that the card has Mac firmware where it is required. In System Information under PCI Cards, a card that shows as present but with a driver not installed is a software issue, while a card that does not appear at all is a slot, power or firmware issue.
Not sure which part your Mac takes? Send us the serial number and we will confirm the correct Apple part number before you order. Walk-ins are welcome with no appointment, and you can reach us on (813) 444-5595.