can you use a pci 3.0 card in a 4.0 slot: Sony a7III Dual Card Setup Guide - Alpha Shooters. 2 Slot Graphics Card Width - ms.codes. PCI Express X16 vs. X8 vs. X4 vs. X1 Slot: Difference, Use & Compatibility ... .
And don’t forget that the Canon EOS R has a single SD card memory card
slot, so you can use two memory cards (it’s not a requirement to use two, but there are benefits; more on this below).
Yes, you can use a graphics card from a different brand than your motherboard, as long as the card is compatible with your motherboard’s
PCIe slot and power supply requirements.
PCI and PCI-X are not directly compatible, and you’d be forgiven for thinking that means you’re out of luck if you need to use a PCI-X card in a machine that only has basic PCI
slots.