Compatibility details for PCIe 2.0 and PCIe3.0
Compatibility details for PCIe 2.0 and PCIe3.0
I've seen on forums that PCIe 3.0 should function on a PCIe 2.0 board. But I'm having trouble getting it to work. My motherboard is an Asus M5A99FX Pro R.2, and I've used several PCIe 3.0 graphics cards without success—none have booted up. I'm mainly interested in the best card for watching videos, not gaming. If anyone knows what might work, it would be a huge help. If someone has an experience with a compatible card, I'm willing to pay a fair price. I'm also using an Asus Radeon HD 7750, which is still operational. The Sapphire Radeon HD 7770 didn't work either. Mrob27R
Are you certain the issue isn't related to PCIe version compatibility?
Could you share the full specifications of all installed parts?
What is your current spending plan? You don’t need cutting-edge gear just to watch videos.
I assembled it myself
Asus M5A99Fx Pro R2.0 motherboard
amd FX 4350 Quad-core processor
bios is current
650 watt power supply
16 GB memory
windows 10 pro x64
currently functioning without issues, it has been reliable for years. Recently purchased a new R9 270, but failed to boot. The board supports VGA and PCI Lite. The PCI red light illuminates. Inserting the sapphire Radeon HD 7770 (used) powers on the PC, though no video output appears. I paid $200 for it, expecting a similar price.
For further details, feel free to ask. Thank you.
Power Supply rated at 550w, believed to be 650w, Thermaltake
Mod. # SP550AH2NCB-A
What video issues are you encountering with your Radeon HD 7750?
For video playback, a more powerful card isn't necessary.
I'm not experiencing any issues. The 7750 is around eight years old, so I considered getting something more recent. Initially, I tried the Radeon HD 7770, but it didn't work—no video output and PC boot failures. I suspect a PCIe version compatibility issue. The 7750 lists PCIe 2.0, while the 7770 indicates PCIe 3.0.
PCIe supports both forward and backward compatibility, provided the motherboard's BIOS and slot hardware can interact.
In practice, a PCIe 5.0 card might work in a system using only PCIe 1.0/1.1 if the 5.0 components can communicate with a non-UFI BIOS.