R5 3600+B450 Mortar is compatible with RTX 3080.
R5 3600+B450 Mortar is compatible with RTX 3080.
At 3600 it looks like I'd be closer to the 3070 specs. Of course, a 3080 might work, but it could create a performance bottleneck. Sure, a 3080 would likely outperform a 3070 in your setup, but probably not by around $200 more FPS. The 3070 should beat a 2080 Ti, which is already a decent deal on its own. We'll see the results later.
Your concern is valid. The presence of both PCIe Gen 3 and Gen 4 in your board means compatibility depends on the specific requirements of the device you're planning to use. Check the manufacturer's specifications to confirm what version is supported.
It shouldn't be a problem. The main concern will be the power supply. Do you have a solid 750-watt unit? That would be great. If not, a 650-watt setup with a 3600 MHz processor should work. But aim for at least 650 watts. Also, I’d lean toward the 3070. You might be spending a lot on a 3080 with a 3600 CPU, but let's wait for benchmark results before making a decision.
Yes, you can use the 3080 with PCIe Gen3 on your Silverstone ST75F-GS 80+ Gold 750W setup.
It should function properly without saturating the x16 gen 3 lanes. The 3600 seems capable of handling a 3080 at higher resolutions, though performance may vary. Keep an eye on ampere once it launches and observe the 3600's behavior with the 3080. What power supply are you planning to use?
As I mentioned, everything should work properly, but please wait until the ampere starts up before testing. Also, verify the performance and see how the 3600 handles with the 3080.