KR0SSED0UT

Unfortunately no dice here either -- if I put PRIME-X470-PRO-ASUS-4207.zip and PRIME-X470-PRO-ASUS-4207.cap both on a freshly formatted USB drive, only the .cap file shows up. If there's a way to flash in the BIOS using a .zip file I must not be aware of it.

Unfortunately, after several attempts, I haven't been able to get the board to read an older BIOS file whatsoever. Just gives me the message "the selected file is not a proper BIOS." Doesn't look like this particular x470 board supports BIOS flashback. Looks like I'm stuck with random BSODs for now...

I wasn't aware that the x470 Prime-Pro board supported BIOS flashback, I'll try this later today and post back with my results.

Me and a friend are having the exact same problem as you -- both with the same motherboard. It's clearly a motherboard issue -- on the latest BIOS as of time of writing too (4602, came out 3/25/19) Both me and him are running NVME SSDs which tells me that it's more than likely related to that more than anything else. All this leads me to conclude that it's just kind of a shitty board -- maybe ASUS will fix this in a BIOS update, maybe not, who knows.

It was the PSU. Had a friend bring over his identical (sans newer) CX750M, plugged it in (using the same modular cables, obviously the mobo and CPU header were different) and it worked perfectly, absolutely no throttling issues. Pushed it for over two hours and we saw absolutely zero instances of the issue pictured, as opposed to it happening every 15 minutes or so. I have ordered one of these. It will be here in two days. The moral of the story is that YES, power supplies can fail in such a way as to bottleneck the GPU and YES, it can be easily diagnosed by swapping power supplies.

but can we draw any conclusions from the attached image on a power supply failure? I really need to figure out what's going on here.

Do you think I need more than 650W? I've done some research and I should be able to get by on even 650w. I was looking at this: http://www.newegg.com/Product/Product.aspx?Item=N82E16817438054

No, it runs at about 7-15fps, frametimes jump from 15-17 to well over 100ms. Then it goes right back to normal.

FX-8320 @4.5ghz. the overclock is extremely stable and I've never once had a problem with it, stability or temperaturewise. No, it only seems to happen in games like BF4, SW:BF beta, and especially GTA V. It's also been happening more and more lately.

http://i.imgur.com/i5RuXiT.png This has been happening for a couple months and I should have addressed it sooner. My EVGA GTX 970 4GB SSC drops to 0% usage in CPU + GPU demanding games (GTA V and, most recently, the SW:BF open beta) for about 10-30 seconds. You can see the three sudden drops in the graph and that's what those are illustrating. (this is while playing the SW:BF open beta at 1080p 60fps.) After that, it immediately recovers and stabilizes and goes back up to 60fps. To ME, it looks like a failing power supply (CX750M) but I'd like a second opinion before spending ~$100 on a new one.