Well, I'll provide some shot-in-the-dark suggestions, because why not. I've had this problem too.
I've encountered this problem before as well and it was because of a bad CPU overclock. Not even a manual one, but one of those "auto" ones that some ASUS boards do. I'm not sure if yours does anything like that, but it's something to check.
I've also solved the same problem (different computer) by taking all the ram out, shuffling it ( as in not putting the same stick in the same slot, no joke) and re-seating all the sticks and making sure they're in there good. For some reason it worked even though memtest worked fine before. Might be worth a try.
You can also try a different PSU/check ALL PSU connections- unplug and re-plug them, don't just do the wiggle test. Also check for any extra connectors needed on the MB, I know some ASUS ROG boards require an extra 4-pin and molex connector to help power the board fully.
You can clear the CMOS (you have probably already done that, but sometimes the simplest things are what slips through the mind in frustration).
You can re-seat your CPU & GPUs. Sounds weird, I know, and a pain in the ass for the CPU but I have heard this can work. At least try the GPUs.
Take one of your GPUs out, run some stuff/whatever to see if you get the error. If you do, try the other card by itself.
Last resort- Take EVERYTHING out except the CPU, OS HDD/SSD, and one stick of RAM. Run off the integrated graphics. See what happens.
I don't really know for sure what causes this error, but if you see something above you haven't tried, I'd say go for it. Better than sitting on your hands in frustration.
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