I've been using the X370 Killer SLI (not the A/C model) for a couple of months now but am struggling to get my memory running smoothly at any speed.

I'm using:

Ryzen 5 2600 (stock)

Bios 4.7

Corsair 3000mhz C15 (CMK16GX4M2B3000C15 v5.39)

The problem I'm having is that the PC will always boot twice from a cold boot (and occasionally on restart) which is, I assume, due to AMD boot training on my RAM. I'vetried leaving everything set to auto, which sets the RAM to 2133mhz, I've tried running it on XMP 2666, 2933 and 3000 and I've tried manually dialling in 2133mhz with looser timings 16-18-18-38 at 1.35v with a bump of SOC voltage to 1.1v.

Whatever settings I use, the PC is stable once I'm into the OS, but will always boot twice. I've read that the issue can be down to boot voltage being set to 1.2v, rather than 1.35v, but my RAM runs at 2133 @ 1.2v without issue, so can't see that being the problem.

Anyone have any similar issues / solutions? 

Thanks

Sam