Can you downlclock your RAM, the single rank stuff, to stock speeds and see what happens?
RAM speed is tied to a bunch of other things for Ryzen (SoC, infinity fabric, which links to a lot of other things, such as PCI-E). If your SoC is unstable at higher speeds and can't latch at PCI-E 3.0 speeds (8 GT/sec), it may back down to PCI-E 2.0 (5 GT/sec). PCI-E devices will negotiate to the highest possible speed that both host and device can support, and if any issue arrises from either hardware incapability, or issues with signaling, it will negotiate to lower gen speeds and/or less PCI-E lanes (using a riser with bad shielding or long cable can cause lower pci-e gen speed)
Off topic, but from the new announce of infinity fabric speeds for ryzen 2, memory support will be better. ryzen 1 infinity fabric is 10.7GT/sec, or memory frequency x 8. mem freq is stated to default to 1333MHz (DDR 2666) for ryzen 1, so 1333MHz * 8 = 10667MT/sec, or 10.7GT/sec. Ryzen 2's IF will be 16 x mem freq, or 25.6GT/sec. Putting in some substitution math, that's default memory speed of 1600MHz, or 3200MHz DDR right out of the box with no problems.
Intel Core i9-9900k (Silicon Lottery 5.1GHz @ 5.3GHz 1.36 VCore)
ASUS ROG MAXIMUS XI APEX
G.SKILL F4-4000C19D-32GTZSW (2x16GiB 4000MHz 19-19-19-39 2T, tuned to 4133MHz 14-17-17-31 2T)
EVGA NVIDIA GeForce GTX 1080 Ti FTW3
Seasonic PRIME 1300W 80+ Platinum
Last edited by ssateneth; 04-10-2019 at 09:11 PM.