4 DIMMs is optimal on the Z390 Aorus Master because it has a T-topology memory layout. Do note that the Z390 Aorus Master has a training issue above 3900 MHz memory speed, leading to worse performance in several cases unless you reach a really high memory speed like 4266 MHz or higher. My recommendation is to aim for 3866 MHz, and after that you start tightening down timings.
...According to the Hardwareluxx.de (and also given the stock primary timings), F4-3466C16Q-32GTZR is not Samsung-B die. Still, try to set '14-14-14-32' / 3400 MHz at 1.4v or below for the primary settings and see how that works via RAM stress testing.
I realize that you're not running Ryzen but Intel, yet I have used <> this tool as a 'dial-in' guide even for Intel based machines.
4 sticks are usually harder to 'oc' than 2 sticks, but it also depends on your CPU's memory controller bin. For example, I can run 4 Trident 3866 sticks at 4000+ on a 6700K w/o issues. Temp wise, I like to keep the DRAM sticks in the 30C range (ie with auxiliary fans if necessary, depending on case airflow), but definitely keep them below 50C
...re OC, you need to do stress testing (memtest and various other). Re. temps, they're a bit on the warm side at 48C but not in outright danger territory. Still, I would add an extra fan blowing air on the DRAM modules (which also helps with VRM etc)
Well i got a BSOD in game. I went back to XMP profile 3466 and noticed the temps are quite similar than at 3733.
Could it be the timings or maybe the cpu vcore which needed to be upped with the ram oc?
In red dead redemption 2, rams hitted 52c.
You need to stresstest your memory, use either Karhu, HCI, or testmem5 w/ anta777 config. Just setting random timings and clock speeds will never get you anywhere, be systematic and loosen out primary timings to find a maximum clock speed before trying to tighten timings.
3466 16-18-18 isn't a particularly good bin, but you should at the very least be able to tune the subtimings. It's probably Samsung B-die as tRFC ~300 @ 3733 MHz on Hynix CJR shouldn't be anywhere close to stable, but that doesn't instantly mean you are able to run tCL, tRCD/tRP, tRAS, and tRC at similar speeds as good bins of Samsung B-die.
You should lower your CPU and Cache/Ring OC while trying to find stable memory timings, the reason being that the increase in performance from memory timings might very well push your CPU over "the edge" stability-wise. Just go 200 MHz down temporarily, then try to raise it after completing the memory OC.