Ok so I did the following:
Updated bios and AMD chipset to latest. Disabled virtual memory paging thing in windows. Set power settings in windows to ultimate.
Bios was an old one from beginning of 2019. Settings looked very standard but weirdly ram was put to run at 2133mhz. CPU was around 3.2ghz.
This is PC spec:
CORSAIR RMx Series RM850x 850W
ASUS PRIME X399-A
Samsung 970 PRO MZ-V7P512BW - 512GB - PCI Express 3.0 x4 (NVMe) - M.2 Card
ASUS ROG-STRIX-RTX2080S-O8G-GAMING - NVIDIA RTX2080Super - 8GB GDDR6 - PCI Express 3.0 x16
Noctua NH-U14S TR4-SP3 processor-køler
CORSAIR Vengeance LPX - 128GB: 8x16GB - DDR4 - 3000MHz - DIMM 288-PIN - CL16 - Bulk
Fractal Design Define R6 USB-C Black
AMD Ryzen ThreadRipper 2990WX / 3 GHz Processor
I followed this guy's OC settings:
but put in 3700mhz on CPU as I thought this would be a bit safer.
Corona benchmarks is around 43secs, but the real action happens in my scenes from yesterday regarding rays/s:
4k scene rendered yesterday w. 2.1mil rays/s total
Today after tweaks: 4.7mill !
Scene in 1800px from yesterday was at 3.2mil and today 5.7mil! Overall system responsiveness also seemed better while rendering and I was very happy. But then I wanted to open Photoshop to see how resposive that would be (as we have had very laggy performance in there while rendering), but when I opened PS = blue screen with a "sorry windows ran in to a problem and needs to reboot :("
Temps seemed okay hovering around 68degrees when rendering. You think it could be memory? I've just put them down to 3000mhz now and will try render same scene and open PS again.