Thanks to Parkinson1NX who posted some essential info about the memory slots in a thread in the memory section (In small print at the bottom of the compatibility list of ram it says for better stability place the RAM in A2&B2) I am now running at XMP 3866mhz with the latest bios. I have not actually read the QVL list so have never seen that. It really should be in the manual!!
I have now moved my memory to slots A2/B2 and flashed the F9b bios. If I knew what frustration this was going to cause me for just over the next hour I would have left the damn thing alone!! The thing was I couldn't get the damn thing to even boot after the bios flash and it kept trying to switch between bios's. Why the hell Gigabyte don't give us a switch so that we can change between the two bios's is beyond me. It would make things a damn sight easier. Sometimes It would get to the post screen before locking up and rebooting. Sometimes I could hit delete on the post screen only for it to lock up and reboot. I finally got into the bios after clearing CMOS. As I suspected, it did wipe my saved profiles (next time I will save them to a USB stick Grrrrrrrrrr) so I had to get dirty in that bloody awful bios again. I set the memory profile to XMP, leaving everything else at stock for now. Back into a non-booting loop again!! Cleared CMOS again and after a few boot attempts got back to the bios where I decided to reflash F9b. Bios reflashed I cleared CMOS and got into the bios first time, yay progress. Set XMP again and checked the dram voltage to find it's not applying 1.35v anymore. Strange because it has with every bios version before this. I enter 1.350v and check other settings. Boot order is messed up as it's trying to boot from the USB stick that the bios was on and isn't even plugged in now. Saved my settings while leaving everything at stock again and finally got into Windows. Fired up CPU-z and checked which bios I was on and memory speed which was 3866mhz C18 so XMP is working now. I got my notebook out in which I have all my settings for 5Ghz written down and rebooted into the bios to enter them. Settings entered I cross my fingers and rebooted. All is well. I ran Aida64 to check bandwith and while Aida64 shows big increases in Read/Write/Copy/Latency by changing from 3600mhz C16 to 3866mhz C18 there is barely any difference in Super pi 1m and 32M while at 16M there is a 0.4 second improvement. I suspect this is due to the much slacker timings. I am just downloading 3dMark again (5.2Gb download
) and will do some runs to compare them to my previous ones. I will report back later.