NickDaGeek

"Did you try slots A2/B2 for two sticks? This is the recommended configuration." yes I did try that as well currently working on setting memory frequency manually not Auto which seems to be helping anyone know what "Memory Scrambler" is in the Asus Bios?

have run several tests since my last post. 32GB 4 DIMMS Under Clocking does not have any effect at all. 4 dimms = death.:evil: 16GB 2 DIMMS Slots A1 and B1 (two black dimm slots) (note this is an Asus QVL approved combination of Corsair and configuration) it works and can overclock (XMP Profile#1) but ASUS driver IOMap64.sys is not stable and with Microsofts Driver Verifier set to on it blue screens. Then took the overclock off (XMP Disabled) and it still blue screens. Removed IOMap64.sys and all other Asus AISuite 3 drivers. Also had to take out Gigabytes OCGuru Driver as MS Driver Verifier killed that on start up for similar reasons. Basically the Manufacturers software violates MS Ring Fence on memory access as it bypasses the OS as far as I can see. I have to agree as two indpendent processes writing to the same memory area are going to get it wrong at some point and hit the same address. A lot better but STILL NOT STABLE. Tests (OCCT) now run to completion but cause BSOD on exit or lockup Games are the same (Dirt, Counter Strike) CTD. 16GB 2 Dimms Slots A1 and A2 (one black slot and one grey slot) Aha! :bigeyes: things are looking better, test runs fine and I can escape and stop without BSOD or lockup. Both Counter Strike and Dirt run (I am still crap though :[pouts: LOL) OK so here's the skinny, Asus z170-K on latest bios using a QVL configuration of 16GB Corsair kit DOES NOT RUN STABLE (yes its a kit not a pair of individuals I put together. Work Around: Disable the dual channel memory feature by putting the DIMMS in different channels i.e. one black one gray slot (the first two nearest the CPU. ASUS care to comment? Corsair you may quote me to ASUS and I would be pleased if you did. This is not funny from my, or your, point of view. Even their QVL memory and configs do not work on this board.

As far as I can determine having found this and several other threads there is a major issue with using all 4 dimm slots even if the memory is on the QVL. There is a set of three columns to the far right of the z170 memory QVL that says "Dimm Socket Support (optional)" and includes single dimm double dimm and quad dimm. First optional it is not!!!! Second it has a disclaimer at the bottom of the QVL " 4 DIMM Slots • 1 DIMM: Supports one module inserted in any slot as Single-channel memory configuration • 2 DIMM: Supports one pair of modules inserted into eithor the gray slots or the black slots as one pair of Dual-channel memory configuration • 4 DIMM: Supports 4 modules inserted into both the gray and black slots as two pairs of Dual-channel memory configuration " I do not recall seeing this in earlier versions of the QVL for this board but I am certain from my own testing of the system on my workbench that it is anything but "optional" if the damn thing is on the QVL and does not have a dot in the 4 dimm box its as unstable as a drunk on a tightrope and about as safe. In a nutshell above DDR4 2800 the current Qualified Vendors List (QVL) says the board DOES NOT SUPPORT 4 DIMM configurations from 16GB to 32GB with very few exceptions.:evil: As the whole point of the z170 chipset was to increase memory speed and size for the 64bit OS/Chip combination this is pretty negative and ASUS' new T-Topology has not worked. :(: I am wondering if underclocking my 32GB of corsair will allow it to work in 4 DIMM mode or if there is a way of disabling the banked interleaving on the Grey and Black Sockets? Any and all suggestions gratefully accepted :D: