Brand new hardware:
G.SKILL 16GB (2 x 8GB) Ripjaws V Series DDR4 PC4-25600 3200MHz Desktop Memory Model F4-3200C16D-16GVKB
ASUS PRIME Z270-A LGA1151 DDR4 DP HDMI DVI M.2 USB 3.1 Z270 ATX Motherboard
Intel 7th Gen Intel Core Desktop Processor i7-7700K (BX80677I77700K)
2 of Samsung 960 PRO Series - 1TB PCIe NVMe - M.2 Internal SSD (MZ-V6P1T0BW)
Cloned install of Windows 10 from previous system (off a LSI Megaraid 9265-8i w/ 8 OCZ Vertex 4 256G drives in a RAID-0) otherwise identical hardware.
Once booted the system runs fine, benchmarks show between 3 and 4.5 gigabytes per second read speeds and average seeks of 0.075 ms. However, herein lies the MAJOR fly in the ointment, booting. It takes a good five-ten minutes to boot on this system. It's like a something severely limits the throughput until some point in the boot process is reached. Once that point is reached performance easily multiplies by 100 times if not more. While this performance hit is in effect Windows is completely unresponsive, even ignoring ctrl-alt-delete. The drive activity LED remains lit solid with an occasional flicker. Then whoosh everything happens at once in about a second and all is well. I've found multiple post citing this exact same behavior which appears to have been introduced with RST driver version 14, version 13 not having this problem. The unfortunate issue is only version 15 supports this new hardware, anything older doesn't even recognize the RAID or drives. The driver installed is the one provided by Asus, The motherboard is running the latest BIOS (0906 released 3/24/2017). I also tried the driver directly from Intel, same version number, both behaved in exactly the same way. When I attempted to install 14 (with plans on going back to 13 if that didn't fix the problem) it rendered Windows unbootable and I had to recover by booting off my older LSI raid and copying the newer driver files across. I've attached the SSU report. I should add that I made the mistake of power-cycling at one point trying to figure out what was going on and it all but destroyed the file system, completely corrupting the Windows start menu and a large number of files, the entire amount of damage is unknown but file repair found approximately 4 gigs of orphaned files. I intend to re-clone from my LSI raid (which may be slower but at least it WORKS) and go from there. Given the LSI hardware does not have any of these problems with all else being equal this would suggest the problem is with Intel RST or possibly Asus. Any help/suggestions would be most appreciated.
SSU report.txt.zip 36.6 K