I have a Plextor PX-G256M6e M.2 PCIe Internal Solid State Drive that I can't get to run faster than sata3 speeds

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ASRock Fatal1ty 990FX Killer AM3+ AMD 990FX 5 x SATA 6Gb/s USB 3.0 ATX AMD Gaming Motherboard

Plextor PX-G256M6e M.2 PCIe Internal Solid State Drive

2 - WD Green 2TB Desktop Hard Drive: 3.5-inch, SATA 6 Gb/s in Raid0

PNY optima 240GB SSD ( This is sitting 'Idle', so to speak. It is a boot drive I used when the M.2 wasn't running stable. It has a mirror copy of the Windows 8.1 that is running on the Plextor right now.)

Cooler Master HAF XB EVO - High Air Flow Test Bench and LAN Box Desktop Computer Case

CORSAIR CX series CX750M 750W ATX12V v2.3

AMD FD8350FRHKBOX FX-8350 FX-Series 8-Core Black Edition Processor

Corsair Hydro Series Extreme Performance Liquid CPU Cooler H100i

ASUS R9270X-DC2T-2GD5 Graphics Cards R9270X-DC2T-2GD5

ADATA USA XPG V2 Series 16GB DDR3 2400 PC3 19200 (8GBx2) Kit AX3U2400W8G11-DMV





Those are screenshots from the manufacturers' tool kit I downloaded.

First, I should say that I had this drive for months, and it was never stable. It would cause crashes constantly. I almost memorized my windows product key code I reinstalled it so many times. Finally, I threw 240GB PNY SSD in, loaded Windows 8.1 onto it from the same Microsoft Disk, and it ran flawlessly. I had abandoned the idea of even returning to the M.2, but something about the thought of a near two hundred dollar SSD collecting dust didn't sit well, so I started digging, again, for knowledge on the subject. I found a bit of information pertaining to Uefi settings that seems to have provided some stability. It was in Storage configuration> sata Ide combined mode. I had to disable that, so said the motherboard manufacturer, and it has been stable for a few days. I also installed new firmware from the SSD manufacturer today, though it hasn't changed speed, I hope it helps in the long run as release notes mention improved performance on my brand of motherboard. While I am pleased to have the thing working, I would like to see the sort of speeds advertised by the motherboard and ssd manufacturers, or at least something more than sata 3. Any advise is greatly appreciated. I know just enough about computers to get myself into trouble, and out of only half of it.