Am looking to purchase a ~ 

Toshiba OCZ RD400 Series Solid State Drive PCIe NVMe M.2 256GB with MLC Flash (RVD400-M22280-256G)

Will do on both counts....tho at this point we will have to see who is faster....Asrock on the reply or Amazon on the shipping  

Torak wrote: Am looking to purchase a ~  Toshiba OCZ RD400 Series Solid State Drive PCIe NVMe M.2 256GB with MLC Flash (RVD400-M22280-256G) i am seeing it is  NVMe Protocol (PCIe, Gen. 3 x 4) and my 990 fx extreme6 has a 1 M.2 (PCIe Gen2 x2 & SATA3) bios vers 1.40 adds M.2 and NVMe support... will this work?...work but not as fast as advertised?

This is not so hard to figure out, if you have some experience with PCIe NVMe SSDs.

The OCZ RD400, as most NVMe SSDs, need a PCIe 3.0 x4 interface to get their optimal performance.

The AMD 990FX systems provide support for PCIe 2.0, which is 5Gb/s per lane. PCIe 3.0 is 8Gb/s per lane, with less overhead in the data transfer.

The M.2 slot on your board is both a PCIe 2.0 x2 interface (two PCIe 2.0 lanes), and can be used with SATA M.2 SSDs.

The RD400 requires PCIe 3.0 x4, four PCIe 3.0 lanes for optimal performance. So the M.2 slot on this board will have at best 50% of the performance of a full PCIe 3.0 x4 interface. It will be a little less than 50% actually.

There are M.2 to PCIe slot adapter cards that can be used with M.2 NVMe SSDs. You could use one of the adapter cards in the PCIE3 or PCIE5 slot, and provide a PCIe 2.0 x4 interface to the RD400. But since the interface is PCIe 2.0, you won't get the full performance of the RD400.

All of this applies to any mother board, AMD or Intel, depending upon the PCIe support (2.0 or 3.0), the PCIe lane allocation to the M.2 slot, and the available PCIe lanes in the PCIe slots.

parsec wrote: This is not so hard to figure out, if you have some experience with PCIe NVMe SSDs.

Says you. Is there any drive interface you haven't thoroughly run through the ringer there yet?

parsec wrote: There are M.2 to PCIe slot adapter cards that can be used with M.2 NVMe SSDs. You could use one of the adapter cards in the PCIE3 or PCIE5 slot, and provide a PCIe 2.0 x4 interface to the RD400. But since the interface is PCIe 2.0, you won't get the full performance of the RD400.

That's what I thought. Thanks for the clarification parsec.

...or more if i go the add in card route. Reason for wanting to go the M.2 is more based on plans for building a custom clear desk/case ala the Lian Li DK-01. No sata ssd's = even less wires to manage