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2 Samsung SM951s on 1 M.2 PCIe Adapter?
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What you want would limit these drives severly: PCI-e 2.0 x4 has a max throughput of 2000MB/s. All of these expansion cards are x4 based. And I haven't seen any where a second M.2 card doesnt need a SATA cable or a PCI-e riser cable. Would be nice if there was a x8 expansion card indeed 
One good 1TB unit
and isn't there an even larger 2TB blade on the near horizon? The need for distinct separate devises because ____ ?
What you want would limit these drives severly: PCI-e 2.0 x4 has a max throughput of 2000MB/s. All of these expansion cards are x4 based. And I haven't seen any where a second M.2 card doesnt need a SATA cable or a PCI-e riser cable. Would be nice if there was a x8 expansion card indeed
Yes, BUT - I believe there would still be a problem on a cMP. It appears that those 4 lane cards are restricted to half speed or 2.5GT/s (in slot 2, the 16 lane slot) rather than the full 5.0GTs you get in slot 3, the 4 lane slot). I would suspect an 8 lane card would have the same limitation.
http://barefeats.com/hard200.html
Lou
O yes, you're right indeed, so even if a hypothetical 8 lane card exists this wouldn't be the solution you're hoping for.
Going for one large unit seems to be a better choice!