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As far as the mPCIe expansion, I'm not sure its speed; I assume it is SATA II. SATA III would require a third party controller and it's doubtful they could fit that in the space. What I do know is that, even if it's SATA II, you'll be doing better for overall system performance than any SATA III mechanical drive on the market.
Z77 can only support 2x SATA 3 ports (plus 4x SATA 2) - Reference chart. You had me worried for a second!
That being the case, it would require a third-party controller, right?
I was looking at the chipset diagram which says 6 x SATA "UP TO" 6Gb/s. Didnt realize there were only 2, but makes sense.
Anand has a review of a 6 Gbps mSATA SSD right here: http://www.anandtech.com/show/5735/micron-c400-msata-128gb-ssd-reviewConfirmation from ASUS:
There is no current MSATA solution on the market that supports SATA3 ( 6G operation ). Including ours overall this is a fairly mute point as the drive is generally intended for SSD Caching. That being noted we have validated with RunCore, Patriot, Kingston and others on large mSATA modules 120 and larger for normal boot / OS drive and normal SSD performance is present ( BOOT, Application launching, Copy Performance etc ).