Then there's the fact that just because you get a 6G rated eSATA enclosure?.. doesn't mean that bridge chip won't slow down the internal ports connection speed either.
Which is why I explicitly said to physically mod the enclosure such that the SATA cable from the mobo connects directly to the SSD and bypasses all enclosure nonsense.
Those bridge chips on enclosures are actually known to slow you down.
I know of no other 3rd party chip mfgr aside from Marvell's newer 9187 chip(and another version I can't remember right now) that will support a faster 6G SSD(due to x2 PCIe lanes being used).
I did say to use the built in intel port.
Furthermore.. the ONLY way that I know of to run an SSD externally of a PC while connected to an internal Intel 6G port would be to use a long ass power cable and sata3 data cable to get it sitting on your desk. That would bypass the need for any enclosures bridge chip but hardly be considered an external enclosure though.
Mod an enclosure!
It is really really simple
1. Buy an enclosure.
2. Remove the internal SATA cable from the enclosure. (If its power supply is not integrated into the circuit board then remove the entire circuit board while you are at it)
3. Cut/drill a hole in it big enough to thread an eSATA cable through.
4. Place an SSD in the enclosure connecting it to the power cable from the enclosure and an eSATA cable which you thread through the hole you cut for it.
5. Plug the enclosure power cable (the one it came with) to the wall. Plug the eSATA cable you threaded out of the hole you cut to the mobo's intel internal SATA 6G ports using an internal to external SATA convertor as the one I linked
The end result is that power comes off of a mini power supply (from the modded enclosure), and data is done via (intel mobo plug) <> internal to external converter <> eSATA cable <> SSD drive.
No extra junk in the middle to slow it down... I tested internal to external convertors and they didn't slow down any since they are just a dumb cable with a slightly different shaped connector at the end. but you can verify that by bypassing them too and threading the cable into the PC via leaving an open bracket slot in the back.