XigmaNAS

I just bought 5 Seagate NAS HDD 4TB ST4000VN000 and have a few doubts on how to prepare the NAS4Free system.
1) Is it a bad idea to use the motherboard SATA connectors ? Most Motherboards have 2 different SATA controllers, some are SATA3 (6GB) and some SATA2 (3GB).
2) Is it possible to relocate the disks to an IBM M1015? Is it easy to do it? Is there any advantage or should I do it only if I need more drives?
3) Are the board available on ebay for $120 and up (Search IBM M1015) the correct boards to buy? Will they accept cross flashing to a LSI9211-8i in IT or IR mode?

Thanks in advance for any help provided

1) In general no, but come motherboards have compatability issues. intel boards should be fine though.
2) Yes. but flash the m1015 to it mode first.
3) Should be

should be.....

99% of the hardware I try works fine with N4F but there is that pesky 1%
everything seems to have some idiosyncratic behavior, usually not important.
except when it is important to you. yes some MOBO skimp with the faster ports
relying on the expansion buss or on board 3GB SATA is something I would test for best results.

Thanks for the help. I am going to use the LSI9211-8i