They (2) just arrived today... I also hedged my bet and ordered an Adaptec PCIE 4x 4port Raid card....
Flashing the boards was easy once I realised I had to disable the on-board Silicon Image controller... I'll try to attach a zip with the BIOS file and Flasher program...
Okay, as a baseline I have 6 Seagate 1tb drives, initially all 6 on the ICH8R motherboard controller.... Parity check at the 1% point was about 81 MB/sec. I moved the last two drives, one on each new card... wow... 87 MB/sec... reflects the reduced load on the ICH8R, and each of the two moved drives had it's own PCIE 1X lane... put both drives on one new controller... ooops down to 66 MB/sec... ouch... two drives on one lane ain't so good! Installed the Adaptec in the empty PCIE 16X video card slot (running PCI video).... put both drives on it... 92 MB/sec... I like it...
so......... I'm gonna leave it just like this.... I can put 6 drives on the ICH8R, 4 on the Adaptec, and one on each Rosewill for 12 drives, which goes with my 4 3in2 Kingwins
the other on-board connections will be for the Cache drive and my Slackware boot drive!
ciao....