Originally Posted by rx7speed
so just to make sure with sata speeds are they per specific port or for the whole sata controller?
reason I ask is I have the built in ICH9R controller. with both my 4x250 setup with each drive capable of around 110-120mb/s max speed when all four are in use it seems to peak though around the 300mb/s mark. same thing with my new 2TB drives which do damn near 200mb/s max on their own but yet with 2 in raid zero I still get around the same 300 mb/s max speed out of them.
Most of your questions are answered in the post right above yours.
You've got an Intel board? I don't know what sort of throughput they have. It could be the SATA controller is maxed or its link to the CPU is maxed. I had an old nVidia board a few years ago that attained about 350-400MB/sec in RAID, but at the time most boards capped out at 250-300MB/sec. Intel made waves with their first board that could push through 500MB/sec. Then AMD got their butts in gear and made most of theirs capable of somewhere up around 2GB/sec. With modern AMD boards, you can nearly use every port fully. I don't know if Intel ever did the same.
Anyway, your board is a bit older, so you should be maxing out somewhere between 300-500MB/sec depending on when it was made? I don't keep track of exactly how much data a given Southbridge/SATA-controller can push, but maybe you can find a similar setup in the HDTune thread?