OCZ 2 in raid 0 max speed 350?????

what do you mean your max with 2 is 350 should be 400 plus? and what are you doing please explain?

do you mean max 350MB transfer rate?write rate? read rate? 350Mb? 350MB? GB? 350ms? (I know some of the examples are rediculious but I hope you get what I'm trying to say, you could be trying to say anything with just numbers)

its hard to help when you don't explain it very well.

Sata 3.0 can handle 3Gbit/s per controller which is about 375MB/s MAX, which if you are talking about 350MB/s transfer rates is about correct.

3Gbps = 300MB/s with 8/10 encoding; just like PCIe 2.5Gbps = 250MB/s.

You are running two SSDs in RAID; meaning you do not have TRIM support. Did you anticipate this and create a smaller partition on the RAID than the full capacity? Can i see your partitions?

Without special treatment, SSDs in RAID will become slow since the disk is getting 100% full; you should never allow an SSD to get that full.

The only remedy is secure erase on both SSD and setup RAID again (if you still want to). You would need to create a partition smaller than the full capacity; thus if 120GB is the full capacity you create a 100GB partition and leave the 20GB unused; meaning 10GB reserved space per SSD; on the low side you may wish to double this.

sata 3 can do up to 600MB/s...
each hdd/sdd has its own sata controller, bandwidth will not be shared.
if the ssd is capable of reading 250MB/s, raid 0 would make it reach up to 500MB/s in theory, so even if u only have sata2, this won't be a problem.

Really necessary to resurrect a thread just for that? The OP never responded, so this better die along with the other unfinished threads.