This is three 128GB OCZ Vertex 4s (GPT format), empty drive, on an ASRock Z87 board, Windows 8, IRST 12.5, 64K stripe (best results with this SSD):
To the others that have posted benchmarks and are using IRST 12+, have you configured all the options for performance in the IRST Windows UI?
By default, DIPM (Device Initiated Power Management) is enabled, but should not be an issue on desktop PCs.
IRST 12 also has SATA controller power management, which can be switched off, but should shut off as soon as the benchmark starts.
If you don't enable, disabling
write caching in Windows (yes, activate turning something off, no wonder that is confusing) in the IRST UI itself, the caching mode is set to Read Only and cannot be changed to Write Back, the preferred setting.
Yes, I have done all of these things with the result above. Two Vertex 4's in RAID 0 on SATA III ports tend to stay below 1,000MB/s sequential read speed, so my result is not all caused by the limits of the SATA interface and/or IRST driver.
Frankly, this result is only fairly better than two of the same Vertex 4's on a P67 chipset board with IRST 10.8, Windows 7:
So we've seen results from Gigabyte, ASUS, and ASRock Z87 boards. IMO it's looking like these results will be typical for 3+ SSDs on a Z87 board. It's not your mistake. Is this a hardware or buss speed limit, or RAID driver that can't keep up? CPU usage is very low during the benchmark run. My bet is a buss limitation, like the Marvell SATA chips using one PCIe lane at 5Gb/s max.
OMG are we spoiled, we are disappointed with this result (believe me, I get it...) Hmm, can I scrape up three SandForce SSDs to try... which usually score poorly on AS SSD."You are another victim of Intel RST enterprise drivers for X79..."
Ha! That sounds like something I would say! True, but not funny for that person, I'm not laughing at you at all, just the comment.
Here is an example of a driver making a big difference, although in the opposite direction. The IRST driver will improve on that score substantially, so can it be improved even more?