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There are different variables to consider here since you have different configurations not only in the RAID modes but in hardware specifications.
Was the performance degrading or always like this since the fresh Windows* installation? I see you have different brands of SSDs. Are the SSDs specifications regarding transfer rate similar? I did not fully understand, are they both Intel® P67 Chipset?
It is possible the SATA controller is not providing TRIM to the SSDs in RAID. TRIM in RAID is supported starting with Intel® Z77 Chipsets.
If you had identical systems it would be easier to compare the different RAID modes but still, for a striped array the booting time is very slow, it should be way less time. Hence, my thinking tells me that there is something related to the SSDs (in RAID) causing the issue. I may suggest testing with a single standalone SSD if possible.
Many thanks Joe. As I wrote in my original, the supposedly slower computer uses ESB2. It's XEON based. Interestingly, since posting, I've upgraded the 2GHz 2-core processors to 3GHz 4-core in the older ESB2 machine and it's slowed down boot time to log-in by 2 seconds! Apart from that, it's lightning.
There's something else at play here so I'm sorry for wasting your time. In the Windows performance index thingy the newer computer with the slow boot time reads 7.9 for disk transfer rate. I didn't think to look before I contacted Intel.
It's clearly a Windows or Bios issue since I regularly use a start up manager to disable everything apart from absolute essentials.
Thanks again. Great support service! Cheers, Martin