Hello, regarding the performance issue that you are experimenting right now, unfortunately we do not have any recommendation so far regarding the trim issue using RAID so far because this is a hardware limitation within the chipset.
It took 2 months for that reply --lol
Hello... can't really say what is going on here, maybe your system is not quite as fast as mine, but my two X25M's in RAID0 are performing very well. I can show you a shot of today's CDM run and one from July of this year. You can see there is little to no degrading of drives to speak of. (get latest version of CDM... 3.0 I believe).
7-27-10 (X25M X2)
10-6-10 (X25M X2)
I am running RAID0 on an EVGA X58 Classified board, Core i7 @ 3.8GHz, two GTX 460 SLi, 10gb RAM on Win7 Pro x64. I can say on a fresh install the first thing to do is download and install your Chipset drivers (latest version) and latest Intel RST software (enable write-back cache.... important for SSD's, also disable Windows Defrag).
Also, try browsing the OCZ SSD forum (I know, they are not Intels) but very useful info and many guides are found there concerning SSD's in general. I found them very helpful.
It is great to see your performance has increased. I myself had the LSI 9260-4i, but sent it back. I learned a hardware RAID card is not necessary for only 2 drives. You will only realize true performance of the card with 4 or more drives. The Intel onboard RAID (ICH10) is more than capable when only using 2 drives. Are you planning on purchasing more drives in the future? These X25M drives are certainly the way to go. I have thrown a lot at these drives and they are rock solid.