Hello,
I'll try to be as concise as possible and this is an overclocking issue
that I haven't found a reasonable answer too. I am hoping the problem is a
general one that applies to many systems rather than a hardware/brand
specific one.

System is homebuilt, nforce2 motherboard(GA-7NNXP) with AMD mobile 2600 cpu
overclocked to 2476 MHz by a combination of multiplyer (12) and front side
bus set at 206.33. All is pretty stable at this point except RAM.  Main boot
drive is twin, 37 GB, Western Digital Raptors (10,000rpm) in RAID 0 using
Silicon Image 3112R, onboard controller. (the latest sil3112r driver hinders
performance (as per tests Hard drive Tach v.3.0.1) and does not correct the
problem so I use an older driver) MB BIOS is most recent. RAM is Geil, 1.5
GB, 400MHz with lots of errors (Memtest86#5 test) at any FSB setting above
200 MHz. PCI and AGP stay locked at 33 and 66 MHz respectively, reguardless
to FSB frequency.

Hard drive corruption occurs at FSB settings over 207 MHz. Why is this? Is
it the RAM? Reviewers of this Motherboard said they got 235 MHz FSB but they
were not using SATA RAID. So where is the problem? What does the SATA RAID
3112r chip run at (frequency)?