poor raid performance

[phoenix]

I have a question on raid scores in Sandy. I originally had 2 dma 100 Western Digital HDD's in Raid 0. First Benchmarks were in the 38000 range, but the next day went down to between 230000 and 27000.
Flashed Bios and added a 3rd HDD to see what would happen. Got scores in the 44000-47000 range originally, but they went down to 27000 the next day and stayed there. Any ideas?

Abit kt7a-raid
A7 1200 @1333 (10x133)
2wd 20g hdd's + 1 Maxtor 20g at Raid-0
1 60gig Maxtor (storage, not Raid)
256m pc 166 ram
TDK burner
32meg Radeon ddr card
SBlive platinum sound

 

[pqt]

Hey, your problem sounds exactly like mine, although I use an ASUS A7V133 with Promise RAID controller, 2 IBM ATA100 drives. First time I ran Sandra, I got a ~39000 score. When I rechecked today, I got only ~27000 !! If Windows Disk Cache is disabled, it drops to ~15000! :-(
Could that be a BUG in the software ?!