Ml 115 E200 raid performance

[CEservices]

We have had a ML115 g5 which had 3 drives raid5 on nvidia onboard sata which kept killing the raid we then checked all disks and created a raid1 removing one disk but it still kept killing raid but we did not loose data so am running on single disk. Because of the issues other users have had we got an E200 card and created a raid1 set and set off a restore of our800gb image by the second day when it says 1 day 10 hours left we abandoned . I have tried same card and disks in a test ml150 in the office it restores in 15 hours consistently. We put it back on ml115 and get same slow restore so are still running on single disk on nvidia raid. any help much appreciated thanks