Unfortunately, this controller is very particular about its memory.  It has to be 256mb, and it prefers the Dell part. We have tried to send out larger DIMM's to replace the smaller ones and each time it fails.   You will be better off spending the money on the actual part on this.  Regards,
I know the 256MB PC2-3200R DIMM for the PERC RAID controller is just about impossible to come by. I have a bunch of PE2850 servers that we are replacing/virtualizing. I have had at least 7 servers experience the dreaded "memory/battery" problem. I found a new 512 MB Samsung DIMM that seems to have all of the same specs except for the size. I can I use this DIMM as a replacement?
Old PE2850, can I replace the 256MB RAID cache memory module with a 512 MB 
module?