Doesn't appear that one will work. The RAID controller DIMM is very specific.    Here is the information on the DIMM you need to find:  256MB DIMM, 200MHz, 32X72, 8K, 240, 1RX16 (PERC 5i)  Part #: 6R829 Dell no longer has this in stock; you will have to find from a third party source, such as this: www.impactcomputers.com/6r829.html Regards,
Hi there! I got a lovely POWEREDGE 2900 coming up with an Single-bit ECC Errors due to the DIMM on the DELL UT571 SAS Controller. Now I have been scouring the internet to find out if I can simply slap another DIMM into it and get it running or if the 256 meg DIMM (DDR2) stick has a certain coding to it that allows the RAID to function. I have already attempted to do so and the system could not find a boot drive. Where can I find a replacement RAID DIMM to activate the RAID controller since using Regular DDR2 RAM will not allow it to properly boot. P.S. This all started because the server sat around too long without being booted. 
DELL POWEREDGE 2900 DELL UT571 SAS Controller DIMM