I just got done banging my head against my desk with this damned Poweredge 600sc after installing a 512meg stick of Crucial ECC registered ram. It kept coming up with a message saying "Your system is limited to 256MB of memory!" and I tried everything to fix it. I finally called Crucial and they couldn't figure it out either, so they were RMAing the stick.
Well as I was on the phone I looked in the manual (what a concept!) and figured out that if you have the "OS install mode" enabled in the BIOS, it only gives you 256megs of memory. To access the rest of your memory, just disable that feature.
I went ahead and called Crucial Support back with this info and they said they'd add it to their knowledge base. The guy I talked to says that they've been getting lots of these lately and no one ever told them how they fixed it.
Anyway, just a tip for you 600sc owners.
Jugs
Well as I was on the phone I looked in the manual (what a concept!) and figured out that if you have the "OS install mode" enabled in the BIOS, it only gives you 256megs of memory. To access the rest of your memory, just disable that feature.
I went ahead and called Crucial Support back with this info and they said they'd add it to their knowledge base. The guy I talked to says that they've been getting lots of these lately and no one ever told them how they fixed it.
Anyway, just a tip for you 600sc owners.
Jugs