Is it possible to use Xeon E5450 with 8GB (preferably 16GB) DIMMs of DDR3 Registered Buffered ECC RAM?
I checked Intel's Spec page for Xeon E5450
None explicitly mention ECC (specifically DDR3 ECC) with regard to Harpertown Xeon. However the information paragraph does mention that the Seaburg chipset supports up to 128GB of RAM. Which would necessitate 64 2GB DDR2 DIMMs, and I can't imagine any motherboard with 64 DIMM slots on it, so I can only imagine that would be DDR3....
When I look at the Wikipedia page of Xeon Chipsets (oddly the page doesn't contain the string "DDR3" or "DDR4" anywhere on the whole page). It does mention that Seaburg chipset is FB (which I assume means Fully Buffered?) DDR2. Intel's 5400 Memory controller chipset specsheet confirms that Seaburg is DDR2.
You might be thinking "CASE CLOSED, E5450 clearly doesn't support DDR3"... But that does not explain how I have successfully tested these CPU's with DDR3 RAM
I have run Xeon E5450 CPUs successfully with:
Various Desktop DDR2 motherboards (With 775 socket modified to accept 771)
(Accepts 2x DDR2 DIMMS, max 4GB RAM combined, lame)
An Intel Desktop DDR3 motherboard (With 775 socket modified to accept 771)
(Accepts 2x DDR3 DIMMs limited to 4GB per DIMM by BIOS, max 8GB combined, lame)
Why do I care?
The performance of these CPUs is obviously weak. However I have 5x Xeon E5450 CPUs and if I can get suitable DDR3 ECC motherboards for them cheaply, I can probably put them to good use in workloads that are not CPU intensive. For example: fileserver (need lots of RAM for cache), webserver, mailserver, DNS server, etc.
The reason the idea interests me is to minimize the cost of building my first redundant cluster of servers.
If I can't run a decent amount of DDR3 ECC RAM with these CPU's I'll just recycle them.