AMD DUAL OPTERON RECOMMENDED CONFIGURATION CHART
MB Brand Model MB SKU CPU   (Socket 940) CPU SKU CASE PS (if not in case) Memory
MSI K8D Master-F 21283 OPT 240 (1.4GHz) 21323 Any Full Tower Server Case with SSI EPS 12V 450W or higher power supply (example SKU 15430) SSI EPS 12V 450W or higher (example SKU 16023) ECC Registered DDR 266/333 - Up to 12Gb in 6 DIMMS
OPT 242 (1.6Ghz) 21325
OPT 244 (1.8GHz) 21953
OPT 246 (2.0GHz) 23100
MSI K8D Master-FT
(Rack Version)		 21285 OPT 240 (1.4GHz) 21323 1U or larger Recommended Rackmount SSI EPS 12V 450W or higher (example SKU 16023) ECC Registered DDR 266/333 - Up to 12Gb in 6 DIMMS
OPT 242 (1.6Ghz) 21325
OPT 244 (1.8Ghz) 21953
OPT 246 (2.0GHz) 23100
TYAN S2885ANRF Thunder K8W 23379 OPT 240 (1.4GHz) 21323 Any Full Tower Server Case with SSI EPS 12V 450W or higher power supply (example SKU 15430) or Recommended Rackmount SSI EPS 12V 450W or higher (example SKU 16023) ECC Registered DDR 266/333 - Up to 16Gb in 8 DIMMS
OPT 242 (1.6Ghz) 21325
OPT 244 (1.8Ghz) 21953
OPT 246 (2.0GHz) 23100
TYAN  S2880GNR Thunder K8 21061 OPT 240 (1.4GHz) 21323 Any Full Tower Server Case with SSI EPS 12V 450W or higher power supply (example SKU 15430) or Recommended Rackmount SSI EPS 12V 450W or higher (example SKU 16023) ECC Registered DDR 266/333 - Up to 12Gb in 6 DIMMS
OPT 242 (1.6Ghz) 21325
OPT 244 (1.8Ghz) 21953
OPT 246 (2.0GHz) 23100
TYAN S2880UGNR Thunder K8 21064 OPT 240 (1.4GHz) 21323 Any Full Tower Server Case with SSI EPS 12V 450W or higher power supply (example SKU 15430) or Recommended Rackmount SSI EPS 12V 450W or higher (example SKU 16023) ECC Registered DDR 266/333 - Up to 12Gb in 6 DIMMS
OPT 242 (1.6Ghz) 21325
OPT 244 (1.8Ghz) 21953
OPT 246 (2.0GHz) 23100
If you want to run a SINGLE OPTERON processor you can use the Asus SK8N (SKU #22635) or TYAN S2850G2N (SKU #22880) and CPU SKU # 23128 (OPT 140 - 1.4GHz) SKU # 23129 (OPT 142 - 1.6GHz) or SKU #23130 (OPT 144 - 1.8GHz)

Note: SSI EPS 12V  power supplies have 24-pin ATX connectors and 8-pin 12V connector

Note 2: Full tower cases that will also work include SuperMicro SC742 or 942 Series with 450W or higher power supply

Note 3: To use 1U Rackmount must have low profile heatsink and memory modules

AMD Processor Technical Information:

AMD Opteron Info and Products

http://www.amd.com/us-en/Processors/DevelopWithAMD/0,,30_2252_739_9003,00.html