UDIMM DDR3 memory support on the Intel® Xeon® processor 5500 series
The chart below shows the number UDIMMs per channel supported on the Intel Xeon processor 5500 series based upon the memory speed and ranks per DIMM.
| Platforms with UDIMM-only Routing | |||||||||
| DIMM Slots per Channel | DIMMs Populated per Channel | DIMM Type | Supported Speeds | Ranks per DIMM (Any Combination) | Population Rules | ||||
| 2 | 1 | Unbuffered DDR3 (with or without ECC) Unbuffered DDR3 | 800, 1066, 1333 | SR, DRO |
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| 2 | 2 | Unbuffered DDR3 (with or without ECC) Unbuffered DDR3 | 800, 1066 | Mixing SR, DR | |||||
| Platforms with Combo UDIMM / RDIMM 3 DIMMs per Channel Routing | |||||||||
| DIMM Slots per Channel | DIMMs Populated per Channel | DIMM Type | Supported Speeds | Ranks per DIMM (Any Combination) | Population Rules | ||||
| 3 | 1 | Unbuffered DDR3 (with or without ECC) | 800, 1066, 1333 | SR, DR |
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| 3 | 2 | Unbuffered DDR3 (with or without ECC) | 800, 1066 | Mixing SR, DR | |||||
| Quick UDIMM Population Guide | ||
| DIMM Type | DIMMs per Channel | Top Speed Supported |
| UDIMM with or without ECC | 1DPC | 1333 |
| 2DPC | 1066 | |
| 3DPC | No support | |
| Max Memory Possible | |
| SR UDIMMs | 24GB (12x 2GB DIMMs) |
| DR UDIMMs | 48GB (12x 4GB DIMMs) |
Other notes and restrictions:
- Intel® Xeon® processor 5500 series will support all timings defined by JEDEC.
- 256MB, 512MB, 4GB technologies, x4 DRAM on UDIMM and quad rank UDIMM are NOT supported.
- x16 DRAM is not supported on combo routing.
- All channels in a system will run at the fastest common frequency.
- No mixing of registered and unbuffered DIMMs.
- Mixing ECC and non-ECC UDIMMs anywhere on the platform will force system to run in non-ECC mode.
- No RAS support for non-ECC UDIMMs.
- No x4 SDDC support with UDIMM w/ECC, however, x8 SDDC is supported in lock step mode with x8 UDIMMs w/ECC.
See www.intel.com/content/www/us/en/platform-memory/platform-memory.html for results of testing of a sampling of DDR3 DIMMs with the Intel® Xeon® processor 5500 series based motherboards. The information is to be used as a guide to module compatibility with Intel server reference platforms using the Intel Xeon processor 5500 series.