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- Description
- Specifications
IBM feature #EM50 is the 16 GB DDR3 memory feature for the IBM Power System S822LC, machine type 8335, models 8335-GCA and 8335-GTA. Each feature code equates to one memory riser card that carries four 4 GB, 1333 MHz DDR3 DRAMs. The riser card also holds a memory scheduler, memory management logic for RAS decisions and energy management, and a buffer cache. That buffer is an L4 cache built on eDRAM, with 16 MB on each riser card.
The Power S822LC is a two-socket POWER8 server with eight memory riser cards, for up to 32 DDR3 RDIMMs. Memory is available as 16 GB (#EM50), 32 GB (#EM51), 64 GB (#EM52) and 128 GB (#EM53) riser cards, and a maximum of 1024 GB is reached with eight #EM53.
On the Power S822LC model 8335-GCA at least two memory features are required, and valid quantities are two, four and eight. Memory features cannot be mixed, and the base memory is 32 GB, two #EM50 riser cards. Later memory upgrades must match the capacity of the initial memory, and eight #EM50 total 128 GB.
On the Power S822LC model 8335-GTA all the memory modules are populated, so the base memory is 128 GB with eight #EM50 riser cards, and memory upgrades are not supported.
| Feature code | #EM50 |
| Description | 16 GB DDR3 Memory |
| Machine types | 8335 (Power S822LC, models 8335-GCA and 8335-GTA) |
| Capacity | 16 GB per feature |
| Construction | riser card with four 4 GB DDR3 DRAMs |
| Speed | 1333 MHz |
| L4 cache | 16 MB per riser card |
| Valid quantities | 2, 4 or 8 (8335-GCA); 8 (8335-GTA) |
| Base memory | 32 GB, two #EM50 (8335-GCA); 128 GB, eight #EM50 (8335-GTA) |
| Mixing of memory features | not supported |