HPE ProLiant DL585 G7 Memory
Genuine HPE DDR3 memory for the HPE ProLiant DL585 G7, new and refurbished. This server carries 48 DIMM slots — twelve per processor, across four channels each — but they are wired to the sockets above them: a DIMM bank is dead unless its processor is installed, so how much memory this machine can hold is decided by how many Opterons are in it.
DL585 G7 Memory Specifications
- Type: DDR3 Registered (RDIMM), PC3-10600 (DDR3-1333) and PC3-8500 (DDR3-1066), including PC3L low power parts
- Slots: 48 in total, twelve per processor across four channels of three sockets; a two-processor server has 24 live slots
- Maximum: 1.5TB, reached only with 32GB modules filling every socket on all four processors
- Kits stocked here: 2GB dual rank x8, 4GB single rank x4, 8GB dual rank x4 in standard and PC3L low power, and 16GB quad rank x4 PC3-8500
- Quad-rank restriction: quad rank modules may be installed only in memory sockets 2, 5, 8 and 11 of each processor
- Protection: Advanced ECC as the standard mode, correcting multi-bit errors where the failed bits share a DRAM device, with Online Spare available through RBSU
The 16GB kit is a quad rank module, and quad rank has rules. Quad rank DIMMs may be installed only in memory sockets 2, 5, 8 and 11 of each processor, and putting one in a channel alongside another module drops that channel to 800MHz. Where clock matters more than density, 8GB dual rank parts hold 1333MHz that quad rank cannot.
What Speed Will Your DIMMs Actually Run At?
| DIMMs per channel | Module type | Standard voltage | PC3L low voltage |
|---|---|---|---|
| 1 | single or dual rank, 1333MHz native | 1333MHz | 1066MHz |
| 1 | quad rank, 1066MHz native | 1066MHz | 1066MHz |
| 2 | single or dual rank, 1333MHz native | 1333MHz | 1066MHz |
| 2 | one quad rank plus one single or dual rank | 800MHz | 800MHz |
| 3 | three dual rank, 1333MHz native | 1066MHz | 800MHz |
The 16GB quad rank kit is the densest module stocked for this server, and density is what it costs you: a quad rank DIMM is a 1066MHz part to begin with, and putting one in a channel alongside anything else drops that channel to 800MHz. Where the workload cares about latency more than footprint, four 8GB dual rank modules per processor hold 1333MHz where four 16GB quad rank modules will not.
Choosing the Right DL585 G7 Memory
- Buy in like-pairs. HPE requires memory to be installed two modules at a time, of the same size — a single odd DIMM has nowhere valid to go.
- Count your processors before you count your slots. Memory bought for an empty socket's bank does nothing; on a two-processor machine, 24 of the 48 slots are simply not there.
- Keep quad rank modules to sockets 2, 5, 8 and 11. The other eight sockets per processor take single and dual rank only, so a tray of 16GB quad rank kits will not populate a bank evenly.
- Watch where you mix x4 and x8 modules. Advanced ECC drops to standard ECC if the two are mixed within channels A and B, or within channels C and D. Mixed across A and C, or B and D, it survives.
- Spread capacity evenly over the processors. HPE documents best performance when every processor carries the same amount of memory, at the same speed and the same voltage.
Complete Your DL585 G7 Build
Slot count follows socket count on this platform, so read the DL585 G7 processors page alongside this one. For the rest of the server, browse DL585 G7 hard drives, storage controllers, networking adapters and power supplies, or start from the full DL585 G7 parts listing. Background reading: understanding memory rank in HPE servers and what CAS latency means. Other platforms are indexed under HPE parts by server model.
DL585 G7 Memory FAQ
What is the maximum memory in a DL585 G7?
1.5TB, which HPE documents as 32GB modules loaded across all four processors' memory banks. The 48 slots that figure depends on only exist when all four processor sockets are populated.
How many memory slots does a DL585 G7 have?
Forty-eight on a four-processor server: twelve per processor, arranged as four channels of three sockets. A two-processor server has 24 usable slots, because DIMM banks are active only when the matching processor socket is populated.
Can I put 16GB memory anywhere in a DL585 G7?
Not quite. The 16GB kit listed for this server is a quad rank module, and quad rank modules are restricted to memory sockets 2, 5, 8 and 11 of each processor. Single and dual rank modules can use any socket in the population order.
Does DL585 G7 memory have to be installed in pairs?
Yes. HPE states that memory must be installed in like-pairs - two modules of the same size. Installing two at a time per processor also performs better than installing one.
Why did my DL585 G7 memory drop to 800MHz?
Most often because a quad rank module shares a channel with another DIMM, which takes that channel to 800MHz. Three dual rank modules in one channel run at 1066MHz on standard voltage parts and 800MHz on PC3L low voltage parts.
Will mixing x4 and x8 modules break Advanced ECC?
It can. Advanced ECC is unavailable if x4 and x8 modules are mixed within channels A and B, or within channels C and D, though standard ECC still works. Mixing them across channels A and C, or B and D, keeps Advanced ECC.
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