HPE ProLiant BL460c Gen9 Memory
Genuine HPE SmartMemory DDR4 for the HPE ProLiant BL460c Gen9, new and refurbished. The blade carries 16 DIMM slots — eight per processor, four channels at two DIMMs per channel — and the first thing to settle is Registered against Load Reduced, because HPE treats them as distinct technologies that cannot be mixed in one blade.
BL460c Gen9 Memory Specifications
- Type: HPE SmartMemory DDR4 Registered (RDIMM) or Load Reduced (LRDIMM) at 1.2V; DDR3 from earlier generations is not compatible with this blade
- Slots: 16 in total, eight per processor across four channels at two DIMMs per channel; with only one processor installed, half the slots are unavailable
- Maximum registered: 512GB, using sixteen 32GB dual-rank RDIMMs, documented at up to 2133MT/s
- Maximum load reduced: 2TB, using sixteen 128GB octal-rank LRDIMMs at up to 2400MT/s; 64GB quad-rank modules reach 1TB
- Speed: DDR4-2400 kits are listed against E5-2600 v4 processors and DDR4-2133 kits against v3; the populated bank runs at 2400, 2133, 1866 or 1600MT/s depending on configuration and processor model
- Protection: Advanced ECC with single device data correction, memory mirroring, online spare (rank spare) mode, failed DIMM isolation, and address parity protection on both RDIMMs and LRDIMMs
Registered and Load Reduced cannot be mixed, and the gap between them is large. RDIMMs reach 512GB in this blade; LRDIMMs reach 2TB with 128GB octal-rank modules. Converting from one technology to the other means replacing all sixteen DIMMs, so check what is fitted before ordering a single kit — and note that 128GB modules cannot be mixed with any other capacity.
Registered or Load Reduced for a BL460c Gen9?
| Registered (RDIMM) | Load Reduced (LRDIMM) | |
|---|---|---|
| Documented maximum | 512GB (16 × 32GB) | 2TB (16 × 128GB) |
| Kit sizes stocked | 8GB, 16GB, 32GB | 32GB, 64GB, 128GB |
| Speed at 2 DIMMs per channel | 2133MT/s | 2400MT/s |
| Mixing with the other type | Not supported | Not supported |
Registered is the sensible route to a working set of 128GB or 256GB and the cheaper module per gigabyte. Load reduced is the only way past 512GB, and it is also the only way to hold 2400MT/s once both slots in a channel are filled. The 128GB octal-rank module is a special case worth knowing about before you order one: HPE states it cannot be mixed with any other DIMM capacity in the blade, so it is an all-or-nothing fill.
Choosing the Right BL460c Gen9 Memory
- Check which technology is fitted before ordering. RDIMM and LRDIMM cannot be mixed, so converting a blade from one to the other means replacing all sixteen modules, not adding to them.
- Buy the kit that matches the processor family. The DDR4-2133 kits here are listed against E5-2600 v3 processors and the DDR4-2400 kits against v4; the blade settles on one common speed for the whole bank, so a faster module in a slower machine simply runs slower.
- Expect the step down on registered memory. RDIMMs hold 2400MT/s at one DIMM per channel and drop to 2133MT/s at two, where 32GB and 64GB load reduced modules hold 2400MT/s at both populations.
- Some processors close four slots. With an E5-2699 v3, E5-2697 v3, E5-2667 v3, E5-2643 v3 or E5-2637 v3 fitted, DIMM slots 4 and 5 are not accessible, leaving twelve usable slots in a two-processor blade.
- Every kit here is a single DIMM. Filling all sixteen slots with 16GB modules is sixteen kits, not one boxed set.
Complete Your BL460c Gen9 Build
The processor sets the memory clock and a second one opens the other eight slots — see BL460c Gen9 processors before deciding on capacity. For the rest of the blade, browse BL460c Gen9 drives, storage controllers and networking adapters, or the full BL460c Gen9 parts listing. Adjacent generations: BL460c Gen8 memory and BL460c Gen10 memory. Background reading: understanding memory rank in HPE servers, the importance of memory speed and the HPE parts by server model index.
BL460c Gen9 Memory FAQ
What is the maximum memory in a BL460c Gen9?
2TB, using sixteen 128GB octal-rank Load Reduced DIMMs. Registered DIMMs reach 512GB with sixteen 32GB modules. A single-processor blade reaches half of either figure, because only eight of the sixteen slots are available.
Can I mix RDIMM and LRDIMM in a BL460c Gen9?
No. HPE states that Registered and Load Reduced are distinct memory technologies and cannot be mixed within a server. Whichever is fitted today is what an upgrade has to match.
Will DDR3 memory from a BL460c Gen8 work in a Gen9?
No. The Gen9 blade is DDR4 and HPE states that memory from previous generation servers is not compatible with it. There is no adapter or firmware route around it.
How many memory slots does the BL460c Gen9 have?
Sixteen, arranged as eight per processor across four channels with two DIMMs per channel. Only eight are usable with a single processor installed.
Why does my BL460c Gen9 memory run at 2133 instead of 2400?
Usually because both slots in each channel are filled. Registered DIMMs run at 2400MT/s with one DIMM per channel and 2133MT/s with two. The processor model and the slowest module fitted also cap the speed, since the blade picks one common speed for the whole bank.
Do I lose DIMM slots with certain processors?
Yes. With the E5-2699 v3, E5-2697 v3, E5-2667 v3, E5-2643 v3 or E5-2637 v3 installed, DIMM slots 4 and 5 are not accessible, which leaves twelve usable slots in a two-processor blade.
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