HPE ProLiant BL620c G7 Memory
Genuine HPE registered DDR3 memory for the HPE ProLiant BL620c G7, new and refurbished. This is a buffered, scale-up blade: 32 RDIMM slots, sixteen for each installed processor, reached through Intel 7510 Scalable Memory Buffers — and the clock is set by the processor, not by how many slots you fill.
BL620c G7 Memory Specifications
- Type: DDR3-1333 and DDR3-1066 Registered DIMMs, operating at up to 1066MHz; registered modules are the only memory the QuickSpecs lists for this blade
- Slots: 32 in total — each processor carries two memory controllers, each controller feeds two Intel 7510 Scalable Memory Buffers, and each buffer carries four RDIMMs
- Standard: 32GB as four 8GB dual-rank RDIMMs, all on processor 1
- Maximum: 1.0TB with thirty-two 32GB RDIMMs, or 832GB if the four factory 8GB modules stay in place
- Speed rule: memory runs at the processor's QPI rate — 6.40GT/s gives 1066MHz, 5.86GT/s gives 978MHz and 4.80GT/s gives 800MHz — and is not affected by the number of RDIMMs or their rank
- Protection modes: Advanced ECC with SDDC, Double Device Data Correction, demand scrubbing, memory mirroring and rank sparing, with mirroring and sparing unable to run at the same time
The sixteen slots behind an empty socket cannot be used. A one-processor BL620c G7 works with sixteen RDIMMs and stops at 512GB; the second processor is what opens the rest of the 32 slots. Reaching the full 1.0TB also means pulling the four 8GB modules the blade shipped with — keep them and the ceiling is 832GB.
How much memory can one BL620c G7 hold?
| Configuration | RDIMMs fitted | Total |
|---|---|---|
| Standard | four 8GB dual-rank | 32GB |
| One processor, its sixteen slots filled | sixteen 32GB | 512GB |
| Standard memory kept, option kits added | the factory 8GB modules plus option kits | 832GB |
| Standard memory removed, all slots filled | thirty-two 32GB | 1.0TB |
The gap between 832GB and 1.0TB is the four 8GB modules the blade left the factory with: reaching the ceiling means pulling them, not adding to them. Everything above 512GB also assumes a second processor, because the sixteen slots behind an empty socket cannot be populated at all.
Choosing the Right BL620c G7 Memory
- Buy in pairs. RDIMMs are installed in pairs with identical characteristics, and HPE recommends identical part numbers throughout the blade for configuration simplicity. Every option kit here is a single RDIMM, so a pair is two kits.
- Spread capacity across both sockets. In a two-processor blade, HPE asks that the total be distributed between the processors as evenly as possible; the minimum working configuration is two RDIMMs on processor 1.
- Larger modules will not buy you clock. Speed follows the processor's QPI rating, so a blade capped at 978MHz or 800MHz stays there whatever the module rating on the label.
- Mixed ranks go in a set order. When ranks differ within a socket, the modules with the highest rank count belong in the white connectors, so the heavier electrical load sits at the end of the channel.
- Mixing 1.5V and 1.35V costs the saving. Standard DDR3 and low-voltage DDR3L RDIMMs may share a socket, but every module on that socket then runs at 1.5V.
Complete Your BL620c G7 Build
The processor sets both the memory clock and how many slots are usable — see BL620c G7 processors before sizing an upgrade. Also available: BL620c G7 hard drives and storage controllers, or the full BL620c G7 parts listing, with every model we stock under HPE parts by server model. Background reading: understanding memory rank in HPE servers and the importance of memory speed.
BL620c G7 Memory FAQ
What is the maximum memory in a BL620c G7?
1.0TB, using thirty-two 32GB registered DIMMs with two processors installed. Leaving the four factory 8GB modules in place caps the blade at 832GB.
How many memory slots does a BL620c G7 have?
Thirty-two, sixteen for each installed processor. The slots behind an empty socket cannot be used, so a single-processor blade works with sixteen and tops out at 512GB.
Does filling every slot slow this blade's memory down?
No. Memory speed here follows the processor's QPI rate rather than the number of modules or their rank: 6.40GT/s runs memory at 1066MHz, 5.86GT/s at 978MHz and 4.80GT/s at 800MHz.
Can I use unbuffered memory in a BL620c G7?
The QuickSpecs list registered DDR3 only. DDR3-1333 and DDR3-1066 RDIMMs are the documented memory for this blade, and they operate at up to 1066MHz.
Do BL620c G7 memory kits contain more than one DIMM?
No. Every DDR3 option kit for this blade is a single RDIMM, and RDIMMs must be installed in pairs with identical characteristics, so an upgrade is always an even number of kits.
Can I mix 1.5V and 1.35V modules in one blade?
Yes, within the same socket, but all RDIMMs on that socket then run at 1.5V. You keep the capacity and lose the low-voltage saving.
✅ Looking for a specific BL620c G7 memory module? Browse our full selection below.
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