HPE ProLiant SL390s G7 Memory

Genuine HPE DDR3 memory for the HPE ProLiant SL390s G7, new and refurbished. Each server tray carries 12 DIMM slots across three channels per processor, and the single decision that shapes every upgrade is Registered against Unbuffered, because the two cannot run together in one tray.

SL390s G7 Memory Specifications

• Type: DDR3 Registered (RDIMM) or Unbuffered with ECC (UDIMM), in PC3-10600 (DDR3-1333) and PC3-8500 (DDR3-1066), including PC3L low-voltage parts
• Slots: 12 per server tray, three memory channels per processor socket; HPE documents a maximum of six Registered DIMMs per processor
• Maximum registered: 192GB per tray, on twelve 16GB quad-rank PC3-8500 modules
• Maximum unbuffered: 48GB per tray, on twelve 4GB modules
• Rank limit: a maximum of eight ranks per memory channel, which means no more than two quad-rank DIMMs on any one channel
• Low voltage: PC3L kits are supported only with Intel Xeon 5600 series processors
• Protection: Advanced ECC multi-bit error protection and Lock-step mode, with memory running at 1333MHz, 1066MHz or 800MHz depending on the modules fitted and the processor

The 192GB ceiling and the 1333MHz clock are not available at the same time. Registered DIMMs reach 192GB per tray and Unbuffered stop at 48GB, but the 16GB kit that gets you to 192GB is a quad-rank PC3-8500 part — DDR3-1066, not DDR3-1333. Two quad-rank modules per channel is also the documented limit, and twelve of them sits exactly on it.

Should You Fit Registered or Unbuffered DIMMs?

For any SL390s G7 bought for capacity, Registered is the only answer — Unbuffered tops out at a quarter of the registered ceiling. The catch is that the ceiling costs clock: the 16GB kit that reaches 192GB is a quad-rank PC3-8500 part, so a fully loaded tray runs its memory at DDR3-1066 rather than the DDR3-1333 the smaller kits carry.

Choosing the Right SL390s G7 Memory

• Check which type is already fitted before ordering. Registered and Unbuffered cannot be mixed, so converting a tray from one to the other means replacing every module in it.
• Quad-rank modules are limited to two per channel. Eight ranks per channel is the documented ceiling, and twelve 16GB quad-rank DIMMs across two processors is exactly that limit, not a margin below it.
• Low-voltage PC3L kits need Xeon 5600 series processors. On anything else, fit standard-voltage PC3 parts.
• Populate in threes per processor. With three channels per socket, kits bought in threes keep the memory controller balanced.
• Every HPE DDR3 option kit here is a single DIMM. A 96GB upgrade is twelve 8GB kits, not one boxed set.

Complete Your SL390s G7 Build

The registered ceiling assumes both sockets are filled, so check the SL390s G7 processors before sizing an upgrade. For the rest of the tray, browse SL390s G7 hard drives, storage controllers and networking adapters, or the chassis-level power supplies, and start from the full SL390s G7 parts listing or HPE parts by server model. Background reading: understanding memory rank in HPE servers and the importance of memory speed.

SL390s G7 Memory FAQ

What is the maximum memory in an SL390s G7?
192GB per server tray using Registered DIMMs, reached with twelve 16GB quad-rank PC3-8500 modules. Unbuffered configurations stop at 48GB, on twelve 4GB modules.

How many memory slots does an SL390s G7 tray have?
Twelve, across three memory channels per processor socket. HPE documents a maximum of six Registered DIMMs per processor, so the 192GB ceiling assumes both sockets are filled.

Can I mix Registered and Unbuffered memory in an SL390s G7?
No. The two types cannot run together in one tray. Whichever is fitted today is what an upgrade has to match.

How many quad-rank DIMMs can I put on one channel?
Two. HPE documents a maximum of eight ranks per memory channel, and a quad-rank module uses four of them. A full twelve-slot fill of 16GB quad-rank kits sits exactly on that limit.

Why does a fully loaded SL390s G7 run its memory at 1066MHz?
Because the 16GB kit that reaches the 192GB ceiling is a PC3-8500 part, which is DDR3-1066 by specification. Depending on the modules and processor fitted, this platform runs memory at 1333MHz, 1066MHz or 800MHz.

Can I use PC3L low-voltage memory in an SL390s G7?
Only with Intel Xeon 5600 series processors. Low-voltage DIMMs are documented for that family alone on this platform.

✅ Looking for a specific SL390s G7 memory module? Browse our full selection below.

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