MICRON 32GB DDR4-2666 ECC RDIMM Server Memory

The PowerEdge R740 and R640 are 14th generation Dell servers that use DDR4 registered ECC DIMMs, which is the type of module this is. Systems of this generation are commonly configured with 32GB 2666MT/s RDIMMs. Follow Dell's memory population guidelines for your processor count. Do not mix RDIMMs with LRDIMMs in the same server, as the two buffer types are not supported together.

No. Registered DIMMs, load-reduced DIMMs and unbuffered DIMMs use different buffering schemes, and server platforms do not support mixing them in the same system. If your server already contains RDIMMs, this module is the right type to add. If it uses LRDIMMs, you would need to replace all memory to switch types. Matching capacity and rank across a channel also helps keep performance consistent.

Some second-generation Xeon Scalable (Cascade Lake) processors support memory up to 2933MT/s, but this module is rated at 2666MT/s. In those systems it runs at 2666MT/s. If you mix it with faster modules, the memory channels will normally run at the speed of the slowest installed DIMM. With first-generation Xeon Scalable processors, 2666MT/s is the native maximum memory speed, so the module runs at its full rated speed.

PC4 shows that the module is DDR4. The number 2666 refers to its data rate of 2666 megatransfers per second. The V suffix is the JEDEC timing grade for that speed bin. The same module is sometimes listed as PC4-21300, which refers to its peak bandwidth of about 21,300MB/s. When you match memory in a server, compare speed, module type (RDIMM), capacity and rank.

Generally not. Registered ECC DIMMs need a memory controller and motherboard that support RDIMMs. That means server boards and some workstation boards built for Xeon or similar processors. Consumer desktop motherboards use unbuffered DIMMs and will not accept registered modules, even though the 288-pin slot looks the same. Check your board's documentation for RDIMM support before buying.

It depends on how many DIMM slots your server has. A dual-socket system with 24 slots, such as the Dell PowerEdge R740 or HPE ProLiant DL380 Gen10, reaches 768GB when fully populated with 32GB RDIMMs. A single-processor configuration only uses the slots attached to the installed CPU, so usable capacity is halved. For best bandwidth, fill channels evenly and in the order your vendor recommends.

The module only needs a compatible DDR4 RDIMM slot. No drivers or software are required. The server's BIOS detects the memory at boot, and ECC is handled automatically by the memory controller. Some vendor management tools may report memory from a third-party source differently from factory-branded parts. After installation, it is good practice to confirm that the full capacity shows up in the BIOS or management interface.

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