For sale is a pair of **Samsung 16GB DDR4-2666 ECC Registered (RDIMM) memory modules**, for a total of **32GB**.
2 × Samsung M393A2K43BB1-CTD
Capacity: 16GB each / 32GB totalMemory Type: DDR4-2666ECC: YesModule Type: Registered DIMM (RDIMM)Rank: 2Rx8Voltage: 1.2VQuantity: 2 modules
### Condition
Original packaging was opened and they were installed in a computer. However, they have **less than one hour of actual use**.
I originally purchased these while building a computer and mistakenly bought **ECC Registered (RDIMM) memory instead of the type required by my motherboard**. The system would not POST with RDIMM memory installed. Once I discovered that I had purchased the wrong memory type, the modules were removed and stored.
They were **not removed because of a failure or problem with the RAM**. They were simply incompatible with the system for which I purchased them.
The modules have been stored in a protective memory tray since removal.
### IMPORTANT — PLEASE CHECK COMPATIBILITY
These are **ECC Registered (RDIMM)** modules intended for compatible servers and workstations.
**They are NOT standard desktop DDR4 memory and are NOT interchangeable with ordinary DDR4 UDIMMs or ECC UDIMMs.**
Please verify that your motherboard and processor specifically support **DDR4 ECC Registered (RDIMM)** memory before purchasing.
I learned that distinction the expensive way, so I want to make absolutely certain the next owner knows exactly what they are buying. Please refer to the photo for the exact modules and label information.