Lenovo 01KN325 16GB TruDDR4 2400 MHz 2Rx8 ECC UDIMM

01KN325 is Lenovo's 16GB TruDDR4 unbuffered memory module with ECC, rated at 2400 MHz, dual-rank x8 (2Rx8) and 1.2V. In the Lenovo Press product guide for the System x3250 M6 it carries feature code AVKN, with up to four supported per server.

Four of these modules give the x3250 M6 its stated maximum of 64GB; two of them reach the 32GB limit for one DIMM per channel. The server has two memory channels with two DIMM slots each.

Although rated at 2400 MHz, Lenovo groups this DIMM under UDIMMs that operate at up to 2133 MHz in the x3250 M6, and the processor must also support 2133 MHz. Celeron G3900-series processors in the guide are listed at 1866 MHz memory.

Lenovo notes that TruDDR4 memory carries a signature programmed into the DIMM, which lets System x servers check that installed memory is qualified.

The 8GB module of the same type is 01KN321 (AVKM). The guide's 16GB 2133 MHz UDIMM is 46W0817 (ATRZ). Half the capacity at the same speed is 01KN321, and the 2133 MHz 16GB UDIMM is 46W0817; more System x memory is on our IBM System x memory hub.

Fit check: confirm a System x3250 M6 and plan for up to four UDIMMs in total, since the server has only four slots.