Lenovo 01KN321 8GB TruDDR4 2400 MHz 1Rx8 ECC UDIMM

01KN321 is a Lenovo 8GB TruDDR4 memory module: a 2400 MHz, single-rank x8 (1Rx8), 1.2V ECC unbuffered DIMM. Lenovo Press lists it in the System x3250 M6 product guide with feature code AVKM and a maximum of four per server.

The x3250 M6 guide groups the 2400 MHz UDIMMs under a heading that says they operate at up to 2133 MHz. The server's maximum memory speed is 2133 MHz at one or two DIMMs per channel, and the processor must support that speed. Lenovo's processor table lists 1866 MHz memory for the Celeron G3900 models.

The x3250 M6 has four DIMM slots on two memory channels and accepts configurations of one, two, three or four UDIMMs. With 8GB modules in all four slots the server holds 32GB; the guide's maximum is 64GB with 16GB modules.

The 16GB version of the same 2400 MHz TruDDR4 UDIMM is 01KN325 (AVKN). The guide also lists 2133 MHz UDIMMs: 46W0809 (4GB), 46W0813 (8GB) and 46W0817 (16GB). For 16GB in the same 2400 MHz class, pick 01KN325; the 2133 MHz 8GB UDIMM is 46W0813, and the IBM System x memory hub lists more modules.

Fit check: confirm the server is a System x3250 M6, since this guide is the Lenovo source that lists 01KN321, and that only ECC UDIMMs, not RDIMMs, are being installed.