Only memory operates at 1333MHz on the IBM x3650 m4 platform
Only memory operates at 1333MHz on the IBM x3650 m4 platform
I own an older IBM x3650 m4 featuring two E5-2630v2 processors and 24x 16GB dual-rank DDR4 modules. Until now, I've run the full 384GB at 1333MHz. Now I'm curious about using 256GB or 128GB for quicker performance. As expected, I should achieve around 1866MHz with one module and 1600MHz with two modules. However, I'm only getting 1333MHz. I've set all power levels to maximum, disabled mirroring and rank sparing, and used only the white slots. I've attached photos of my current 128GB setup. For more details, refer to page 50 (62) onward: https://systemx.lenovofiles.com/help/top...15_isg.pdf. Anyone familiar with IBM Systems? Are you making a mistake or am I misunderstanding something? Feel free to share more info if needed. Thanks in advance, and let me know if you want to proceed.
Intel Xeon Processor E5-2600 series officially backs up to 1600 MHz. The BIOS might adhere to these limits or cap performance at 1333 MHz depending on RAM stick count. Refer to pages 63 and 64 in the provided documentation for details. The recommended settings are: install one RDIMM per channel for 1866 MHz, two RDIMMs for 1600 MHz, and three RDIMMs for 1066 MHz. All server channels operate at the same highest frequency. The top speed depends on the CPU, DIMM type, operating modes, and installed memory count. Important points: - With dual-rank per channel, the system reaches 1600 MHz if matching conditions are met. - The server allows up to 16 dual-rank UDIMMs, two per channel, and supports up to 24 single-rank or 16 quad-rank RDIMMs. - Three quad-rank units aren't permitted in the same channel.
Thanks for your time. I managed to figure it out. The previous owner had the same memory but with varying speeds, probably upgrading over time. I removed all the sticks: 1866MHz and two 1600MHz units. The ones I kept in the slots with all 10600 (1333MHz) chips. Everything was dual-rank x4, labels stayed consistent, only the speeds changed. 1333MHz felt unusual—maybe it wasn’t listed in the docs. After sorting, it works smoothly at 8x 1866MHz now.