Dell PowerEdge M520 Technical Guide - Page 19

Memory speed The M520 server supports memory speeds of 1600MT/s, 1333MT/s, 1066MT/s and 800MT/s, depending on the DIMM types installed and the configuration. All memory on all processors and channels run at the same speed and voltage. By default, the system runs at the highest speed for the channel with the lowest DIMM voltage and speed. The operating speed of the memory is also determined by the maximum speed supported by the processor, the speed settings in the BIOS, and the operating voltage of the system. Table 8 lists the memory configuration and performance details for the M520, based on the population of the number and type of DIMMs per memory channel. Table 8. Memory speed capabilities DIMM type DIMM 0 DIMM 1 DIMM 2 # of DIMMs 800* Speed (MT/s) 1066* 1333 1600 SR 1 ∞ ∞ ∞ ∞ DR 1 ∞ ∞ ∞ ∞ UDIMM SR SR 2 ∞ ∞ ∞ ∞ SR DR 2 ∞ ∞ ∞ ∞ DR DR 2 ∞ ∞ ∞ ∞ SR 1 ∞ ∞ ∞ ∞ DR 1 ∞ ∞ ∞ ∞ QR 1 ∞ ∞ ∞ SR SR 2 ∞ ∞ ∞ ∞ SR DR 2 ∞ ∞ ∞ ∞ DR DR 2 ∞ ∞ ∞ ∞ RDIMM QR SR 2 ∞ ∞ QR DR 2 ∞ ∞ QR QR 2 ∞ ∞ SR SR SR 3 ∞ ∞ ∞ SR SR DR 3 ∞ ∞ ∞ SR DR DR 3 ∞ ∞ ∞ DR DR DR 3 ∞ ∞ ∞ *Although the M520 supports DIMM speeds of 800MT/s and 1066MT/s, you can only purchase this system with DIMM speeds of 1333MT/s and 1600MT/s on Dell.com/PowerEdge. Memory RAS features RAS features help keep the system online and operational without significant impact to performance, and can decrease data loss and crashing due to errors. RAS aids in rapid, accurate diagnosis of faults which require service. Table 9 describes the memory RAS features supported on the M520. 19 PowerEdge M520 Technical Guide