Intel Xeon L5335 socket: Socket 771

What the Xeon L5335 is

The Intel Xeon L5335 is a 2 GHz low-voltage server quad core from August 2007. It runs four Core cores at 2 GHz with no turbo, so 4 cores give 4 threads. Cache is 8 MB of L2 as two 4 MB dies on a 65 nm process. Power is rated at 50 W on Socket 771.

The L5335 brought Clovertown quads to power capped racks on a 1333 MT/s bus with a 6x multiplier at about 380 dollars launch price. It exists because dense servers wanted quad core throughput at about 12.5 W per core with virtualization extensions.

Socket and motherboard compatibility

The L5335 fits dual-socket Socket 771 server boards with a BIOS that lists low-voltage Clovertown quads. It suits dense chassis qualified for 50 W quads. Check the server maker CPU list for the exact board and stepping. The Socket vs chipset: what decides whether a CPU works guide covers pairing rules.

Memory, PCIe and cooling

Memory is DDR2 FB-DIMMs through the server board chipset.

A 1333 MT/s front side bus ties the CPU to the server chipset. PCIe slots hang off the chipset.

Cooling uses vendor qualified server heatsinks for the 50 W envelope in dense chassis with directed airflow.

Upgrade paths

On Socket 771 the upgrade is the Intel Xeon X5365 at 3 GHz with the same 8 MB cache where the chassis cools 150 W, or Harpertown low-voltage quads such as the 2.5 GHz L5420 at 50 W. Beyond Socket 771 a move to a newer Xeon platform needs new boards and memory.