Intel Pentium 1405 V2 socket: LGA 1356

What the Pentium 1405 V2 is

The Pentium 1405 V2 is a low power Ivy Bridge-EN dual core for single socket micro servers on LGA 1356. Intel set two cores and two threads at a fixed 1.4 GHz with 6 MB of cache. Power is 40 W on 22 nm from January 2014. No turbo and no Hyper-Threading keep behavior simple for cold storage and edge nodes.

Low fixed clocks trim power for dense racks that run many nodes. Two threads suit file serving, DNS and light containers with ECC memory. Large 6 MB cache for a dual core trims memory trips in small working sets. An SSD shapes response more than clocks in these roles. Buyers pick the 1405 V2 where core count matters less than watts per node.

No integrated graphics exist on this server part, so boards use BMC graphics for management. DDR3 with ECC over three channels feeds the socket. The mix is a server socket for operators who want the lowest power LGA 1356 entry with server memory protection.

Socket and motherboard compatibility

The 1405 V2 fits LGA 1356 on C600 series boards such as C602 for single socket use. Firmware must list the v2 stepping, since early Romley-EN boards shipped for Sandy Bridge-EN. Check the vendor CPU table for the minimum BIOS. Desktop sockets never accept this server part.

Memory is DDR3 ECC RDIMMs over three channels. The Socket vs chipset: what decides whether a CPU works guide is desktop focused, so follow server board manuals for populations. Cooler mounting is board specific with vendor heatsinks for 40 W, not a retail pattern.

A move to Xeon on the same socket adds cores where vendor firmware allows. Check power and memory limits before swapping a 40 W Pentium for a 95 W Xeon.

Memory, PCIe and cooling

DDR3-1333 over three channels with ECC suits micro servers. Even populations across channels protect bandwidth. Registered DIMMs allow larger counts on Xeon boards that also take this Pentium. Board manuals set speed by DIMM count.

PCIe is 24 lanes of PCIe 3.0 per socket in x4, x8 and x16 splits for networking and HBAs. One QPI link ties two sockets on dual boards, though this Pentium targets single socket use. Lane layout follows the server manual.

Cooling follows vendor qualified 40 W heatsinks with front to back rack airflow. No retail cooler exists. Inlet temperature decides sustained clocks more than headline frequency at this power.

Upgrade paths

On the same socket the Intel Pentium 1403 V2 at 2.6 GHz with 6 MB of cache is a higher clock twin for single threaded server tasks. The Intel Xeon E5-1428L v2 with six cores and 12 threads is the thread step for virtual hosts on similar boards. Both share DDR3 ECC and LGA 1356 mounting.

A larger platform means a bigger socket such as LGA 2011-v3. The 1405 V2 covers low power LGA 1356 nodes where 1.4 GHz dual cores are enough.