Socket Geek

Socket 771 socket: CPUs, chipsets and cooler fit

Socket 771 is the Intel land grid array socket that carried server processors from 2006. It holds 771 contacts for flip-chip land grid packages with front side bus speeds of 667 to 1600 MT/s. Intel introduced it as Socket J for dual-socket Woodcrest Xeon servers, succeeding Socket 604, with LGA 1366 as its successor.

Quick facts

MakerIntel
Package typeLGA
Contacts771
Package size37.5 × 37.5 mm
IntroducedMay 2006
StatusLegacy
MemoryDDR2 and DDR3 through the server board chipset
PCIe from the CPUFront side bus to the server chipset; PCIe slots hang off the board chipset
Cooler mounting holesBoard specific (server heatsink)
ReplacesSocket 604
Replaced byLGA 1366

Overview

The socket matters for this batch because the Celeron 445 is a Conroe-CL part, a Core-based single core in the LGA 771 package for single-CPU configurations only. Unlike real Woodcrest Xeons, Conroe-CL chips cannot run in dual-socket boards. The Celeron 445 runs one core at 1.866 GHz with 512 KB of L2 cache on a 1066 MT/s bus at 65 W.

Memory is DDR2 through the server board chipset in two channels. Cooling is entirely server vendor hardware with threaded backplates, so a processor swap stays within the thermal design the chassis was qualified for.

Processor generations

CodenameMarketing nameYearsNotes
Conroe-CLConroe-CL single-CPU parts200865 nm Core parts in the LGA 771 package for single-CPU servers only, including the single-core 1.866 GHz Celeron 445 with 512 KB of L2 cache at 65 W from May 2008.
YorkfieldCore 2 Extreme QX9775200845 nm quads with 2x6 MB of L2 cache for dual-socket Skulltrail, including the unlocked 3.2 GHz QX9775 on a 1600 MT/s bus at 150 W from March 2008.
HarpertownXeon 5400 server quads200845 nm dual-processor server quads with 2x6 MB of L2 cache, from the 2.133 GHz 40 W L5408 to the 3.4 GHz 150 W X5492 from 2008.
ClovertownXeon 5300 server quads2006 to 200765 nm dual-processor server quads with 2x4 MB of L2 cache, including the 3 GHz X5365 at 150 W and the 2 GHz L5335 at 50 W from August 2007.
DempseyXeon 5000 Dempsey200665 nm NetBurst dual-core parts with HT and 2x2 MB of L2 cache, from the 2.5 GHz 95 W 5020 to the 3.73 GHz 130 W 5080 from May 2006.
WoodcrestXeon 5100 Woodcrest200665 nm Core dual-core parts with 4 MB of shared L2 cache, from the 1.6 GHz 65 W 5110 to the 3 GHz 80 W 5160 from June 2006.

Chipsets for Socket 771

Intel 5400 series

Server platform contemporary with Harpertown Xeons and Skulltrail Extreme parts.

ChipsetSegmentNotes
5400WorkstationSeaburg and Skulltrail server chipset for LGA 771 multiprocessor boards.

Who Socket 771 serves

Socket 771 fits single-CPU servers that pair a Conroe-CL processor with a server board qualified for single-CPU LGA 771 operation. The Celeron 445 at 1.866 GHz suits basic server and embedded duty at 65 W where a full Xeon is unnecessary. Every installation needs the server maker CPU list because single-CPU support is board specific.

Memory and cooling

Memory on Socket 771 is DDR2 through the server board chipset in two channels. Expansion hangs off the server chipset because these CPUs provide no PCIe lanes or graphics. Cooling uses the server vendor heatsink for the exact chassis, and a 65 W Conroe-CL part must only replace a chip the thermal design was qualified for.

CPUs on Socket 771

39 processor pages in the database, newest first.

ProcessorCores / threadsBase / boostTDPLaunched
Intel Xeon L54304 / 42.67 GHz50 WSep 2008
Intel Xeon X54704 / 43.33 GHz120 WSep 2008
Intel Xeon X54924 / 43.4 GHz150 WSep 2008
Intel Celeron 4451 / 11.87 GHz65 WMay 2008
Intel Core 2 Extreme QX97754 / 43.2 GHz150 WMar 2008
Intel Xeon L54104 / 42.33 GHz50 WMar 2008
Intel Xeon L54204 / 42.5 GHz50 WMar 2008
Intel Xeon L54084 / 42.13 GHz40 WFeb 2008
Intel Xeon E54054 / 42.0 GHz80 WNov 2007
Intel Xeon E54104 / 42.33 GHz80 WNov 2007
Intel Xeon E54204 / 42.5 GHz80 WNov 2007
Intel Xeon E54304 / 42.67 GHz80 WNov 2007
Intel Xeon E54404 / 42.83 GHz80 WNov 2007
Intel Xeon E54504 / 43.0 GHz80 WNov 2007
Intel Xeon E54624 / 42.8 GHz80 WNov 2007
Intel Xeon E54724 / 43.0 GHz80 WNov 2007
Intel Xeon X54504 / 43.0 GHz120 WNov 2007
Intel Xeon X54604 / 43.17 GHz120 WNov 2007
Intel Xeon X54724 / 43.0 GHz120 WNov 2007
Intel Xeon X54824 / 43.2 GHz150 WNov 2007
Intel Xeon L53354 / 42.0 GHz50 WAug 2007
Intel Xeon X53654 / 43.0 GHz150 WAug 2007
Intel Xeon E53354 / 42.0 GHz80 WNov 2006
Intel Xeon E53454 / 42.33 GHz80 WNov 2006
Intel Xeon X53554 / 42.67 GHz120 WNov 2006
Intel Xeon 51482 / 22.33 GHz40 WSep 2006
Intel Xeon 51102 / 21.6 GHz65 WJun 2006
Intel Xeon 51202 / 21.87 GHz65 WJun 2006
Intel Xeon 51302 / 22.0 GHz65 WJun 2006
Intel Xeon 51402 / 22.33 GHz65 WJun 2006
Intel Xeon 51502 / 22.67 GHz65 WJun 2006
Intel Xeon 51602 / 23.0 GHz80 WJun 2006
Intel Xeon 50302 / 42.67 GHz95 WMay 2006
Intel Xeon 50502 / 43.0 GHz95 WMay 2006
Intel Xeon 50602 / 43.2 GHz130 WMay 2006
Intel Xeon 50632 / 43.2 GHz95 WMay 2006
Intel Xeon 50802 / 43.73 GHz130 WMay 2006
Intel Xeon 50202 / 42.5 GHz95 W2006
Intel Xeon 50402 / 42.83 GHz95 W2006

Frequently asked questions

Which processors fit Socket 771?

Dual-socket Clovertown parts in LGA 771 packages, including the 3 GHz X5365 at 150 W and the 2 GHz L5335 at 50 W covered here, plus single-CPU Conroe-CL parts such as the 1.866 GHz Celeron 445 at 65 W. Standard Woodcrest dual-core Xeons use different boards.

Is Socket 771 the same as LGA 775?

No. Both have land grids with incompatible key placement, and Socket 771 adds server power delivery that LGA 775 boards lack. Adapters exist but need BIOS microcode support and server validation.

What memory does Socket 771 use?

DDR2 memory through the server board chipset in two channels. A move to DDR3 means a move to LGA 1366 with a new board.

How many PCIe lanes does Socket 771 provide?

No lanes come from these CPUs. A front side bus ties the CPU to the server chipset at up to 1066 MT/s on Conroe-CL parts, while PCIe slots hang off the chipset.

Sources and verification

  1. Conroe (microprocessor) (Wikipedia)
  2. LGA 771 (Kita mirror)

Facts last checked against these sources on . Page last edited on .