Socket AM2+

Socket AM2+

Type	PGA-ZIF
Chip form factors	Ceramic Pin Grid Array (CPGA) Organic Pin Grid Array (OPGA)
Contacts	940
FSB frequency	200 MHz System clock up to 2.6 GHz HyperTransport 3.0
Processors	Athlon 64 Athlon 64 X2 Athlon II Opteron Phenom series Phenom II series
This article is part of the CPU socket series

Socket AM2+ is a CPU socket, which is the immediate successor to Socket AM2 that is used by several AMD processors such as Athlon 64 X2. Socket AM2+ is a mid-migration from Socket AM2 to Socket AM3 and both AM2+ and AM2 socket CPUs and motherboards have the potential to operate together. Actual interoperability depends upon other factors, especially the availability of compatible BIOS software, and some PC retailers, such as Dell, have not provided compatible BIOS versions that allow use of socket AM2+ CPUs on their products utilizing socket AM2 motherboards, such as the Inspiron 531.

Technical specifications

The main differences between Socket AM2 and AM2+ socket processors are as follows:

HyperTransport 3.0 operating at up to 2.6 GHz
Split power planes: one for the CPU cores, and the other for the Integrated Memory controller (IMC). This will improve power savings, especially with integrated graphics, if the CPU cores are in sleep mode but the IMC is still active.

While technical documentation was readily available for earlier generations of AMD processor sockets, the "AM2r2 Processor Functional Data Sheet" (AMD document number 41607) has not been made publicly available.

AMD confirmed that AM2 processors will work on AM2+ motherboards and AM2+ processors will work on AM2 motherboards. However, the operation of AM2+ processors on AM2 motherboards will be limited to the specifications of Socket AM2 (1 GHz HyperTransport 2.0, and one power plane for both cores and the IMC). AM2 processors do not benefit from the faster HyperTransport 3.0 and separate power planes on AM2+ motherboards. As with AM2 components, AM2+ CPUs and motherboards are designed to use DDR2 RAM exclusively.

Many manufacturers, such as Dell in the case of their Inspiron 531, have yet to (and may choose not to) release BIOS updates that would enable this compatibility. As a result, some consumers are unable to upgrade their PCs with AM2+ CPUs despite this being technically possible, and instead would have to buy a new motherboard to upgrade the processor. MSI has simply stated that their AM2 motherboards are not compatible with AM2+ processors.^[1]

AMD confirmed that there is an upgrade path from Socket AM2+ to AM3:

AM3 processors work on AM2+ motherboards due to the presence of both the DDR2 and DDR3 memory controllers on the processor
AM2+ processors do not work on AM3 motherboards due to the processor's lack of a DDR3 memory controller

The pin configuration of the AM2+ socket (940 pins)^[2] is mechanically different from the AM3 socket (941 pins)^[2]

Hybrid motherboards

An A790GXH motherboard that can support AM2, AM2+ and AM3 socket CPUs

Some motherboard manufacturers (i.e. ASRock, Jetway, and MSI) have released hybrid motherboards that are equipped with an AM2+ socket and both DDR2 and DDR3 memory slots. These boards permit the use of AM2/AM2+ processors with DDR2 RAM, or AM3 processors with either DDR2 or DDR3 RAM.

Successors

Socket AM3

Main article: Socket AM3

The sole principal change from AM2+ to AM3 is support for DDR3 SDRAM.

Socket AM3+

Main article: Socket AM3+

AM3+ is a modification of the AM3 Socket designed for CPUs which use the Bulldozer microarchitecture.

References

↑ K9N SLI, MSI, archived from the original on 2008-06-27, retrieved 2012-01-10
1 2 Tom's Hardware Modding And Overclocking–Doable?, Tomshardware.com, 2009-02-09, retrieved 2012-01-10

External links

AMD sockets and chipsets

AMD sockets

Desktop sockets	Super Socket 7 Slot A Socket A Socket 754 Socket 939 Socket AM2 Socket AM2+ Socket AM3 Socket AM3+ Socket FM1 Socket FM2 Socket FM2+ Socket AM1 Socket AM4

Mobile sockets	Socket A Socket 563 Socket 754 Socket S1 Socket FT1 (BGA413) 2011 Socket FP2 (BGA827) 2012 Socket FS1 Socket FT3 (BGA769) 2014 Socket FP3 (µBGA___) June 2014

Server sockets	Socket A Socket 940 Socket F Socket F+ Socket G3 (cancelled) Socket G34 Socket C32

Motherboard chipsets List of AMD chipsets

ATI chipsets	IGP 300 series/RX380 Radeon Xpress 200 CrossFire Xpress 3200 Radeon Xpress 1250

AMD chipsets	480X/570X/580X 690 Series 7-Series 8-Series 9-Series

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