| 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 |
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This article is part of the CPU socket series |
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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.
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The main differences between Socket AM2 and AM2+ socket processors are as follows:
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 are instead forced 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:
The pin configuration of the AM2+ socket (940 pins)[2] is mechanically different from the AM3 socket (941 pins)[2]
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.
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