Socket M

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Socket M
Chip form factorsFlip-chip pin grid array
Contacts478 (not to be confused with the previous Socket 479)
FSB frequency533 MT/s, 667 MT/s, 800MT/s
Intel Core Solo
T1200, T1250, T1300, T1350, T1400, T1500[1]
Intel Core Duo
T2050, T2250, T2300, T2300E, T2330, T2350, T2400, T2450, T2500, T2600, T2700[2]
Intel Core 2 Duo
T5200, T5300, T5500, T5600, T7200, T7400, T7600, T7600G[3]
Intel Pentium Dual-Core
T2060, T2080, T2130
Intel Celeron M
Intel Celeron
1.66 GHz[4]
PredecessorSocket 479
SuccessorSocket P

This article is part of the CPU socket series
Inside of old Sony VAIO laptop (VGN-C140G)

Socket M (mPGA478MT) is a CPU interface introduced by Intel in 2006 for the Intel Core line of mobile processors.[5]

Technical specifications[edit]

Socket M is used in all Intel Core products, as well as the Core-derived Dual-Core Xeon codenamed Sossaman. It was also used in the first generation of the mobile version of Intel's Core 2 Duo, specifically, the T5x00 and T7x00 Merom lines (referred to as Napa Refresh), though that line switched to Socket P (Santa Rosa) in 2007. It typically uses the Intel 945PM/945GM chipsets which support up to 667 MHz FSB and the Intel PM965/GM965 which allows 800 MHz FSB support, though the Socket M, PM965/GM965 combination is less common. The "Sossaman" Xeons use the E7520 chipset.

Relation to other sockets[edit]

Socket M is pin-compatible with desktop socket mPGA478A but it is not electrically compatible.[6] Socket M is not pin-compatible with the older desktop Socket 478 (mPGA478B) or the newer mobile Socket P (mPGA478MN) by location of one pin; it is also incompatible with most[7] versions of the older mobile Socket 479. Pentium III-M processors designed for the first version of Socket 479 will physically fit into a Socket M, but are electrically incompatible with it.[8] Although conflicting information has been published, no 45 nm Penryn processors have been released for Socket M.

See also[edit]


  1. ^ "PPGA478 Yonah".
  2. ^ "PPGA478 Yonah".
  3. ^ "PPGA478 Merom".
  4. ^ "PPGA478 Sossaman".
  5. ^ Smith, Tony (3 Jul 2006). "Intel's multiple Meroms pin-incompatible - report". Retrieved 2019-02-12.
  6. ^ "Socket 479 (mPGA479M)". CPU-World. Retrieved 2011-09-24.
  7. ^ The version of Socket 479 for Intel Core processors was compatible with Socket M; see "Socket 479 (mPGA479M)". CPU-World. Retrieved 2010-01-16.
  8. ^ "Socket M (mPGA478MT)". CPU-World. Retrieved 2010-01-16.