Socket 7 (Socket7)
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Socket 7 was introduced by Intel for it's Pentium 133 - 200 MHz processors and for Pentium MMX processor family. The major feature of the new socket was support for dual plane voltage - the socket could supply different voltages to processor core and I/O logic. At the same time, the socket 7 was backward compatible with socket 5, and it was possible to run older (single voltage) processors in socket 7 motherboards. For their next generation of processors Intel chose different socket type - slot 1, and completely abandoned socket 7. Luckily, Intel competitors continued to support socket 7 architecture, and they even enhanced it by creating a "Super socket 7" specification by adding support for 100 MHz bus frequency, backside L2 cache and frontside L3 cache.
Socket 7 has 321 pin holes arranged as 37 x 37 pin matrix. The socket has the same size as the Socket 5, but the socket 5 has only 320 pin holes. The extra pin on socket 7 processors is not electrically connected and it's main purpose is to prevent socket 7 processors to be inserted into socket 5 motherboards.
Supported processors
AMD K5 (75 MHz - 200 MHz)
AMD K6 (166 MHz - 300 MHz)
AMD K6-2 (200 MHz - 570 MHz, often requires 100 MHz bus support)
AMD K6-III (333 MHz - 550 MHz, often requires 100 MHz bus support)
Cyrix 6x86, 6x86L and 6x86MX (90 MHz - 266 MHz)
Cyrix MII (233 MHz - 433 MHz)
IBM 6x86, 6x86L and 6x86MX (90 MHz - 300 MHz)
IDT Winchip C6 (180 MHz - 240 MHz)
IDT Winchip 2 (200 MHz - 240 MHz)
Intel Pentium (non-MMX) (75 MHz - 200 MHz)
Intel Pentium MMX (166 MHz - 233 MHz)
Rise Technology MP6 (150 MHz - 366 MHz)
ST 6x86 (90 MHz - 166 MHz)
Compatible package types
296-pin staggered Plastic Pin Grid Array (PPGA)
296-pin staggered Ceramic Pin Grid Array (CPGA or SPGA)
296-pin Flip-Chip staggered Ceramic Pin Grid Array
321-pin ceramic Ping Grid Array (CPGA)
Upgrading socket 7 motherboards
Although many socket7 microprocessors will fit into your motherboard, not all of them may be supported by the board. To determine the fastest processor for your motherboard you'll need to:
- Determine manufacturer and model of your motherboard,
- Search on manufacturer's website for the motherboard model.
For upgrade information for ABIT, ASrock, ASUS, DFI, ECS, Gigabyte Technology, Jetway, MSI, PC Chips and Shuttle motherboards please check CPU-Upgrade motherboard database.
Socket 478 (mPGA478B)
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Socket 478 (mPGA478B) is a Pin Grid Array (PGA) socket for microprocessors based on Intel NetBurst architecture. This socket was introduced in August 2001 as replacement for short-lived socket 423. The socket 478 supports desktop and mobile Pentium 4 and Celeron processors from 1.4 GHz to 3.46 GHz with effective front-side bus frequencies 400 MHz - 1066 MHz (100 MHz - 266 MHz QDR). This socket was phased out in favour of socket 775 (LGA775).
One major difference between the socket 478 and older sockets is the socket size. The distance between pin holes in socket 478 is twice smaller than the distance between pin holes in the socket 370, which was used by older Celeron, Pentium and Pentium III families, and in the socket 423 used by first generation of Pentium 4 microprocessors. This results in much smaller socket size - only 1.38" x 1.38" (3.5 cm x 3.5 cm). Another difference between socket 478 and earlier sockets is the arrangement of pins. Pentium and newer CPUs, including socket 423 Pentium 4 microprocessors, had pins arranged as two grids where one grid was diagonally shifted relative to another grid by 1/2 of the distance between pins. In mPGA478B the pins are arranged as one grid, that is the same way as in Intel 80486 and older microprocessors.
The mPGA478B has grid size 26 x 26 with a 14 x 14 section removed from the center of the grid. Two pin-holes in one corner of the socket are plugged, so there is only one way to install the CPU. The total number of pins is (26 x 26) - (14 x 14) - 2 = 478.
Supported processors
Celeron Willamette (1.5 GHz - 2 GHz)
Celeron Northwood (1.5 GHz - 2.8 GHz)
Celeron D in 478-pin micro FC-PGA4 package (2.13 GHz - 3.2 GHz)
Desktop Intel Pentium 4 (1.4 GHz - 3.4 GHz)
Desktop Intel Pentium 4 Exteme Edition (3.2 GHz - 3.46 GHz)
Mobile Celeron (1.2 GHz - 2.5 GHz)
Mobile Pentium 4 processors in micro FC-PGA4 package (2.4 GHz - 3.46 GHz)
Mobile Pentium 4-M processors (1.4 GHz - 2.6 GHz)
Note: All processors are in 478-pin micro FC-PGA2 package, unless stated otherwise.
Mobile Pentium III-M and Pentium M microprocessors use different type of socket. There are no CPUs from other manufacturers compatible with socket 478.
Compatible package types
478-pin micro FC-PGA2 (with integrated heatspreader)
478-pin micro FC-PGA4 (with integrated heatspreader)
Please note that there are three different 478-pin packages, and only one of those packages is compatible with socket 478. The picture on the right shows the package that fits into the mPGA478B socket.
Upgrading socket 478 motherboards
Even though there are many Pentium 4 and Celeron CPUs that will fit into your motherboard, not all of them may be supported by the board. To determine the fastest processor you can upgrade to you'll need to:
- Determine manufacturer and model of your motherboard,
- Search on manufacturer's website for the motherboard model.
For upgrade information for ASUS, DFI, ECS, Gigabyte Technology, Jetway, MSI and PC Chips motherboards please check CPU-Upgrade motherboard database.
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