The FC-PGA package is short for flip chip pin grid array, which have pins that are inserted into a socket. These chips are turned upside down so that the die or the part of the processor that makes up the computer chip is exposed on the top of the processor. By having the die exposed allows the thermal solution can be applied directly to the die, which allows for more efficient cooling of the chip. To enhance the performance of the package by decoupling the power and ground signals, FC-PGA processors have discrete capacitors and resistors on the bottom of the processor, in the capacitor placement area (center of processor). The pins on the bottom of the chip are staggered. In addition, the pins are arranged in a way that the processor can only be inserted one way into the socket. The FC-PGA package is used in Pentium® III and Intel® Celeron® processors, which use 370 pins.
The first Pentium III core, Katmai, was not much different from its predecessor, Pentium II Deschutes core. Like the Deschutes-based Pentium II processors, the Katmai-based Pentium III CPUs had 512 KB back-side L2 cache running at half of the core frequency. These Pentium 3 CPUs were packaged in SECC 2 package, plugged into Slot 1 connector, used the same 0.25 micron manufacturing technology, and even had the same core voltage as Pentium IIs. As a result new Pentium 3 processors had good compatibility with old Pentium II motherboards.
The major feature of the Katmai core was SSE instruction set - 70 new SIMD instructions. These instructions were originally called KNI, or Katmai New Instructions. The SSE instructions could significantly improve performance of multimedia and graphics applications, but only if the applications were recompiled to take advantage of new instructions.
Another new "feature" of Pentium III processor was Processor Serial Number, or PSN. The PSN was unique for each Pentium III CPU, and it could be used to uniquely identify the computer. Due to privacy concerns this feature was by default disabled on many motherboards.
All CPUs with Katmai core were released during short period of time. First Pentium IIIs, running at speeds 450 and 500 MHz, were introduced in February of 1999. Just in 7 months, in September 1999, Intel released the latest and the fastest Katmai 600 MHz CPU with 133 MHz FSB.
To compare different versions of Pentium III CPUs please see Intel desktop Pentium III CPU chart.
Related Links
Architecture
Identification
Pinouts
Support chips
Pentium III family
At a glance
Introduction:
1999
Technology:
0.25 micron
Frequency (MHz):
450 - 600
L2 cache size (KB):
512
Intel Pentium III 400 - DC1EC501A400 KATMAI
400 MHz
512 KB L2 cache
Single Edge Contact cartridge (slot 1)
This early engineering sample of Pentium III processor is interesting for a few different reasons:
It was manufactured about 8 months before the launch of Pentium III family.
The processor is clocked at 400 MHz, and production version of Pentium 3 400 MHz was never officially released.
The processor has unusual part number. It's also curious that the "Katmai" core name is printed on the CPU next to the part number.
Intel Pentium III 400 - 80525PZ400512
400 MHz (133 MHz bus)
512 KB L2 cache
Single Edge Contact cartridge 2 (slot 1)
Produced later than the DC1EC501A400 CPU this engineering sample has very significant feature - 133 MHz front side. Increasing front side bus speed from 100 MHz to 133 MHz allowed to increase processor performance by 5% - 10% on average.
It's worth to note that this processor was manufactured almost 11 months before the release of first Katmai processors with 133 MHz bus speed
Socket 775 (LGA775)
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Socket 775 (LGA775) is a Land Grid Array (PGA) socket used for the most recent generations of desktop Intel microprocessors starting from Pentium 4 and up to Core 2 Quad / Core 2 Extreme families. The socket LGA775 supports Intel CPUs from 1.8 to 3.8 GHz with Front-Side Bus frequencies ranging from 533 MHz to 1066 MHz. This socket superseded socket 478.
The Socket 775 differs from all earlier x86 sockets in the sense that it doesn't have pin holes. Instead, the socket has 775 gold-plated contacts arranged as a grid 33 x 30 contacts with 15 x 14 section de-populated in the center, with one corner contact and 4 contacts on two sides on the socket removed. After the processor is placed into the socket it has to be secured by pushing socket's load lever down. The LGA775 socket is guaranteed to last at least 20 insert cycles.
The size of LGA775 socket is 1.48" x 1.48" (3.75 cm x 3.75 cm), or about 15% larger than the size of socket 478. At the same time the socket 775 has 60% more contacts. The increase in the number of contacts without equivalent increase of socket size was achieved by reducing the distance between contacts. Another advantage of the new socket design is the lower resistance of the contacts, which reduces the amount of heat generated by socket and socket contacts.
LF-LGA775 socket is RoHS-compliant version of LGA775 socket.
Supported processors
Celeron D (2.4 GHz - 3.6 GHz)
Pentium Dual-Core desktop (1.6 GHz - 1.8 GHz)
Pentium 4 (2.66 GHz - 3.8 GHz)
Pentium D (2.66 GHz - 3.6 GHz)
Pentium 4 Extreme Edition (3.2 GHz - 3.73 GHz)
Core 2 Duo (1.8 GHz - 3 GHz)
Core 2 Quad (2.4 GHz - 2.66 GHz)
Core 2 Extreme (2.66 - 3 GHz)
Xeon (1.86 GHz - 2.66 GHz)
There are no CPUs from other manufacturers compatible with socket LGA775.
Socket 939
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Socket 939 is a PGA socket designed for desktop K8 microprocessors. The socket is primarily used with Athlon 64, Athlon 64 X2 and Athlon FX microprocessors. AMD also manufactured uni-processor single and dual-core Opteron processors for the socket 939, although these processors were just re-branded Athlon 64/64 X2 CPUs with larger level 2 cache. In addition to that small number (compared to the total number of processors for this socket) of socket 939 Sempron processors was produced for this socket.
The socket can be used with processors with internal frequencies from 1.8 GHz to 3 GHz, or with rated frequencies 3000+ - 4800+. All processors working in this socket have one HyperTransport link, dual-channel DDR memory controller, and support DDR-200 - DDR-400 unbuffered memory DIMMs.
Supported processors
Sempron / Sempron 64 (1.8 GHz - 2 GHz, or 3000+ - 3500+)
Athlon 64 (1.8 GHz - 2.4 GHz, or 3000+ - 4000+)
Athlon 64 X2 (2 GHz - 2.4 GHz, or 3800+ - 4800+)
Athlon 64 FX (FX-53 - FX-60)
Opteron (1.8 GHz - 3 GHz, or model 144 - model 156)
Dual-Core Opteron (1.8 GHz - 2.6 GHz, or model 165 - model 185)
There are no Intel or VIA processors compatible with this socket.
NOTE: Not all processors may be supported by all motherboards. Please see "Upgrading socket 939 motherboards" section below on how to determine what microprocessors can be supported by your motherboard.
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