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KL VIA C7 M.jpg
Production: since 2005
Producer: VIA Technologies
Processor clock: 400 MHz to 2 GHz
FSB cycle: 100 MHz to 133 MHz
L2 cache size: 128 KB
Instruction set : x86
Microarchitecture : RISC
Base: Socket 479
Name of the processor core: Esther (C5J)

VIA C7 is a microprocessor family of VIA Technologies , the x86 - compatible are. The processors were developed by Centaur Technology , a subsidiary of VIA. The C7 series is the successor to the VIA C3 and the WinChip from IDT and is divided into the C7 , C7-M and C7-D .


Centaur microprocessors are developed with the main goal of lower production costs. To make this possible, it is necessary that the hold face as small as possible. This inevitably means that the processor architecture has to be very simple. Functional units that require large quantities of logic transistors , such as B. Integrated memory controller or Hyper-Threading . By relatively small number of transistors and the face banks and the resulting savings of expensive development work the price is permanently reduced. This results in a favorable price-performance ratio for these processors and also a lower energy requirement compared to other x86 processors .


All C7 processors are based on the Esther (C5J) processor core , which was officially presented on May 27, 2005. Due to the low energy consumption of the processor core, it should be used primarily in notebooks , thin clients , PVRs and similar devices. Esther is basically based on the Nehemiah + (C5P), but was u. a. equipped with an improved PadLock engine. In addition, support for SSE2 , SSE3 and the NX bit has been integrated. According to VIA Esther thanks to the power-saving technology PowerSaver 4.0 in idle mode receive only 0.1 watts of electrical power and thus better energy efficiency than Intel's Pentium M possess. As a further innovation, the new bus protocol VIA V4-Bus has been implemented, for which only the VIA CN700 and VIA CN800 models are currently available as chipset . The processor core is also used in the Eden series in the VIA Eden ULV and VIA Eden models.


The VIA C7 is a classic microprocessor for low-cost desktop PCs , whereby VIA particularly emphasizes the low energy requirement. However, since the processor lags behind corresponding competing products from AMD and Intel in terms of performance , it is seldom installed in corresponding PCs . It occurs mainly on the VIA EPIA - motherboards used.


VIA C7-M 1.2GHz

The VIA C7-M is a typical notebook processor and differs from the C7 in that it consumes even less energy.


With the VIA C7-D, VIA presented a variant of the C7 that complies with the RoHS guidelines of the European Union. As part of the marketing campaign, this processor was advertised with the slogan "Carbon-Free" due to its low power consumption.

Model data


  • Code name: C5J
  • L1 cache : 64 KB data + 64 KB instructions
  • L2 cache: 128 KB with processor clock
  • MMX , SSE , SSE2 , SSE3 , PowerSaver 4.0 , NX-Bit , PadLock -Engine (2 RNG, one ACE), SMP
  • VIA-V4 bus protocol with 100 and 133 MHz front side bus (quadpumped, FSB400 and FSB533)
  • Design: FCPGA, NanoBGA2, uses Intel's 479-pin infrastructure , all models are unsocketed and are directly soldered on
  • Operating voltage (VCore): 0.8V
  • Power consumption (max): 20 W
  • Release DATE: May 27, 2005
  • Manufacturing technology: 0.09 µm (SOI) at IBM
  • The size: 31.7 mm² with 26.2 million transistors
  • Clock rates: 400 MHz to 2 GHz
    • C7: 400, 500, 600, 800, 1000, 1200 and 1500 MHz
    • C7-M FSB400: 1.5 GHz
    • C7-M FSB533: 1600, 1867 and 2000 MHz
    • C7-M ULV FSB400: 1000, 1200 and 1500 MHz
    • C7-D FSB400: 1.5 and 1.8 GHz

See also

Web links