CYRIX REVEALS PRODUCT DETAILS ON M1
Fastest 586 Design Available in Early 1995

Richardson, Texas - November 21, 1994 -- Cyrix Corporation (NASDAQ: CYRX),
a manufacturer of high performance x86 microprocessors, has unveiled
details on the first product from its M1 architecture. This 586-class
microprocessor design is both superscalar and superpipelined and is
targeted to be the fastest x86 CPU for PCs. Cyrix designed this initial
586 CPU for the high-end business and consumer markets where superior
performance on today's and tomorrow's x86 software base is required. This
586 will also be ideal for dual processor desktop systems.

PRODUCT DETAILS

Cyrix's first 586 product based on the M1 architecture will be produced in
a 296 pin SPGA package, the same package used by the Intel P54C. This
microprocessor includes a 64-bit data bus and a single 64-bit enhanced
x87-compatible floating point pipeline. Its on-chip FPU is enhanced by a
four-instruction queue and four independent, 64-bit write buffers.

Cyrix's 586 microprocessor includes a unique combination of a 16K unified
instruction and data cache and a fully associative dedicated 256 byte
instruction line cache. The unified cache is dual-ported to allow for two
simultaneous fetches, reads, writes or combinations of any two. This large
unified cache allows Cyrix's 586 to achieve a high cache hit rate.

Cyrix has also included the same System Management Mode (SMM) used across
its entire line of processors. Other power management features include an
auto-power down math coprocessor and a hardware method for placing the M1
in suspend mode. These unique features, combined with 3.3 volt operation,
provide a power management environment that's easy to use and an ideal
solution for today's "green PCs."

The initial 586 product from Cyrix's M1 architecture requires a 3.3 volt
supply and includes 5 volt tolerant I/O buffers. It will be clock doubled
and is projected to operate at 50/100 and above.

ARCHITECTURAL FEATURES

Cyrix's first 586 microprocessor continues the company's technical heritage
of silicon-based innovation using unique microcode. The M1 architecture
not only overcomes such performance barriers as data dependencies, change
of flow instructions and resource conflicts, but also brings the end user
a superior performance advantage without the need to wait for recompiled
software. Cyrix chose instead to design advanced features into the
hardware to overcome these performance barriers.

The initial 586 uses both superscalar and superpipelined technologies, and
other architectural innovations, to allow software to execute more
efficiently in the processor. Superpipelining divides the pipeline into 7
stages, a design that provides for higher frequencies and better
performance. Register renaming provides 32 general purpose registers,
rather than the 8 registers available in x86 predecessors, including the
Pentium, supplying a substantial performance increase. Data and operand
forwarding, true speculative execution and out-of-order completion are
additional performance enhancements on the Cyrix 586 microprocessor.

MANUFACTURING AND AVAILABILITY

The M1 product family will be manufactured by both IBM Microelectronics and
SGS Thomson using a .5 micron CMOS process. Initial product will be
manufactured using triple-layer metal. Cyrix's first 586 microprocessor
will be sampling in Q4 and in production in early 1995.

COMPANY BACKGROUND

Cyrix Corporation, founded in 1988, designs, develops and markets high
performance microprocessors and open architectural environments for the
personal computer industry. Cyrix has demonstrated the ability and
commitment to bring innovative and compatible technology to market in an
impressive design cycle time. Cyrix is a publicly held company traded on
NASDAQ.

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