Cyrix MediaGX GXm-300GP 2.9V CPU

This CPU is a Cyrix MediaGX GXm-300GP 2.9V CPU and was pulled from a working system.


It was tested on a Socket 7 mainboard accepting the GXm CPU and is working fine.

This Cyrix MediaGX GXm-300GP 2.9V CPU is really special. It has integrated graphics and sound, which is common these days, but was a revolution back in 1997. It helped to build sub $1000 PCs for consumers, since expensive hardware like graphics and sound was already integrated and had not to be added by an add in card.

If you have a board which can use the Media GXm CPU, it is a great CPU for Windows 98SE / Win2000 retro gaming. Some Socket 7 mainboards will boot the CPU but will not offer sound/graphics as they lack chipset support. This CPU is the fastest of the Media GXm line.

If you do not have a mainboard which will work with this CPU, you may want to use the Cyrix MII 300GP instead. Check our offers for this CPU.


Under the picture you can find the specs of this CPU.



  •  

General information
TypeCPU / Microprocessor
Market segmentDesktop
FamilyCyrix GXm
CPU part number
  • GXm-300GP 2.9V 85C is an OEM/tray microprocessor
Frequency300 MHz
Bus speed33 MHz
Clock multiplier9
Package320-pin Ceramic Staggered Pin Grid Array
1.952" x 1.952" (4.96 cm x 4.96 cm)
SocketSPGA320
Architecture / Microarchitecture
Instruction setx86
Manufacturing process0.35 micron 4-layer metal CMOS process
Data width32 bit
The number of CPU cores1
The number of threads1
Floating Point UnitIntegrated
Level 1 cache size16 KB 4-way set associative write-back unified instruction and data cache
Physical memory1 GB
Extensions & TechnologiesMMX instructions
Low power features
  • APM support
  • CPU only suspend
  • Suspend modulation
  • Full 3V suspend
On-chip peripherals
  • PCI controller
  • Display controller and 2D Graphics accelerator
  • 64-bit synchronous DRAM controller
  • Memory Management Unit
  • Internal Bus Interface Unit
Electrical / Thermal parameters
V core2.9V ± 0.15V
V I/O or secondary3.3V ± 0.16V
Maximum operating temperature85°C
Typical/Maximum power dissipation6.2 Watt / 11.5 Watt
Notes on Cyrix GXm 300 MHz
  • Interfaces with Cx5520 or Cx5530 companion chips