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Cyrix MediaGX build

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  • GiGaBiTe
    replied
    Nice build.

    I have one of those AMD 50x15 PICs that has a 400 MHz Geode GX in it and it's basically still a 486 on steroids. I never did try the utility to enable disabled features on it though. As it comes from the factory, it's locked down to Windows CE, you have to use an exploit to get a command prompt and flash a custom unlocked BIOS to it so it can boot other operating systems. Not at all expandable though, the only things you can change are the hard drive and DDR SODIMM memory module.

    Leave a comment:


  • jasa1063
    started a topic Cyrix MediaGX build

    Cyrix MediaGX build

    I was looking into building a Cyrix 5x86 system, but then decided on a Cyrix MediaGX system since this has a Cyrix 5x86 core. I thought this would be a much more interesting build. The biggest obstacle is finding a motherboard. I saw a video on this topic on the CPU Galaxy YouTube channel and he had a link to a seller on eBay. I ordered a motherboard, CPU and accessories. Here are the system specs:

    ECS P5GX-M motherboard
    Geode GXm-266P CPU @2.9v overclocked to 300MHz (Same as a MediaGX just sold by National Semiconductor after buying Cyrix)
    256MB (2x128MB) PC100 SDRAM
    3Com Etherlink III network card
    TopView ET6000 4MB video card
    8GB CompactFlash with a CF to IDE adapter
    1.44MB 3.5" floppy drive
    16x DVD
    Windows 98 SE with Unofficial Service Pack 3

    I opted not to use the onboard video as this made overclocking easier and tighter memory timings. I did end up using the onboard SB16 audio. The next issue to resolve was finding a way to tweak the MediaGX register settings. Thanks to this post on vogons.org, I was able figure out how to use CTCHIP34 to tweak the MediaGX CPU including enabling Branch Prediciton. I already posted some results in that thread.

    https://www.vogons.org/viewtopic.php...gister#p469004

    I have CTCHIP34 in my AUTOEXEC.BAT with the following parameters:

    CTCHIP34 cx586 /20:=7
    CTCHIP34 cx586 /0e8:=0f8

    I have no stability issues, Here the results of some DOS benchmarks.

    No tweaks applied:


    Speedsys v4.78 visual results

    3DBench 1.0c - 156.6 FPS
    Chris's 3D Benchmark - 320x200 - 124.3 FPS
    Chris's 3D Benchmark - 640x480 - 35.7 FPS
    PC Player - 320x200 - 48.7 FPS
    PC Player - 640x480 - 19.1 FPS
    Doom - Max Details - 86.54 FPS
    Quake - 320x200 - 35.2 FPS
    Quake - 640x480 - 13.7 FPS
    Norton SI 8.0 = 793.9
    Topbench 40a - 686
    SpeedSys 4.78 CPU Performance Index - 151.09

    Tweaks applied:


    Speedsys v4.78 visual results

    3DBench 1.0c - 162.3 FPS
    Chris's 3D Benchmark - 320x200 - 128.9 FPS
    Chris's 3D Benchmark - 640x480 - 35.7 FPS
    PC Player - 320x200 - 50.2 FPS
    PC Player - 640x480 - 19.7 FPS
    Doom - Max Details - 89.02 FPS
    Quake - 320x200 - 39.8 FPS
    Quake - 640x480 - 15.6 FPS
    Norton SI 8.0 - 1020.6
    Topbench 40a - 690
    SpeedSys 4.78 CPU Peformance Index - 179.82

    Overall this has been a fun build. It's basically like having a 486 system on steroids


    Computer front view

    Windows 98 SE with Cpu-Z info
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