Cyrix 486DLC
Cyrix Cx486DLC-33GP processor in a FX-3000 motherboard
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This page is dedicated to the Cyrix 486DLC chips. They go into 386 socket motherboards (PGA-132) and offer higher performance than the AMD Am386DX-40. The highlight of this chip is the 1 KB of internal L1 cache. The cache is not always enabled by default, depending on motherboard, but can also be set via software. I tested this processor on my FX-3000 motherboard and this one has a BIOS setting, enabling L1 cache by default. Below you can see the performance difference between having the 1 KB L1 cache enabled or disabled.
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Cyrix Cx486DLC-33GP and Cx486DLC-40GP benchmark results
Here are DOS benchmark results showing the performance difference with Cache enabled and disabled. To download a Boot Floppy with these benchmarks go here.
Cyrix Cx486DLC-33GP and Cx486DLC-40GP benchmark results with 1 KB L1 Cache enabled and disabled and comparing to an AMD Am386DX-40
Cyrix 486SRx/DRx2 Installation Floppy Disk
This installation disk works fine with the Cx486DLC processors and optimally configures the system for these processors. Below you will find a Floppy image which you can use to create the Floppy Disk as well as screenshots showing the installation process.
| cyrix_486slc2_install.img |
DOS tools to enable / disable the 1 KB L1 cache
These tools are on the above installation disk but if you don't want to install the driver permanently and just want to check or set the L1 Cache from a Floppy for example you can use the files below.
I found that this program can fail at enabling the Cache! To use it type:
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Cyrix cx486_cd utility
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I found this program reliably disable the Cache! To use it type:
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Cyrix no_cache utility
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This program worked reliably for me in enabling and disabling the 1 KB L1 cache. It has a nice graphical user interface too. Press C to toggle the Cache on or off and then you must press W to write the changes to the CPU register!
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Cyrix cx486 utility
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