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Ensure All RAM Is Being Cached If You Have Over 64 MB of RAM

Most PCs today use 64 MB of RAM or less, and this is probably the reason why the problems associated with using more than 64 MB of RAM are not widely known. Some chipsets (and hence motherboards) won't support over 64 MB of RAM at all, while others will support it but will not cache all of it. This is discussed in detail here.

Some motherboards will support over 64 MB of RAM and cache it, but only if you specifically tell the motherboard that you are using over 64 MB. This is controlled with a BIOS setting that is usually called "Cacheable DRAM Size" or "Cache Over 64 MB of RAM". I would recommend strongly that you enable this if using more than 64 MB of memory, of course.

Note: It is unusual in my experience for problems to result from using this setting, so if you are having trouble enabling this you may want to troubleshoot your memory or motherboard.

Next: Enable System BIOS Shadow Caching

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