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Enable the External Cache
The external cache is the cache that sits between the processor and the system memory. It is often called the "secondary cache" or "level 2 cache" (the internal processor cache is the primary or level 1 cache.) Read here for more details. This cache is very important to system performance and the BIOS setting that controls it should be enabled. Leaving the cache disabled will lead to a significant loss of performance.
Note: This setting is one of
those that you should always be able to enable. If you cannot enable this option then you
probably have a hardware or configuration problem, and you should have it addressed
instead of merely disabling the feature. A level 2 cache that can't be enabled indicates a
cache problem or motherboard problem.
Next: Enable Fast A20 Gating