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Uncacheable speculative write combining

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USWC stands for Uncacheable Speculative Write Combining. It is a computer BIOS setting for memory communication between CPU and graphics card. It allows for faster communication than the Un-Cachable setting, as long as the graphics card supports write-combining, which most or all modern graphics cards do.

Write-combining

Write-combining allows data to be temporarily stored in write combine buffers (WCB) and released in burst mode instead of writing single bits.

See also

Un-Cachable (UC), the alternative to USWC in the computer BIOS