Uncacheable speculative write combining (USWC), is a computer BIOS setting for memory communication between a CPU and graphics card.123 It allows faster communication than the "uncachable" setting (the alternative to USWC in the BIOS), as long as the graphics card supports write combining (which most modern cards do), allowing data to be temporarily stored in write combine buffers (WCB) and released in burst mode rather than single bits.
References
References
- "Write Combining Memory Implementation Guidelines" (PDF). Intel.
- "Using the new Intel Streaming SIMD Extensions (SSE4) for audio, video and image apps". Intel, Embedded Systems Conference.
- "What is USWC (Uncachable, Speculative Write-Combining)?". computerhope.com.