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.
This setting enables faster communication compared to the "uncachable" option (the alternative to USWC in the BIOS), as long as the graphics card supports write combining, which is common for modern cards. This allows data to be temporarily stored in write combine buffers (WCB) and released in bursts instead of individual bits.