will this run a 144hz monitor at 144hz?

The product supports video resolutions up to 2560 x 1600, but there is no mention of support for 144Hz refresh rates.

is this cable used to extended your desktop screen to multi monitors?

This cable will connect your USB-C capable computer to a single external monitor. If you want more than one external monitor, you likely will need an active adapter such as USB-C to dual display port output. Check Startech for these products.

Questions & Answers: StarTech.com CDP2DVIMM2MB USB-C to DVI Cable - 6 ft / 2m - 1080p - 1920x1200 - USB-C DVI Monitor Cable - USB C Cable - Computer Monitor Cable

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StarTech.com CDP2DVIMM2MB USB-C to DVI Cable - 6 ft / 2m - 1080p - 1920x1200 - USB-C DVI Monitor Cable - USB C Cable - Computer Monitor Cable

Eliminate clutter by connecting your USB Type-C computer directly to a DVI display without additional adapters
Reduce clutter with a compact 2 m (6 ft) adapter cable
USB C to DVI Cable / DVI Monitor Cable / Computer Monitor Cable / USB-C to DVI cable / USB Type C to DVI Cable / USB C to DVI Converter / USB C to DVI Adapter Cable / USB-C Cable / USB-C to DVI / USB Type C Cable / USB Type C to DVI / USB-C DVI / USB Type C DVI / USB C to DVI Port / USBC

$39^.99 –