Many cars, including the Mazda CX-5 and Volkswagen Golf, use variable valve timing to maximize fuel efficiency and performance.

FORBES: 10 Ways Automakers Are Helping You Spend Less On Gasoline

"With this release, NVIDIA has managed to increase the overall gaming performance under Linux, " said Doug Lombardi, vice president of marketing at Valve.

ENGADGET: NVIDIA gets a little help from Valve, tweaks GeForce drivers just as Steam for Linux beta launches