Apple is selling a 4K monitor from Sharp that could allay concerns of users looking to buy the upcoming Mac Pro desktop for ultra-high definition content creation.Sharp's PN-K321 4K Ultra HD LED monitor, which displays images at a 3840 x 2160 pixel resolution, is on sale for €3,999 (US$5,444) through Apple's U.K. and other European online stores. The monitor is not yet listed on Apple's U.S. online store.Some TVs and monitors already support 4K, the successor to current high-definition specifications in which images are displayed at a 1920 x 1080 pixel resolution. This Sharp monitor shows "four full HD screens on a single seamless display," according to the product description on the website.Apple this month will ship the Mac Pro high-end desktop, which is largely aimed at creative professionals and engineers. The desktop has multiple graphics cards that will allow the creatio
