In this article Follow your favorite stocks CREATE FREE ACCOUNT Dado Ruvic | Reuters With Arm slated to start trading on the Nasdaq on Thursday, investors are considering the potential upsides — and downsides — of investing in the company. The British chip designer itself flagged several risks in its IPO prospectus, ranging from its China business to geopolitics, but one potential threat has gained traction as its listing nears. It's called RISC-V, pronounced "risk five" — a rival chip design that is backed by some of Arm's own customers. While analysts told CNBC it's not an immediate threat, Arm…