So I have a Sram 9 speed chain that I bought in August when I first built up my bike with a 9 speed cassette. Now that I'm switching over to using a 10 speed cassette I still would like to use the chain; it has low mileage, hasn't stretched at all (if it has it's very minute), and it has the very useful powerlink which I like when I go to clean and lube the chain.

My question is: would this 9 speed chain work with a 10 speed cassette? Or do I have to buy a new chain which I would rather not do?