As far as I know, only Macau accept POSB which levied a S$5.00 fee and whatever exchange rate. Not so sure for other bank
I have a Bank of China Credit Card. Actually should be 2. Once of them is a "Union Pay" type which can be use in PRC. Most PRC shop don't accept Visa/Master. Even big resturant. Some bigger hotel accept Visa/Master.
Do check if they levied an admin charge for using Visa/Master. In PRC. Cash is really KING.. I was once ran out of RMB.. Lan lan went back to HK as can use Credit Card.