A jumbo mortgage loan can come in many forms, one of which is a jumbo loan with an adjustable mortgage rate. The adjustable mortgage rate or ARM is similar to a conforming ARM, but is slightly different. The jumbo loan comes with higher interest rates than the standard conforming loan. The conforming loan is below $333,700 and has a lower interest rate than the jumbo loan, because the amount of money loaned is less. When you recieve as much in a loan as you do with a jumbo loan, then you will pay higher interest rates, but with an adjustable rate jumbo loan the interest rate will be much lower, about two to three percent.