Question for JF-AMD

I have got a supermicro H8QGL-6F ( quad socket motherboard ) with only 2 opterons 6128 HE. Now i want to buy two others 6128 but not HE. So my question is : is it possible to mix opterons 6128 with 6128 HE on the same motherboard ?

Thanking you in advance for the answer .