Need Help please! Memory additions

[mrharrod]

Hello,

I have these...

OCZ 4GB DDR3 PC3-10666C6 1333MHz ReaperX (2x2GB) Dual Channel DDR3 (OCZ3RPX1333EB4GK)

on this mother board...
Asus P5E3 Premium/Wifi@N Intel X48 (Socket 775) PCI-Express DDR3 Motherboard

I want to add an addtional 4gb but from what I hear, adding the above kit again is not possible due the heatsinks on the RAM

So, is it possible to install these alongside the others?.
Crucial Ballistix Tracer 4GB DDR3-1333


Thanks for any help,
Chris.