corsair question, please reply

does anybody know the difference between XLPT and XLPRO. i've read that the pro model has a more effective heatspreader, and ofcourse the coloured lights on top. besides this they are the same. is it worth buying the pro over the pt, i have an amd x2 3800+,msi k8n sli platinum, gf7800gt and i'd like to overclock a little, so i guess the improved heatspreader would be better this is the 1gb kit by the way