Using FastCode and RtlVcl Optimize together

I am using both FastCode and 开发者_开发百科RtlVcl Optimize in my project. Can they conflict? Should I use them together?

Delphi 7

http://fastcode.sourceforge.net/

http://cc.embarcadero.com/Item/25537

I use them both (in d2010) with no problems