32bit vs 64bit speed difference

[Kurgen]

this follows from an earlier post I made. I have 2 pcs that due to limitations of 3rd party addon software in 1 package, they MUST stay as 32bit.. (no questions on this part , as it has been dealt with)

what I want to know apart from 4gb limit. How much operational difference will there be by staying on 32bit. Assuming that the RAM is being used up.

ie is win 64bit 100% faster than 32bit.

 

[Kurgen]

the main Application is AutoCAD 2010, which is available in both 32 and 64. the problem is a small piece of addon software which is end of life. it wont work in any 64 bit environment, will just crash to desktop and the supplier has confirmed this. the drawing are small and 2d, so can live with 4gb

 

[Kurgen]

to much hastle, plus you need 2 windows licenses