I think your bigger issue is going to be 32bit vs 64bit. The maximum amount of memory you can assign to a 32bit ColdFusion JVM is going to be somewhere in the 1200 megabyte range for the heap, and 512 or so for the perm gen. If you had the Enterprise version of ColdFusion you could spawn more instances using the same configuration and cluster/load balance them. But in the end, if you want to take advantage of all that memory with just one instance, it's going to have to be 64bit ColdFusion.
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