Core 2 users, 64bit performance?

[Papajohn56]

Have you guys noticed a significant increase in performance in OSX 10.5 with the enhanced 64bit accessing? Thanks guys

 

[surfsnow]

Not confirmed, but I heard that the chip-set for MBP is not 64-bit so even the CPU is 64-bit, there is no 64-bit support on MBP.
Also as the 3GB memory barrier is caused by the same reason too...
Please correct me if I am wrong.