Asus have released a small Utility Tool which lets you unlock the GTX465 to GTX 470. Yep! That's right , As rumoured before the Early batches of GTX 465 were GTX 470 indeed and the software will let you unlock the Cuda Cores to give the same performance as the GTX 470. Here's a test of the Utility showing a GTX 465 unlocked.
The software can be downloaded here and should be use at your own risk.