Starting with Adobe Photoshop CS6, Mac users must have a 64-bit, multi-core system with at least OS X 10.6 Snow Leopard.

Adobe drops support for 32-bit Macs with Photoshop CS6.

Look, how many bits you choose to process in the privacy of your own home is entirely your business, but don't expect the latest Photoshop to work on anything less than a 64-bit multi-core Mac ...