Did I get it right this time?
Almost. While it's true that OpenCL is related to processing and not memory, the simultaneous window open limitation we discussed related to your 256 MB VRAM in your graphics card is related to OpenGL, not OpenCL. The problem is not that your Mac doesn't have enough processing power to handle many images at once, it's that OpenGL doesn't have enough VRAM to handle the enhanced display of many images at once. You can either get more VRAM (a new card) or turn off OpenGL.
As for Grand Central, yes, it will allow more-efficient multicore operation, which in concert with OpenCL can allow it to spread processing across multiple cores AND multiple processing units (CPU, GPU). Again, how this would be utilized in a Photoshop workflow remains to be seen. It's possible Adobe won't take advantage of this until CS5 or later or not at all. I expect once 10.6 drops on Fri, we'll start seeing more in-depth reports and benchmarks. Again, though, this part is related to processing (CPU/GPU) not necessarily image display (OpenGL). But of course OpenCL can potentially work behind OpenGL to calculate faster what OpenGL will help display, thereby enhancing the entire experience. But it's all too early to see how this will all come together in the real world.
