Photoshop doesn't use OpenCL, and until CS4 it didn't even use any sort of Hardware accelerated graphics. Even now they use OpenGL, but the improvements barely extend beyond the UI. Here is an actual list of the changes:
GPU and OpenGL features and preferences | Photoshop and Bridge CS5, CS4
I think you may be confused. Laptops rarely have GPUs that aren't directly soldered onto the motherboard. RAM on the other hand is something can be bought off the shelf and upgraded yourself. An increase in RAM would allow you to work with larger files in photoshop without constant drive writes. You can buy SO-DIMMs of newegg, where as you can't purchase laptop GPUs much less replace them.
I don't think you quite understand how X11 forwarding works, since the files are kept locally on the server. VNC also doesn't transfer files, infact, it literally transmits frames from the desktop of the server.
I didn't show you any disrespect and I'm not interested in a flame war. Perhaps you should do some research into the actual technologies I'm talking about?