OpenGL Best Only for Small Images in CS5?

I've been using Photoshop CS5 daily from shortly after the day it was released on my Windows 7 x64 system. I have a decent dual processor dual core w/hyperthreading workstation with 8 GB of RAM and a VisionTek ATI Radeon HD 4670 video card with 1GB of onboard video RAM. Mostly I've been editing relatively small images (10 to 20 megapixels), though I've successfully made some pretty big panoramas.
Outside of a few glitches, most of which were solved with 12.0.1 (i.e., things like crashing or stuck processes after shutdown), I've had very good results with Photoshop CS5.
I tried the various OpenGL settings, and since the "Basic" setting seems to stress OpenGL the least while still providing me access to the new OpenGL features (e.g., brush gestures), I have chosen that setting. Keep in mind this decision was also influenced by the sheer number of OpenGL-related issues being reported here.
However, in the past day I have been working on a rather larger image... Not huge, as Large images go, but large enough that it has caused me some unexpected Photoshop trouble. Basically, it's a set of 7 digital camera images of 10 megapixels arranged in a 12 x 36 inch layout at 600 ppi. Overall image size is 21,600 x 7200 pixels x 16 bits/channel. The image on disk is roughly a gigabyte. Here's a small version so you can see what I'm talking about...
I had this image in 2 layers - the images with transparent surround and outer bevel layer style, and the background blue. The customer wanted the images spread out a bit more so I undertook to do so - by lassoing sets of the images and moving them apart.
Here's where the trouble began. Some of the work involved zooming in, to say 250% or closer, to check alignment and to nudge things as needed.
While working on this image I find Photoshop gets quite sluggish, though it's not hard on the disk drive.
After I moved everything into place and did File - Save, my system simply froze as the progress bar reached 1 pixel shy of a full bar. That required a hard reset of the computer. No events were logged in the Windows System or Application logs.
I redid the work, and second time I did File - Save As... the dialog never came up. Photoshop just disappeared. Again, no errors logged.
Today I ran through the edit again, this time with OpenGL turned off. I found:
1. The system was nowhere near as sluggish when displaying the image at high magnifications. I could move things around easier.
2. I was able to complete the same edits again (the 3rd time) and File - Save As... successfully.
Today I upgraded my ATI drivers to Catalyst 10.6, re-enabled OpenGL in Photoshop, and went through the same edits on the same file a 4th time.
1. Same sluggishness as before when zoomed in.
2. After moving the images around, when I went to use the Spot Healing Brush Photoshop crashed: Unhandled Exception, 0xC0000005: Access violation reading location 0x00000000007e8ebb0.
I don't have Photoshop debugging symbols, but this is what the Call Stack showed in the debugger:
I will continue to experiment with this to see if I can isolate what's causing it, but the one key thing here is that it works with OpenGL turned off, and it fails in several ways with OpenGL turned on with a powerful, relatively modern video card.
-Noel

Thanks for your responses.
I'm investigating the Normal and Advanced settings with this same image as time permits.
So far I've been able to complete the same edits and save the file successfully with OpenGL set to Normal. Notably as well Photoshop was VERY much more responsive.
It's a very small sample size, but one might be forgiven for concluding that Photoshop has had the most testing with the OpenGL setting at default. I do plan to continue testing with this image, as it seems to be a good one for stressing the system and reproducing one or more problems.
I may have been wrong in my judgment that the Basic OpenGL setting stresses the system less.
As far as why I'm working with a 16 bit image and at this high a resolution, I am specifically pushing Photoshop hard since with a 64 bit system these things should be possible, and I haven't gotten a lot of experience working on big images with 12.0.1. While this particular image does not require it (especially for a 12 x 36 print) I often DO work on 1 gigabyte or more astroimages, and I just haven't had a good big one to work on lately.
-Noel

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