Photoshop :: CS4 - GPU, OpenGL, Radeon, Dual Monitor...

I installed CS4 on my Windows XP system. I immediately updated all the components to the latest versions. When I tried to run CS4, I got repeated error messages about GPU problems. When I tried to open Preferences, CS4 crashed, but only on the General and Performance tabs. I called tech support and they suggested getting the latest drivers for my video card. I did that (for one of my two video cards) and now I can run CS4, but no OpenGL.

Here's my system:

Antec P182 case

PC Power & Cooling S61EPS 610W Power Supply

ASUS P5E motherboard

Intel Q9450 2.66 Ghz CPU

Zalman 9700 CPU cooler

Mushkin 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) RAM

Visiontek Radeon HD3850 512M video card (primary) PCIe

Sapphire Radeon 9250 256M video card (secondary) PCI

HP LP2065 monitors (2)

Western Digital WD6400AAKS 640GB hard drives (3)

Samsung SH-S223F DVD burner

Windows XP Home

I was able to update the video driver for the Radeon 3850 card, but there is nothing new for the Radeon 9250 card. With the newer Radeon 3850 driver, I can now run CS4, but in Preferences > Performance, the GPU setting is now grayed out for Enable OpenGL Drawing and it says "No GPU options available with Photoshop Standard."

When I remove the Radeon 9250 card and just use the Radeon 3850 card, the Enable OpenGL option is there and CS4 runs with it enabled. I conclude from this that the Radeon 9250 card and its driver don't support what CS4 needs, but the Radeon 3850 card and driver do.

I use two video cards because I use Colorvision Spyder3 Elite to calibrate and profile my two monitors, and it is my understanding that I need two cards to separately profile each monitor.

Questions:

1) What features in CS4 am I missing by running it with OpenGL Drawing disabled? CS4 seems to work similarly to CS3 when I edit an image, so maybe I don't need OpenGL... just wondering what OpenGL would give me.

2) Can someone recommend a video card that will run CS4 with OpenGL ... AND ... that will allow dual monitors to each be profiled separately? Or, perhaps I can simply replace the Radeon 9250 PCI card with a newer card that supports OpenGL. Suggestions?

3) I do not have the latest BIOS for my motherboard. Would updating the BIOS help with the OpenGL issue, or is this just a video card/driver issue? My system runs perfectly so I hesitate to update the BIOS -- if it ain't broke, don't fix it.