Workstation Card for PS CS5?

Here is a card that was designed for CS4 the Quadro CX

http://www.nvidia.com/object/product_quadro_cx_us.html

Here is a review on it.

http://www.pcper.com/article.php?aid=649

quadro 4xxx and 5xxx series. but all depending on your budget.

naturally the 5xxx series and the cx but the 5xxx series is being integrated with adobe and nvidia to work together for cs5.

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NVIDIA Quadro and GeForce GPUs are designed
to boost performance of Adobe Creative Suite 5.

The following solutions are certified by Adobe
for use with Premiere Pro CS5:

> Quadro 5000*
> Quadro 4000*
> Quadro 5000M*
> Quadro FX 5800
> Quadro FX 4800
> Quadro FX 4800 Mac
> Quadro FX 3800
> GeForce GTX 285

For photoshop there is no major benefit to having a workstation card, the latest gaming cards will do better OpenGL accelration than the older workstation cards, the only benefit is if he has an appropriate monitor to support high bit-depth (true bit depth not look-up tables) which is the only advantage of those cards if you're not doing serious pro 3D work.

The only area where there is a dramatic difference for having Quadro or GTX cards would be for serious video editing where the Mercury Playback Engine uses CUDA for 1 of 3 features, everything else is OpenGL accelerated, and will work on any solid card with good amount of VRAM.

For your dad using Photoshop there's not going to be any difference in using a Geforce GTS250 or HD5770 versus a Quadro or FirePro/GL card. The only difference is what people may artificially lock their plug-ins to, but that can easily be bypassed.

The guys above simply cut/pasted Google info   , you'd be far better off actually going to the Adobe forums to get input from more people using CS5, they can also show you how to get the most of whichever hardware you end up getting, but your dad would be much better off getting the best CPU, memory, HDD/SDD combo he can than wasting his money on a workstation card.

Photoshop doesn't benefit as much as 3D programs such as Maya, 3DSMax, or CAD programs like CATIA or SolidWorks.

However, it does get acceleration from the graphics board and Geforce and Radeon is supported:
http://kb2.adobe.com/cps/831/cpsid_83117.html
http://forums.adobe.com/thread/605380

Also, you might want to refer to an older thread: http://www.tomshardware.com/forum/287926-33-nvidia-quad...
(This was before the Firepro x8xx series really took off though.)