Don't know what model of monitor the Trinitron is, but the default scan rate at 1024x768 is 75Hz for most 17" Sony's. You can manully set them to 85hz, which is the secondary rate and they work just fine.
I really suspect you have hit the limit of your video card. You did not say how much memory your video card has.
As far as the difference between a "game" and "3d accelerator" card goes.... Some of the video companies have cards they call "game cards". These cards are usually stripped down to what the gamer needs (i.e. no analog connections for a video tape deck, no MPEG compression on board for DVD playback and so on).
They are all "3d accelerators". I don't know of any company still selling non-3d accelerated cards anymore. You would have to go back a couple of years to find non-3d graphics boards.
Now, as far as "bang for the buck" goes, the ATI Rage MAXX is about the best deal you can get, right now. At $105.00 U.S. it gives me a framerate from 45 to 80 at 1280x1024x32 bit. Now, my monitor does support 100Hz scan rates in this mode (19" NEC FP-950). Generally, the Sony 17" monitors will only run at 60Hz in this mode.
Also note, the MAXX (AGP bus required) requires 2 interrupts, which cannot be shared. Looking at your system configuration, you probably cannot use the MAXX, as you do not have enough free interrupts to use the drivers (it likes 10 & 11 for the interrupts).
There are other cards, which will give equal to better performance, but I think they are running about $240.00 U.S. right now, although I have heard rumblings of the prices of these cards are dropping.
I am sure others will drop in thier suggestions for these cards, as I have no real experience with them I cannot make any sure recommendations.
Hope this helps.
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Roy "Skuzzy" Neese
President, AppLink Corp.
http://www.applink.netskuzzy@applink.net