AGP 4650 Catalyst/Overclock Problem

Hello again everyone,

After RMAing the last video card (Sapphire 3850 AGP), I've just gotten a Gigabyte 4650 AGP for my H.P. Workstation (XW6000).
My new card:

http://www.newegg.com/Product/Prod [...] agp%204650

The drivers loaded alright from Gigabyte's web site, but I noticed that trying to download any updated software from ATI resulted in complete lockups after windows retsarted.
I resorted to installing only the driver form Gigabyte and I was uble to play Unreal Tournament 3 at about 30FPS using Fraps.
Oddly, the old EVga 7600GT (512MB) card wirked much better, especially when overclocked a bit using EVga's Precision Tool.
I then tried the CCC to overclock and it simply will not allow for it at all-- no options for overdirve are available. I then tried updating my drivers through ATI, and it said that my device was not supported for any driver. Rivatuner also provides nothing but "low level" options-- nothing with a slider to provide performace options. I've tried clicking power used, but to no effect.
This all could be that it's a new card, but the overclock tool provided by Gigabyte completely locks up Windows when trying to open it at all.
Also, ATI Tools does the same thing as the Gigabyte utility.
Oddly, there doesn't seem to be a need for the AGP "Hotfix" with the new gigabyte drivers. The Hotfix drivers which other have used for other ATI cards would not install at all, since it said there was no supported device found.
Here's my old thread for system specs:

http://www.tomshardware.com/forum/ [...] orkstation


Now the issue is this-- although the cards works at a minimal level, shouldn't it provide a much, much bigger perfomance boost than simply matching a 3 year old card?
And although now Windows isn't providing any error messages, what can be done?
I've tried uninstalling and reinstalling using Driver Sweeper, and the result are the same.
My level of tech savvy is fairly low, so any help is appreciated!

Thanks for your help in advance,
Ben