Huw,
A few points:
1) What graphics card do you have at present? It may well offer you some
improvement when used in conjunction with the D3D patch you mention
2) The D3D patch allows GPL to make use of the 3D accelerated functions on
cards that support the D3D API.
<simplified mode>
There are a number of different "languages" that programs can use to "talk"
to 3D cards - and most graphics cards understand at least one of these. The
most used include D3D, OpenGL and Glide (3dfx)
Out-of-the-box, GPL only "talks" Glide and Rendition. That means that only
a card with 3dfx or rendition chips on it will "understand" the 3d graphics.
The most popular two graphics "languages" are now OpenGl and D3D. The
unsupported OpenGL and D3D patches released for GPL allow it to speak these
"languages", thus allowing accelerated 3D graphics on most graphics cards.
Because Glide and the Rendition language were closely linked with particular
hardware - they generally offered better performance (fps) on the same
hardware than the same game running under D3D or Glide, which brings us on
to 3)
3) An AMD K6-450 is not exactly cutting edge - and GPL can be very
demanding. You will probably be best trying to find a card based on a 3dfx
chipset (a Voodoo card), as this will help maximise framerate.
If you want to keep your current card, try and find a "Voodoo 2" card. This
is a standalone 3D card that fits in a full length PCI slot and works in
conjunction with your current card. You'll only be able to get them
second-hand, and it should cost you somewhere around 25.
You could also replace your current card with a Voodoo 3, 4 or 5. These
offer increasing performance and resolution, with the voodoo5 in particular
offering excellent image quality thanks to its Full-Screen-Anti-Aliasing
features (FSAA) that smooth out the "jaggy" lines where one colour meets
another on the computer screen. These cards all come in PCI or AGP formats.
Again , due to the demsise of 3dfx, you'll probably have to look for these
second-hand.
4) All the above advice in 3) is relevant only for GPL. 3dfx cards are now
a technology dead-end, and will get no more support. There are already
games being released that do not - and will not - run on Voodoo 2 and Voodoo
3 cards. However - your AMD 450 is not exactly cutting edge either - and
spending a lot of money on a graphics card for this machine is not
particularly sensible - IMHO. Another downside of the Voodoo 2/3 cards is
that they will not run some of the latest community-developed add-on tracks
as well as other cards - but again - your processor will probably be as much
of a limit here.
5) If you do want a new graphics card that you can later transfer to a more
powerful machine, for your budget consider the GeForce2 MX range of cards.
These will work with the D3D patch on GPL, but will not offer as good a
framerate as a Voodoo card.
You'll be able to buy these new for less than 100.
Hope this helps......
Ian