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I'm not going to go through a list for you, but I can tell that you don't have many options. The HP Compaq Business Desktop D530 uses a small form factor which means you don't have the same space as normal desktop users inside of your machine for the vast majority of display adapters. You would need at least a medium form factor for that. The other problem is that your power supply is only 185W and can't supply the the amount of power needed for most desktop class display adapters. The machine you are using wasn't designed to ever be used for gaming, and it shows. You would need to get a bigger computer case and higher watt (around 400 to 600 watt) power supply to support most desktop display adapters.
any standard wopeer supply will do, and you will need a more powerfyul power supply for a mre powerful graphics card.
you can get any pci-e card. an nvidia 9800gt used to be the 2nd best graphics, but its now the minimum card for gaming. I wqould reccomend a 9800, or at least an nvidia gtx260. the higher the numper, per series, and the 4xx and 5xx series are btter than the 2xx. be sure to check the graphics card for reccomended power supply rating.
for the ram, you need pc3200 DDR ram(DDR-400) or higher DDR ram, not compatible with ddr2 or ddr3.
The type of graphics card you need depends upon the programs you are using.
For example if you only use your computer for simple wprd processing, e-mails etc. then you only need a low end graphics card.
If you have a high performance computer and you play graphics intensive video games that renders realistic images, then you need a high end graphics card and these cards will have large video RAM (memory).
There are a large range of graphics cards on the market, I suggest you Google search for graphics cards that matches your programs and application requirements.
If your model computer has an AGP expansion slot, then make sure the graphics cards are AGP cards.
This particular model of the system is basic home use system not built for games.
You can put in either a PCI graphics card or an AGP 4x graphics card that should not take more than 1.5v of power.
The max you can put is 128 MB , you can try the 256 MB, but i would suggest against it .
The brand of RAM is not important, it's the type, you'll need SDRAM for that and an AGP4X type of graphics card... here's some several selections
SIS 315, 256-BIT AGP 4X VGA CARD
GREEN ATI 7000 SERIES CARD
Hope this helps... Just don't forget to rate - thanks.
Upgrading video cards will definitely increase in performance. You asked whether you should upgrade your entire PC or just the card and that really depends on the hardware you are running. If all of your hardware just barely meets the requirements than upgrading the videocard WILL give you a noticeable improvement but obviously it will not be as good as getting a better CPU and more RAM as well as a new card.
A good measure of a cards performance is based on the series of cards it is from. Your Geforce is from the 6000 series of Nvidia cards, they have 7000, 8000, and even 9000 series cards atm.
I would recommend something like an XFX Geforce 9800 GTX+ series card with 512MB of onboard memory, or any other competing card in the 200$ price range. This will definitely give you an increase in performance, and is a very popular card.
If you wish to upgrade your graphics card to a better one you will need to go out and purchase one. A good company is ATI they will have good gaming graphic cards. If you are still unsure about the graphics cards, or if this is not your problem you can e-mail me personaly at email@example.com
the pc you are using probably has onboard video and not a seperate dedicated AGP graphics card, which needs atleast 64MB of memory and T & L support, so check the card before you buy, if you already have an AGP card fitted it may not support T & L
I don't think there's a 8x AGP card made that would not work at 4x, and any 4x capable AGP slot should handle an 8x card.
AGP 1.0 (x2) signals at 3.3V
AGP 2.0 (x4) signals at 1.5V
AGP 3.0 (x8) signals at 0.8V