need help on selecting graphics card

If you read the graphics card section of this forum, I expect you'll find some pointers, though to be honest, you're not going to find anything that'll set your system alight if it only offers a 4x AGP port...

What games do you want to play with your machine, what's your CPU, and how much RAM do you have?

8x AGP cards will work fine with 4xAGP.

Indeed it will. But as I said... it ain't gonna be setting his system on fire with blazing fast throughput and silky smooth DX10 visuals...

Your choices are really limited for agp upgrades.

Best bet would be either a 7600gt($185) or a 7800gs($235)

What you should really do is save your money and upgrade your whole system.

7800 GS = yuck

7600 GT is good, but the GS is about the same speed for more money.

If you're spending around $240, get an X1950 PRO... fastest AGP card out there, and it'll shame both the 7600 GT and 7800 GS.

Check your power supply. It may be the limiting factor as to which AGP card will operate within the constrants of your PSU. As has been mentioned, the 7600GT is typically the best choice in terms of power efficiency, and it's also a solid performer.

Hope this helps. Enjoy!  

I seriously doubt he'd notice the difference between 4x and 8x. And DX10, well there aren't any DX10 AGP cards, and there most likely won't be.