Hi.i want to choose a good Video Card.but i have many chance.What's the more important parameter to select one

================more important==============

1-Memory Capacity

2-GPU

3-Memory Speed|||1. High memory capacity (512mb+) is only needed when playing at higher resolutions (1680x1050 & 1600x1200 or higher). Though, there are a few games that require 512mb+ to put the setting to Ultra High Quality (GRAW2 and UNREAL).

If you're gaming at 1024x768 or 1280x1024, 256-320mb models should suffice.



2. Generally, the newer the GPU design the better the performance for a given class of cards. For instance, the 8600gt is quicker in newer, shader intensive games than the 7600gt. The 8800-series Nvidia's absolutely trounce every other card out there.

If you want to game at 1080p resolutions (1920x1080) you must have a 8800gts 640, 8800gtx/ultra, or the 2900xt.



3. Memory and core speeds do play a part, but again, the newer (GPU) equivelent level card will always be faster. Also, low-end cards use a 128-bit memory interface, while mid-to-high use 256-bit or higher (this increases memory bandwidth) Many enthusiasts and even the manufactures overclock their cards (memory and core).



Here is an interactive video card chart:

http://www23.tomshardware.com/graphics_2…



The best card for the money in the US currently are:

$75 - 7600gt

$90 - 8600gt

$120 - x1950pro 256mb

$130 - x1950pro 512mb

$130 - 8600gts 256mb

$165 - x1950xt 256mb

$195 - x1950xt 512mb

$250 - 8800gts 320mb

$340 - 8800gts 640mb

...x2900xt

...8800gtx

...8800ultra (factory overclocked GTX).



All prices reflect mail-in-rebates.|||Well...



This is a tough question to answer. The answer is dependent upon what kind of game you will be playing.



Most of the time, the GPU is the most important factor.