15 years ago
1.eVGA makes very good graphics cards!
2. GT is fast but lower bit processing. (125bit -256bit)
3. GTS is much faster and has much higher bit processing. (320bit)
4. GTX is very fast and has even higher bit processing. (384bit)
5. Ultra is the fastest as far as clock speeds with the same bit processing as GTX. (384bit)
The higher the memory bit processing, the more the graphics card can process faster. (smoother gameplay on higher graphics settings & resolutions)
As far as how good a card is, is what you are going to use it for...
In general, the faster the clock speeds & higher the memory bit processing, the better it will play games.