Videocard performance primer: the most important features on a videocard
1. GPU (the architecture, # of pipelines, etc) - MOST IMPORTANT
2. Memory Interface (64, 128, or 256-bit)
3. Clockspeeds
4. AMOUNT of RAM (Least important, assuming you have the minimum spec for the game*)
To clarify... all the factors above are relevant to videocard performance, but this is the general heiarchy.
GPU architecture is the most important. How many pipelines the card has and how it uses them, which advanced affects the processor can handle.
Second most important is the memory interface. This relates to how FAST the memory is accessed, which in most cases is much more important than now MUCH memory there is. A 64-bit memory bus is only half as fast as a 128-bit memory bus, and a 256-bit memory bus is twice as fast as that.
Be wary of cards like that have the "SE" or "LE" designation... in most cases, it means their memory bus is half of what the non-SE versions are, and this has a large impact on performance
Third most important is clockspeeds. Higher clockspeeds on both the GPU and RAM mean higher performance. But remember, 400 Mhz memory on a 64-bit bus is the same speed as 200 Mhz memory on a 128-bit bus.
Least important is the AMOUNT of RAM. Developers create games for the lowest common denominator, and that means they are still making 64-meg texture sets for games. But the newest games are starting to make use of 128-megs of RAM, so 128-megs is the minimum. A few games will show a slight performance increase with 256-megs of RAM, but these number less than 5 I can think of.
256-Megs of RAM is, in most cases, a marketing tool for uneducated people to make a buying decision on. But trust me, you'd rather have a 64-meg Geforce4 Ti4200 than a 256-meg Radeon 9600SE.
WITH THIS IN MIND, to answer your questions:
1. SE cards usually have disabled pipelines (very bad) or much slower clockspeeds (bad, but not as bad if you're willing to overclock). PROs are usually midrange cards, good performmers but not the best... in the case of the X800 PROs, they have less pipelines than the X800XTs, but they have high clockspeeds and are still pretty good. XT's denote the top of the line, most pipelines, highest clockspeeds, and biggest memory interface.
2. No, not really. See explanation above.
3. Companies do whatever they want. Some charge more based on their brand, or they include a bigger bundle, or maybe the card has a VIVO feature.
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<b>Radeon <font color=red>9700 PRO</b></font color=red> <i>(o/c 332/345)</i>
<b>AthlonXP <font color=red>3200+</b></font color=red> <i>(Barton 2500+ o/c 400 FSB)</i>
<b>3dMark03: <font color=red>5,354</b>