Despite what "experts" have written,
I have built the entire system, as above, and my conclusion is:
The 5870 video quality is superior, compared to the cheaper cards.
And I actually DID buy TWO cards, The cheap one, as recommended by "experts" and the expensive one, 5870. The 5870 blows the cheapo card away, both in video quality, and range of adjustments. It is MOST noticeable with streaming video programs.
Still photos?...About the same for both cards.
DVD playback? a bit better with the 5870. Cleaner picture for sure.
Streaming video? The 5870 is far, far superior.
Also the 5870 idles at 23 watts, making it run cooler than previous battleship video cards. The fan being adjustable speed, was no problem to set it into a quiet operational mode.
I will stick with the good card, and at $375, it was worth it-for the noticeable improvement in video quality.
I don't care what your "experts" have written. I can see the difference with my own two eyes.
I will also stick with my quad core processor. The quad core goes 50% during video playback, which would make a dual core go 100%. And that's what I don't want! The second a processor goes 100%...is when you loose your video quality.
I need cache memory to spare, that never goes 100%! Quads rule for home theater. The difference in price being so small between dual and quad, why bother with a dual core?
You can read reviews all day long, written by "experts"....but try actually building it, and compare the quality side by side. I DID!
You get what you pay for.