Multiboxing is not always limited by CPU and RAM - by making a sweeping generalization like this, you're just creating your own misconceptions. I'm not saying a graphics card upgrade is a magic bullet either, but most of the time there will be a combination of factors that will improve performance.
Sure you can 5 box with that $130 video card with all the settings turned down, just like you can drive around town in a shit-box Hyundai - doesn't mean you want to though. Some of us like the eye candy, it makes for a enjoyable playing experience - and there is absolutely nothing wrong with that.
We're not measuring performance in calc, rendering video, or F@H - we're talking about performance in WoW. The idea behind using tools like GPU-Z and CPU-Z, is to establish a scale of performance relative to WoW itself.
For example, previously on my system I was running dual HD 5780's. If I parked my group on Orgrimmar, turned all the settings down to their minimum on my main, I got about 80% GPU usage on average and 40 FPS. Dialing the settings up to 'fair' and I saw about 90-100% usage with a drop in FPS down to 20-30. Moving the settings up to 'good' and I saw a constant 100% usage, along with a big drop in FPS to about 10-15 . At the same time if I looked at my CPU and RAM usage, and saw that neither were maxed out, then its logical to assume that the video card had become the limiting factor at these settings.
Sure enough when I upgraded to the GTX 580's I saw a big jump in FPS - I can now run my main at 'Ultra' settings with shadows at 'good' and still get around 30 FPS in Org. To be fair, my system setup is probably a bit different to most (more on this in another post) - but my point is these tools are perfectly valid to use as point of comparison for performance within WoW.
Cheers,
S.
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