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800 in sli ?

You can NOT compare the efficiency of the different multi GPU scaling abilities using those benchmarks (or most benchmarks I've seen to date) the baseline performance is too disparate between the 2 cards and we have no way of quantifying what is holding the 8800GTX back, but the fact that in most cases its getting the higher overall performance and in many cases substantially higher performance we can infer that the limitation is not the multi GPU scaling ability.

In the benchmarks you linked to the 8800GTS 640Mb in SLI would have given far better idea as to how well SLI performs compared to crossfire as its single card performance is much closer to the 2900 in most cases and would have given a good indication against the GTX scores as to if the results were CPU limited or not.
 
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Well clearly if card x is outperforming card y, but card y's dual card solution outperforms card x's dual card solution then y's dual card solution must be more effective?
 
If that were the case - but look at the benchmarks - in most cases the GTX massively outperforms the 2900 in the few situations where that isn't the case the card doesn't seem to perform too well with the game (oblivion being the case in point) anyway...

But if you look at the score for oblivion on this page...

http://it-review.net/index.php?option=com_content&task=view&id=1337&Itemid=91&limit=1&limitstart=3

it completely turns the scores here:

http://it-review.net/index.php?option=com_content&task=view&id=1337&Itemid=91&limit=1&limitstart=1

on its head...
 
Theres only one benchmark in 20+ shown there where the GTX SLI score is obviously not CPU limited and crossfire shows bigger gains... which means that its possible the score is an anomaly or a unique situation where SLI doesn't perform well even given the headroom to do so.
 
I'm not arguing the case one way or the other - to be honest, I couldn't care less which one is better. I'm just point out that Crossfire - using that set of benchmarks - appears to perform better.

I don't quite see why it's necessary to compare a GTS against the 2900XT, either, because either benefits arise or they don't.

The problem with ascertaining the contribution of the CPU to such benchmarks is comparability: this is one of the few side-by-side reviews of CrossFire/SLI that I could find without concerted searching and it doesn't really allow detailed analysis due to the high resolution and levels of IQ applied. If you want to find something that demonstrates the impact of the CPU, then I'd be very happy to see the results.
 
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