I am planning to use one to clean my computers. Are they safe? I have one that has small tank attached to it. Slighly bigger size then a vaccum cleaner but is 20kg+.
The chart you provided did not provide results for GTX295 or even GTX260 SLi
Look here instead:
http://www.guru3d.com/article/geforce-gtx-295-preview/7
[If you look at ALL the games and compare, it shows that GTX295 is generally faster then 4870x2.]
and here...