Its a X2.
If you truly want that much Graphics power, It would be much cheaper to purchase 2 single HD 5870s and crossfire them.
Unless for some reason Crossfire is not an option.
Look at it like this
If my calculation is correct, that comes out to about $1300 USD.
2 Vapor-X 5870s in crossfire will cost about $680USD or 500EU
2 Toxic 5850s will run about $620USD or 454EU
Theres also the 5970s in ATIs offerings for a single card ... not to mention some of Nvidias higher end stuff that would be cheaper.
So, yea, I agree not worth it.