Well the score you posted was for the free version of GeekBench which only does 32-bit not 64-bit tests.
That and Atom uses a different microarch from Core, so there is that as well...
32/64 Windows benchmark is usually a difference of less than 2%.
The performance of the Atom x7 will be equivalent to my 2009 mac mini per core (I believe a core 2 duo) but have a couple more cores (4 in total). So the application speed will be the same, but allow for more processes. If you add in 4GB to prevent OS paging to SSD etc, it would be better. And of course if there is a full speed SSD (not confident they will do that - maybe a slightly slower one) the performance will probably be ok for basic stuff.... I am concerned about skimping on memory though.