Just ordered all of the components for my new rig with 6870's. Hoping to get her running after the weekend.

Beat me to it.

It could help reduce power consumption since the streaming cores are simply crunching numbers and the card is not actually holding the data that it crunches, simply passing it through the cache.

Could you give a little more detail about the hardware configuration that surrounds your dual 5870 setup? Do both of your rigs share common hardware?