Attention, owners of old Mac Pros. You can now, if you so desire, upgrade your graphics card to the Nvidia 8800GT for the reasonable price of $279. Apparently there was some sort of hullabaloo earlier this year because the previously released 8800GT only worked with just-released Mac Pro. Owners of older systems complained and complained, Steve Jobs apologized (sorta) and told them the upgrade was coming. And now it’s here.