That's upto the (ASUS) MoBo manufacturer.
And that's one of the reasons why I'm holding out on a (current) 975X chipset MoBo. I have a feeling that ASUS may revise their 975X chipset or Intel may release a 975XE, just like they did back in the 925 chispet days. Remember?
Poncho, an Intel employee from another forum has a Conroe CPU on a 975X MoBo by Intel which has been reworked for Conroe specifically, because he claims that the 965 chipset that will "officially" support Conroe, is not or doesn't feel as good as a 975X, but then again I'm not sure if the 975X that may or may not be release for Conroe will have the ICH8-R south-bridge.
In any case, I'll be waiting for a 985 chipset but not before I get my hands on a 960.