Can i travel to US with amemndment acknoweledgement notice

I got my H1B stamped in March 2016 for X client and location and validity is till Oct2016. Now I got my project changed to Y ( Different location) and they have initiated amendment cum extension petition in premium mode. LCA is ready, waiting for petition submission.

Can i travel to US in Aug2016 or Sep 2016 once i receive acknowledgement notice or should i go for stamping after my current validity expires.

Please let me know.