Stitch high resolution images on Photoshop

Hello,

I would like to make a panorama with 465 photos of approximatively 420 KB each one.

Software like Autostitch and Hugin don't work. Best results are with Photoshop: it can stitch some images together, but not all, even if I try to make piece by piece. Photoshop generally finish by a "not reponding". And something strange, sometimes it can't finish panorama with less images than panorama it already did.

Maybe this is a lake of sace, but on the ram, on the disk ?.. or an other different problem?

Help I am lost! Anyone has an answer?