Don't know exactly if 1237 is an official but unreleased bios from asus ou a hacked one. Obviously I didn't got it from asus, but it works fine for me without activating memory remapping. I had a KO with 1236 with 4 x OCZ 1 GB 6400 platinum and 2 x Crucial 2GB 6400 Ballistix Tracer. Saw in forums that I wasn't the only one. Maybe I will try again.