max SD card size in IPAQ rx3715/rx3417 PDA?

I've looked in all my manuals, all over the Ipaq/hp site. I've even asked HP and they didn't reply... So can anyone here help me? I just want to know how big of an SD card I can put in my rx3417 (just has less ram then the rx3715 model.)

So can anyone help me? I really want to put a 4gig card in or maybe even an 8gig..