to further my comment, I went to one review site and here is what is mentioned
"Supports memory cards with capacity of up to 2GB and may complies with some non-SDHC cards with higher capacity than 2GB".
for more information on the x3i go to:
http://www.pdadb.net/index.php?m=specs&id=83
By the way, I just purchased my x3i off ebay. It was worth the $88.00.