Actually, it likely will support any microSDXC card, including affordable 128GB microSDXC cards.  I've been using a 128GB microSDXC card in my Dell Venue 8 Pro tablet without any issue.

I believe it's the 5830--the Dell Venue 8 Pro--and it's the 32-bit.  My guess is, the 128GB capability will apply to all--it's the same SDXC capability as the 64GB microSDXC card. 

Just found the answer.

The Venue 11 Pro 32 bit 5130will support up to 64gb Micro SD,SDHC & SDXC cards 

Hi Mikerman, thanks for that.

Is your tablet the 5130 and the 64 bit or 32 bit version?