PCI Card slot too short?

Samlikesham

Honorable
Oct 27, 2013
198
0
10,690
Hey guys! im about to buy this card for my dell dimension 3000: http://www.ebay.com/itm/ZOTAC-ZT-60604-10L-GeForce-GT-610-512MB-64-bit-DDR3-PCI-VIDEO-CARD-/191049613101?pt=PCC_Video_TV_Cards&hash=item2c7b71bf2d.(its for my little bro to play minecraft) But the connector has 3 parts. My PCI card bus only has two parts like this:http://www.txcesssurplus.com/servlet/the-7056/Dell-Dimension-3000-Motherboard,/Detail Will it be okay to leave the one side hang off? or do i need that? I know this is a n00b question. Thanks ahead of time!