.. okay I apologize for my lack of knowledge on this subject.  College was a looooooong time ago and PCI-E didn't exist so I'm slowly catching up.

My hardware..

motherboard is an ASRock 970 Extreme4
three 7970 video cards

My issue..

I need to order risers as my three 7970 video cards have a slight heating issue (when mining, they run at these temperatures 68, 90-95, and 82.... and this is with a small fan on top and an 18" blowing directly on it).  There is a decent space between vid 1 and 2 (thus 68 degrees), but almost no space between 2 and 3 (thus 90-95 degrees celcius).

My question...

My motherboard has two small pci-e slots and three full size (16) slots.  Does this mean I can put 5 video cards on my system by purchasing two 1x to 16x risers and three 16x to 16x risers?

Many thanks for answers