How to use more than two pci-e gpu on a mother with only two?

[induktor]

Hello

I want to expand my current build of 2 x 7850 cards, to 4x 7850

I use 7850 because, in my area, the 1GB version is very cheap, and is the best cost/power ratio here.

The thing is that my motherboard only has 2x PCI-E 16x, and 2x PCI-E 1x

can I connect two more cards to the 1x connectors with some sort of adaptor or the required bandwidth for the card doesn't allow it?

I will love to be able to connect 4 cards!.

I have read in one post that you have something called PCI-E extenders, what are they? where can I found them?

thank you
Indkt.