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Dell 390 Tower with 3 Video Cards having issue with getting vid cards to work in pcie x 1 ports... need help

We have a Dell 390 tower that has 1 pcie x16 port and 2 pcie x1 ports. We have 3 additional videos cards other then the onboard but we are having difficulty getting all the video cards to work. The mutiple option only comes up when you add the video card in pcie x 16 slot but will not come up if you remove that card and put video cards into the other slots. Need help getting all video cards to work at the same time.

Additional Video Cards ( all 3 besides onboard) are : 

 EVGA GeForce 8400 GS DirectX 10 01G-P3-1303-RX 1GB 64-Bit DDR3 PCI Express 2.0 x16 HDCP Ready Low Profile Ready Video Card

We have converter cables converting the pcie x 16 to pcie x 1. We've seen where other people with this same setup have gotten them all to work together but we just can't crack the code...any suggestions?

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