Running Four Monitors with SLI Video Cards

I wonder if anybody is using this new type of video card to run four monitors for trading.
I look at the SLI specs and see that you can tie two dual-port cards together (Nvidia for example) to make four video outputs. They sit in two PCIe X16 slots, connected together by a short connector.

I consider this setup but the cost holds me back. I have to upgrade my motherboard to be SLI compartible, buy new memory and new CPU with new socket type.

I wonder if this setup is anywhere faster than using a Matrox PCI quad card to justify for the upgrade cost.

Any input is appreciated.
 
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