Doesn't tri or quad sli on Z series require an uber expensive PLX board, ie usually £250.00+. And there's a certain amount of latency when running ski in this way as compared to native pcie lanes. Only used dual card sli on X58 and Z77/87 lately.
Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.