The OCZ Technology SLI-Ready 2GB DDR3-2000 dual channel memory kit is almost ahead of its time. The eVGA 790i motherboard does support SLI-Ready memory up to 2000MHz, but it did have some trouble staying stable at that speed. Testing really didn't show much advantage over a ‘slower’ kit, and if you can run with tighter timings at lower speeds you may be better off.
http://www.bigbruin.com/2008/oczsli2000_1