The nForce 590 SLI Intel Edition was supposed to launch this summer, but Nvidia pushed back the launch date several times at the eleventh hour before asking reviewers not to publish articles about the Nvidia reference board at all and going quiet about when the next launch date might be. Apparently tired of waiting, some sites went ahead and published reviews of the Nvidia reference design. Meanwhile, the wait for retail motherboards based on the nForce 590 SLI Intel Edition continues to this day.
Nvidia eventually stopped answering our emails regarding the status of the nForce 590 SLI for Intel platforms, so we checked with a few motherboard manufacturers. Those queries have been met with an effective "no comment," or have not been answered at all.
Now, rumor has it that Nvidia's motherboard partners aren't happy with the C19 component of the nForce 590 SLI chipset for Intel platforms, and that a replacement is coming in October. That seems like a plausible explanation for the extended product delays, although it suggests that enthusiasts looking to pair the nForce 590 SLI with a Core 2 processor still have a while to wait.