There's an Anti-stutter SLI chip?
they got rid of the old chip nvidia made themselves, NF200 bridge chip if im correct, the 590 had it to link the gpu's. They replaced with something new made by a third party.
this quote
"New to the dual GPU GTX 690 is the use of the PLX PCIe 3.0 bridge chip. Nvidia’s previous dual GPU card, the GTX 590 was still using the NF200 PCIe bridge chip designed by Nvidia’s own chipset division. Since Nvidia’s chipset division has been restructured and the NF200 chip was a PCIe 2.0 bridge, the company went to a 3rd party for a new PCIe 3.0 certified bridge"
from this article
http://news.softpedia.com/news/GeForce-GTX-690-Dual-GPU-Video-Card-Officially-Presented-266971.shtml
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