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Not sure about the clock to clock difference between Nehalem EX and westmere EX; I'll bet it's minor. I don't think the Nehalem EX was offered in a 10 core package. Westmere EX are offered in 8 core and 10 core variants, notably, and emphasize core count and cache size over clock speed. They run...
I wish I could find the link to the build, but I have seen those flex risers used to connect 7 dual slot GPUs to a single ATX motherboard. Unfortunately, the ones I remember the build using were custom made. That said, it looks like the ones you posted would have a low enough clearance to fit.
Lian Li PC-V2120, PC80 I think. There's a Xigmatek full tower that will hold it. Most if not all of the Mountain Mods cases, some Case Labs cases will do it. There's a few others that either officially support it or support it with some caveats, but I can't recall what they are. The real problem...
Nothing to summarize, really. Jacob simply confirmed that it will happen and that they're already knee deep in the process. There's no pictures or specs yet, but it will be built to run on the E5-2600 quad, hex, and octo-core Xeons that should be hitting the streets between November and January...
Asus is playing their cards very close to the chest, but probably. As for the SR-3 (or whatever), the answer is a resounding yes: Check it out:
http://www.evga.com/forums/tm.aspx?high=&m=1130985&mpage=3#1132728
And per Jacob's twitter, it is "not intended for IB-E Xeons" so that says...