When EVGA X299 Dark show up everything about Intel i7 Skylake-X and Intel i9 will be clear.
Their powerconsumption looks like is far higher than Broadwell-E and I believe VRM on X299 Dark will be one of strongest ever build.
What customers want to get motherboard first day as ASUS X299 Deluxe and than to think did they make wrong decision or to wait little and read all news about X299 platform to see is it worth.
I always in such situation think "God please only not some issue with controler in CPU, some bugs with USB controller, some bugs with NVMe M.2... Such things show up in first 3-4 months or never. And that could happen every day, every moment we could recognize worse scenario.
For now everything is OK with X299 except 100W higher power consumption than i7-6950X after OC.
Is it worth difference between i7-6950X on 4.3GHz and i9-7900X on 4.3GHz customers know better than me.
I say worth upgrade from i7-5820K/i7-5930K/i7-6800K/i7-6850K to i7-7820X and i9-7900X or better.
i7-5960X and i7-6900K only on stronger models of i9, 12 cores +
i7-6950X same on i9 with 12 cores +
But upgrade i7-5960X to I7-7820X/i9-7900X maybe is not smartest move.
i7-5960X OC best of all models, that mean 4.5GHz it's soldered epoxy and 40 PCI-E lanes.
i7-7820X have 28 PCI-E lanes and thermal paste and in most cases OC max 300MHz over i7-5960X.
Same situation is with i9-7900X only PCI-E lanes are similar.
i7-5960X could become one of most wanter CPU next years when price drop. With performance improvement more than 30-35%, 8 cores and 40 PCI-E lanes he is very close to i7-7820X and X299. And I saw X99 motherboards ROG Strix and Rampage V Extreme available for less than 200$. That's total arround 500-550 on Ebay for Intel with 8 core and amazing satisfaction with OC.
Only watercooling is necessary, now with custom loop you can't nothing.
I could reach 4.5GHz with i7-5820K but I need to keep on 4.2-4.3 because AIO.
And improvements would be nice on 4.5GHz.