Only from authorized dealer … got it.
 
Here for $469 (get 10% credit for use later?)
 
Who is an authorized dealer? 
How do I check?
Newegg? Microcenter  Amazon Prime?
 
Also if buy from someone other than EVGA can I get am EVGA extended warranty?

EVGA sells it on their website.

I found it on the EVGA website a few months ago for $200

List of Authorized Companies  --->  Where To Buy
 
Official EVGA eBay Store - EVGA | eBay Stores
 
On EVGA.com -----> Save 5% Instantly on MB --> When you use Anyone's Associate Code  (sorry North America Only) 
 
 
 

Educate yourself - watch Buildzoids video on memory
 

Has anyone tried this in an EVGA X299 Dark?
https://www.newegg.com/ballistix-64gb-288-pin-ddr4-sdram/p/0ZK-0070-00015
I have this from another build...

3600MHz could be too high frequency for X299 and demand higher latency.
Maybe is best 3200MHz 14-14-14 1T. 
 
GSkill have kit with similar specifications. 
Maybe and others.

brazil
F4-3200C14Q-64GFX 
 
3200 CL14 and QVL for Evga X299 Dark (Skylake-X)
 

That's pretty old and probably expensive kit. 
Sometimes 64GB kit cost more then two 32GB.
If someone plan to use computer for gaming should pay max 250-300$ for memory.
There is a newer 32GB kits B-Die Samsung 3200MHz 4x8GB with RGB or without RGB for not so big money.
 
F4-3200C14Q-64GVK is probably good, but in Europe cost 520 euro it's QVL.
That's Ripjaws V launched later.
Not worth to pay so much for memory. 
 
GSkill Trident Z RGB F4-3200C16Q-32GTZR 32GB cost 200 euro but with higher latency.
If you can't find QVL then best option is similar kit. If QVL is 64GB, you buy same numbers only 32GB even if no on list of compatible.
 
14-14-14 3200MHz is some ideal spot for X299.
For some people that's expensive, and they could look for C15-C16, maybe OC success. decreasing timmings.
CORSAIR have nice Dominator Platinum RGB, I hear Samsung B-Die modules. You can disable RGB if you want.
But' it's shame that you can buy 64GB 14-14-14 Ripjaws V for 32GB Dominator Platinum RGB. Actually Dominator cost more.
[font="'helvetica neue', arial, helvetica, sans-serif; font-size: 26px"] 
Imagine in one computer EVGA X299 Dark, KINGPIN, Lian Li case, Heatkiller watercooling parts, Filco or WASD or Deck keyboards, Dominator memory and in other Strix motherboard, some GIGABYTE RGB GPU, Shine case with a lot of fans, AIO system, CM or Thermaltake case... 2/3 of people will choose worse option because 50$ total value of RGB inside. I give you warranty.
 
 
 
 

Don't that beat all .
I called the EVGA tech support for the best speed ram for my X299 Dark and they suggested 2666MHz ram.
So I bought the Corsair Vengeance RGB Pro, specs are:
DDR4 64GB(4x16) 2666MHz 16-18-18-35.

Ah well.....