Will 6950k will support 3200mhz ddr4 ram ??

http://www.intel.com/content/www/us/en/gaming/extreme-memory-profile-xmp.html

Intel has developed a certification program for memory vendors to test their products for compatibility against Intel® Extreme Memory Profile (Intel® XMP). To view compatible memory DIMMs from a variety of vendors, download the datasheet in Excel* format, or view the PDF.

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Of course your MoBo must support that speed so easier to just check the MoBo Specs for an answer

Technically, Intel's CPUs only officially support up to 2133MT/s DDR4 and anything above that is overclocking with no guarantees from Intel. Most games and applications don't benefit much from memory faster than 2400MT/s either. Also, the JEDEC spec only goes up to 2400MT/s.

It will most likely work but there is no official standard or support for it.

It's true that the JEDEC standard doesn't get anywhere near the XMP limits, but that's far from saying that Intel., MoBo vendors or Memory vendors do not support XMP. While there is no inclusion of XMP in the JEDEC standard, it is an Intel Standard; Itel. MoBo makers and memory makes do provide "official" support for it.

http://www.anandtech.com/show/7364/memory-scaling-on-haswell/2

By default, memory should adhere to specifications set by JEDEC (formerly known as the Joint Electron Device Engineering Council)....

An XMP, or (Intel-developed) Extreme Memory Profile, is an additional set of values stored in the EEPROM which can be detected by SPD in the BIOS. Most DRAM has space for two additional SPD profiles, sometimes referred to as an ‘enthusiast’ and an ‘extreme’ profile; however most consumer oriented modules may only have one XMP profile. The XMP profile is typically the one advertised on the memory kit – if the capability of the memory deviates in any way from specified JEDEC timings, a manufacturer must use an XMP profile.

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Look on newegg and 99% of the sticks there are listed under their XMP profile rating.

As a memory vendor, good luck saying no to a consumer who made a purchase based upon a rating on the package / advertisements / web site and then saying that you can't "expect" to be able to run at that speed.

As a MoBo vendor, good luck saying no to a consumer who made a purchase based upon a rating on the package / advertisements / web site and then saying that you can't "expect" to be able to run at that speed.

As a CPU vendor, good luck saying no to a consumer who made a purchase based upon a listing on the "Intel Certified Compatibility List" / web site and then saying that you can't "expect" to be able to run at that speed.

Not being able to run at XMP is an acceptable reason for an RMA, tho I have done so only once. On an Asus build, after speaking to Mushkin and Intel, whao asked that I verify if RAM worked in a another system (It did), Asus TS approved an RMA but asked me 1st to try entering the XMP profile manually, instead of enabling XMP ... it work so we didn't do the RMA. Of course, vendors develop an income stream certifying memory vendors so if concerned, make sure RAM is on the QVL.

Its also oft posted that Intel doesn't support overclocking CPUs ... and yet they provide software enabling you to do just that ? As well as a complete protection plan that will replace your CPU even if you do something stoopid.
https://downloadcenter.intel.com/download/24075
http://click.intel.com/tuningplan/purchase-a-plan

Intel® XTU is a simple Windows*-based performance tuning software for novice and experienced enthusiasts to overclock, monitor, and stress a system. The software interface exposes a set of robust capabilities common in most enthusiast platforms along with special new features available on new Intel® processors and Intel® motherboards.

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As for XMP ..

http://www.intel.com/content/www/us/en/gaming/extreme-memory-profile-xmp.html

Predefined and tested Intel® XMP profiles can be loaded via BIOS or a specific tuning application through a computer’s operating system. Often the easiest way to load Intel® XMP profiles is using a tuning utility, which may be available depending on the particular board manufacturer. To learn whether a tuning utility is available on your system, you should contact the board manufacturer.

Intel has developed a certification program for memory vendors to test their products for compatibility against Intel® Extreme Memory Profile (Intel® XMP). To view compatible memory DIMMs from a variety of vendors, download the datasheet in Excel* format, or view the PDF.

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You can call Intel, MoBo Vendor and Memory manufacturer for "tech support" and each will provide that support to help you if you have difficulties using XMP profiles.

Been building PCs for ourselves and others for almost 25 years and using XMP for almost 10 years now and other than the one instance above, never had a hitch enabling XMP profiles ... and we never even look at at MoBo QVLs.

XMP is nothing more than an alternative to SPD which provides more detailed timing specs to give the BIOS more accurate data to calculate timings from, it changes absolutely nothing to the fact that the official DDR4 spec currently ends at 2400MT, XMP or otherwise.

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+1 Too many people that XMP is magic and it's just going to work - they obviously don't know systems. Same with those that look and see a mobo supports say 3600 so they just take it that they can run 3600 with anything. The defining factor as to if you can run a given data rate is the MC (memory controller) in your CPU, and if you know how to combine it with fast data rate DRAM. In many cases a 6950X can handle 3200 while at stock, though then again, many will need a slight OC of the CPU to help out the MC and run 3200. You may also need to adjust the MC voltage to get the 3200 to run.

There is also quality of the signal routing and PCB from the CPU socket to the DIMM slots, quality of the socket and DIMM slots themselves, quality of the routing and PCB of the DIMMs, quality of the chips on those DIMMs and likely a few more physical factors.

There are too many variables spanning too many different parties for official standards to push aggressive clock frequencies.

Very true, generally though if you stick with a good quality mobo in the mid to upper levels ( I stick with Asus, the Rock and GB) running the higher end DRAM is doable. Up through about 3466 it's pretty OK, 3600 and up it can start to get tricky, that seems to be more the area where the amount of DRAM really starts playing into the equation, as well as the System Agent Voltage, and ...., and....