That is the correct advertised speed of 1600, however it will run at 2400 being overclocked with the XMP profile. I'm pretty sure it has something to do with leaving the voltage @ 1.5 volts for the memory controller.

For the seasoned veterans of Vegas what I'm looking for is the ideal allocation of RAM and just the overall proper settings to maximize the efficiency of the program.

I'm also running a 250 gb Samsung 850 Evo SSD, I have my OS and the Vegas program on this drive as well as other magnetic drives for storage.

My seasoned veterans statement was not a stab at you old smoke just days general statement...;)

Oldsmoke is right. The intel chipset is spec at 1600Mhz, anything beyond that is an overclock supported by the memory controller.

If your memory has an SPD for 2400Mhz non-XMP profile, then chances are you should be able to get a stable config. Run Memtest86+ through at least one full test sequence to determine if errors are being produced on the bus.

According to http://www.asrock.com/mb/Intel/Z97%20Extreme4/ your board has a memory controller capable of 3200Mhz SPD settings, this means you will need memory capable of this speed setting, and most likely matched timing DIMMs as well. More than likely the 3200Mhz OC is for 2 DIMMs and not 4.

Downloading a copy of Speccy will show you the current memory speed running, and details on what SPD the memory installed supports. You can also determine if all the memory modules are the same in terms of memory timings. All memory timings on the system should be the same for optimal speed.

Like the old rubber meets the road saying, running a "winsat mem" command from an admin command prompt will give you memory bandwidth. Do this test with the system idle and not still coming up from boot. Your memory should be inline or exceed the bandwidth recommended for the chipset.

I felt the knife! :-)

I would still not go beyond 1600MHz; all it does is stressing the memory controller for very little extra gain. If you have high spec RAM you are better off running it a lower speed with tighter timings. Trust me, been there, done that.

Well, a little background here now that I'm near a PC again. When I researched this build, I did some homework on the hardware and had intentions on upgrading my current 8GB 1600 Dominator to something larger if I could capitalize on the added bandwidth.

The 4790k while spec'd to 1600, is for a non-OC environment, but can utilize 2400 RAM.... it's just the question of can this be done while keeping the voltage at 1.5V.
Intel recommends keeping it at 1.5V, but many have used 1.65V with no issues.

I spoke with G-Skill and they said the 4790k will really utilize the 2400 RAM. The Haswell architecture specifically seems to really shine with 2133 or higher RAM with 2133 being the sweet spot.

I looked at CAS 9 2133 RAM and the 2400 CAS 10 slightly edged it out with the Trident-X, not so much with the Dominator as the timings were looser.

Hopefully everything boots up with the XMP profile...I will keep you posted and we can hopefully go from there. I do trust everyone here but I guess I need to be the guinea pig on this one...consensus does point to the fact it should work so I will definitely report back after I (hopefully) get it up and running...then we can sort the allocations.