1866mhz memory. but mobo only recognizing 1333mhz?

What cpu are you using? If it is a FX series cpu it is rated for 1866Mhz for 1 dimms per channel, you will have to go into the BIOS and just up the muliplier/speed and possibly CL10. If it is a Phenom x4 or x6 you can get to 1600Mhz with 1dimms per channel without going past the cpu's rated limit by doing the same thing. Alot of motherboards set the ram at a lower setting because different kits of Ram have different timings and if they are set by the computer at default at a fast speed and wrong timings the system will not boot.

not sure, but this is a Newegg customer review...

I purchased This MB to run with the AMD FX 8150. I have built computers from high end to low end and know the ones in the middle last the longest and are the most stable. I don't know everything but this is far from my first build.
I RMA'D the first board and processor together because I knew on or the other was DOA. Newegg replaced the MB but sent the processor back with "physical damage". One pin, closest to the little arrow was bent. I know well that bending one pin perfectly and not the one next to it is something I did not do. But given the contract agreement, I sucked it up and bought another processor. Same make and model to put in the new board.

This time around I was able to load an OS. I was getting blue screens with different codes every 4 hrs or so. I took the processor out to examine and found the MB melted at the bores where the pins are of the processor are places and a cooked processor with broken pins toward the center. Board and Processor 2 out the window. I'm a carpenter and know that if the hole and pins don't match up perfect, or the clamp lever pinches onto the processor unevenly, then we have a problem.

Called Newegg. Newegg told me to get lost at first. Told me to contact AMD and Gigabyte. I did... They both told me basically that it wasn't they're problem and to go back to Newegg. I did. Newegg agreed to the second RMA.

New MB arrives. Put new processor in it. Computer runs fine till the blue screen about memory management. Work through to find out timing set to auto is not auto. Check and make sure "profile1" isn't your ram timing.

Today bios power management errors. Computer sleeping won't wake up. Fans and power on, no hard drive, no OS, no nothing until I removed the battery.

This has been the worst build of my life. I used to love building PC's and hated Apple. But after this, I want to take this thing out back, drop it in a fire and fill it with 12 gauge shot, and call it a loss. At this point the fun of the build is gone, and I have too many hours dealing with problems. Too much money spent and time wasted. I have an old LanParty NF4 board running Win 7 that is more stable and reliable than this garbage.
See ya later Gigabyte... Never again

Sounds like bad RAM - I didn't read before

When the system is failing to boot, its because the memory timings are too tight for your system.

Looking at the verified memory for your board, it has not been verified to work with any 8GB chips of any speed.

Below is a note in the memory support document about 1866 mhz memory.

"Note: Only one DIMM per channel is supported for DDR3-1866MHz and higher speed as using an AM3+ CPU."

http://download.gigabyte.us/FileList/Memory/memory_ga-990fxa-ud5.pdf

Try running your memory at 1800 MHZ, and see if that works, if not throttle down to 1600 MHZ and tighten the timing according to the memory specs. As you are not using an APU, having the memory run at these higher speeds has very low impact on overall system performance.

If you really must have 1866, you will have to (at a minimum) remove two DIMM's from your motherboard.

I've built many systems all with the same Core Components and sometimes I would have to set it manually from 1333 MHz.

See my above post..

"Note: Only one DIMM per channel is supported for DDR3-1866MHz and higher speed as using an AM3+ CPU."

http://download.gigabyte.us/FileList/Memory/memory_ga-9...

You would physically remove half of your ram from your computer, that is the only way to run at 1866

Agreed.

As far as I have seen dual channel doesn't make or break the deal and running at 1866 MHz on one stick may be faster.

I have looked up those options before and the speed of DDR3 is already through the roof that dual channel doesn't necessarily make things quicker more than a second if anything at all.

Anyone disagree or got something to add?

He is running 2 dimms per channel x two Channels and the cpu's memory controller can not handle running all that memory at 1866Mhz unless he messes with the memory controller voltage and the ram settings and even then it is the luck of the draw because it is past what AMD certifies the cpu for. Personally I would be happy with 1600Mhz and just run tighter timings if i was unable to tweak the cpu into working at 1866mhz. You gotta remember that 32GB is alot of ram and even just a few years ago you would have had to had ECC Registered memory to get that much into a system because of the load it puts on the memory controller.

When will they come out with 32 GB sticks?

64-bit ftw!

They already have them for servers. It is called ECC Registered memory...
http://www.slashgear.com/samsung-32gb-ddr3-ram-stick-revealed-1847404/

Don't try to get smart...

I was obviously talking about for a desktop.

No kidding they have them for servers.. Did you think Google is running a farm of 32GB nodes all over the place?

No one wants ECC RAM in their desktop at home which is what the original poster cares about.

I can't help that I am smart .. In high memory configurations ECC and Registered memory are essential to keep the data in the memory from becoming corrupted.. Anyways Kingston does sell non ecc or registered 16GB DDR3 1333Mhz modules. They are not cheap and are kinda slow but should work in a lot of normal systems. I would expect DDR4 to have 32GB modules in higher speed versions for non server(ecc, registered) platforms as the fabrication size of memory and chip stacking continues to progress.

Source of 16GB Ram Sticks: http://www.newegg.com/Product/Product.aspx?Item=N82E16820239525&IsVirtualParent=1

It's not that you post "smart" random ideas but they are things that are irrelevant,

Anyways, well like a poster said you can only run one stick at 1866 MHz. You can only have 8GB @ 1866 MHz.

16GB sticks don't seem to be up to par yet, although I didn't search online.

That is unfortunate but at the same time it is true that just 10 years ago the thought of more than 4 GB at home was a dream.

Do you build cloud infrastructure? Why do you assume you are "smart" in high memory configurations? Can you spec out a 500 GB RAM system to 200 users?