Question 1

I have a Gigabyte mother board - ga-990F XA-UD3 is this ram compatable?

Accepted Answer

Yes this RAM will be perfect for your rig. I recommend this memory to anyone and everyone.

Question 2

I installed this some time back and never thought about it - I've had minor stability issues ever since, with no overclocking of any components.  Z87 MPOWER MAX m/b, and 32GB of this RAM.  For some reason this m/b only detects this RAM as 1333.  I had manually set it to the rated speed of 2133, but now I'm wondering if that was a mistake?

Accepted Answer

Your computer will only recognise 1333.  In your bios you should be able to configure the 2133 speed.  On my ASUS P9 Pro x79 and in the bios I had to go to the Ai Tweaker tab.  Under this tab I chose the Ai Overclock Tuner and switched it to X.M.P. (eXtreme Memory Profile) My profile #1 is X.M.P. DDR3-2133.
Once you've enabled X.M.P. then you can go to the Memory Frequency and select DDR3-2133MHz which will change the profile.  Bio's won't recognise the higher speeds because 2133 is actually an overclocked speed that these dimm's will operate at.  
I successfully use, without error's, 64 GB's of DDR3 at 2133MHz by CORSAIR for CPU intensive animation rendering and give these chips the highest possible rating.

Brand	CORSAIR
Series	Vengeance
Model	CMZ16GX3M2A2133C10

Capacity	16GB (2 x 8GB)
Speed	DDR3 2133 (PC3 17000)
CAS Latency	CL10
Timing	10-11-11-31
Voltage	1.50V
Multi-channel Kit	Dual Channel Kit
Color	Black
Heat Spreader	Yes
Features	16GB (2x8GB) DDR3 for AMD and Intel Dual Channel processors 10-11-11-31 latency Vengeance heat spreader for styling and performance Intel XMP 1.3 (Extreme Memory Profile) Support

CORSAIR Vengeance 16GB (2 x 8GB) DDR3 2133 (PC3 17000) Desktop Memory Model CMZ16GX3M2A2133C10

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Item#: N82E16820233332