Memory for Gigabyte GA-990XA-UD3

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Erithlor

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Oct 14, 2011
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So, I'm planning to make a RAM upgrade in next 1-2 months. Here are my specs:

AMD FX-8350 X8 4.0GHz
Corsair 2x4GB DDR3 1333MHz CL9 1.6V (8GB RAM)
MSI GeForce GTX760 2GB OC
OCZ Vertex 4 64GB and OCZ Vertex 4 128GB SSD
Corsair PSU TXV2 650W
Zalman CNPS10X Performa CPU cooler
Antec Two Hundred v2 case

My old video card was GTX560 Ti, which I upgraded last november and my old CPU was AMD Phenom x4 955 3.2GHz which I upgraded few days ago. I also replaced my HDD to SSD back in 2012. Now I want to get memory with better MHz to get as much as possible from my system. The ones I want to get is Corsair Vengeance Black 16GB (2x8GB) 1866MHz CL9 1.5V (CMZ16GX3M2A1866C9). Now my questions:

1. Will it fit? I have big Zalman CNPS10X Performa CPU cooler.
2. My both CPU and MB officially supports up to 1866Mhz, so these new RAMs should work well, right? Is that true, that this only apply if you have one RAM module while if you have 2 modules, you need to reduce it's speed?
3. Why so many people report issues with GA-990XA-UD3 and Corsair Vengeance RAM?
http://forum.corsair.com/forums/showthread.php?t=104615
http://www.tomshardware.co.uk/forum/328272-30-gigabyte-990fxa-crashing-1866mhz
http://forum.giga-byte.co.uk/index.php?topic=9559.0
4. 1.5V RAM is better than 1.65V RAM, right?
5. CL9 is better than CL10 and CL10 is better than CL11? :)




 
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With your combo of mobo and CPU would suggest 2x4GB or 2x8GB , 1.5 models, depending on how much you want/need of 1600 or 1866 with a CL of 9 - might want to look at the GSkill Snipers or Ripjaws X models, they have been the best I've worked with on AMD rigs
 
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There is no GSkill Snipers or Ripjaws X in my country. There are, however, some other good brands like Corsair, Kingston and others. I've wouldn't risk to order RAMs from other country because of the warranty, nobody would take them back if they are bad.

And what do you mean by "on how much you want/need of 1600 or 1866"? When I put new RAM in motherboard, they will be 1866 already or do I need to do that manually in BIOS? My BIOS is updated with latest F13 update. Does my MB support 8GB modules or 4GB is the biggest ones which supported?
 
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Have no idea of what you are looking for - when you said you want to upgrade the DRAM am guessing to 1600 or 1866 (faster, an 1866 is the high end for your CPU, and yes your mobo supports 8GB sticks, if GSkill not available would look at Mushkin or Corsair, and no haven't seen any problems with Corsair DRAM and your mobo if stickeing with good sticks - at 1600 or 1866 look for 1.5 sticks, don't get the 1.65 sticks, that's indicative of weak ICs (memory chips)
 
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Ok, I've put my new memory into PC. I have two issues. Well, it's more questions than issues.

1. It's a Corsair Vengeance 2x8GB 1866MHz RAM, but my computer shows 12GB (7,98B usable). Why? What's wrong?
2. I checked BIOS and found that these RAM working on 1333 RAM speed. I tried to manually set RAM speed to 9.33 (1866 Mhz), but then I getting boot failure. Setting to 1600Mhz doesn't work too, same boot failure. On 1333Mhz works fine. According to both my motherhboard and CPU websites, my PC SHOULD support 16GB (32GB supported by MB) on 1866Mhz speed.
 
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Sorry for 2nd post. 1st issue seems to be fixed. I purchased 3rd SSD drive for my computer along the RAM, I connected the SSD but havn't assigned the letter. So, I assigned letter, restarted PC and now all 16GB are shown normally. Also, 16GB now used on that new SSD (other 2 ssd drives have little free space left). What my RAM doing with SSD space?

So, what to do about 2nd question?

I found that DRAM E.O.C.P is set to disabled in BIOS. Would setting it to Profile1 help? Is it safe?
 
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