GA-X58A-UD3R question

To be able to address more than 16GB RAM, u need to have W7 Pro and higher windows.

I have win7 home x64

Is it possible to do that configuration ? Also once I change the dims around is their any thing I need to change in the bios?

You know, if u use the different sizes, than u don't have your RAM configured in the triple channel mode, but it is flex mode, so performance is lower.

But it is nothing to worry about.

It should work, just not in the triple mode.

I am not sure where would I find that out?

On the butom @ Voltage.

OK, do u see there is a part #, post 1 for each type.

They are OK @ 1.65V.
http://www.newegg.com/Product/Prod [...] 6820220369

http://www.tigerdirect.com/applica [...] CatId=4325

Go to msconfig and check if the Max. memory is clear...

ill check that out

The voltages goes across all DIMM slots, and otherwise the 4GB is in the primary DIMM per Channel and the 2GB in the secondary DIMM slots per Channel.

When I searched both sets they're 1.65v at DDR3-1333 9-9-9-24-2N.

BTW - duh, I forgot LGA 1366 defaults @ DDR3-1066 so add: System Memory Multiplier -> 10 ; 10 * 133.33 is DDR3-1333.

Recap:

1. Install CPU: | 2GB | 4GB | 2GB | 4GB | 2GB | 4GB |
2. BIOS:
System Memory Multiplier -> 10
DRAM Voltage -> 1.64v
QPI/Vtt Voltage -> 1.35v
* CAS Timings

Save & Exit = Yes

Good Luck!

--

To set the CAS Timings:
BIOS: {* CAS Timings}
Extreme Memory Profile (X.M.P.) -> Disabled ; MUST be Disabled in ANY mix!
DRAM Timing Selectable -> Quick
CAS Latency Time -> 9
tRCD -> 9
tRP -> 9
tRAS -> 24

Personally, I never mix densities, IC's, or any mix, but if after the configurations above and works next is to create a bootable CD/DVD of Memtest86+ (ISO/zip file). Run for at least 4 passes or tonight overnight. Memtest -> http://www.memtest.org/ then you'll know.

I also always set the RAM manually in the BIOS, I don't give it a second thought.

Is the RAM working properly after the changes?

I hear you... Keep in mind (2) Matching Kits --- is still 'mixing' the RAM; do not use XMP. If you go to e.g. NewEgg and compare kits 3x4GB and 6x4GB you'll notice some missing CAS timings; it's no accident --- the CPU's IMC can only handle certain Frequency + CAS + Densities.

Fortunatly, DDR3-1333 is EASY @ CAS 9 24GB, but DDR3-1333 is much HARDER @ CAS 7 24GB.

On DDR3-1333 it's nothing to worry about, the BIOS in particular XMP won't be my recommendation for (3x4GB) + (3x4GB). Yes, there's a reason for fully matched sets but generally for >DDR3-1600 where, as mentioned, a fully matched and Rated 'single' set is the best idea.

IMO your problem was 1.65v vs the default 1.50v, and more than likely if you do what I posted and the sets are what you said they are it 'should' work. Unless you're Rendering, huge database or RAM Drive 12GB is fine. I do the later of the two and 'get' the reasons for a lot of RAM. You could also has a bad stick or worst bad DIMM slot(s) which is why I recommended the BIOS changes and running Memtest before spending time + money.

I OC RAM (a lot) higher than its Rated specs all of the time, and clearly I achieve 'faster' performance on (1) stick per channel and when I load up all the DIMM slots yep both CAS and Frequency are affected; generally one or the other.