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RAM compatability with motherboard - not POSTing in Dual Channel setup

Last response: in Motherboards
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August 12, 2013 4:42:42 AM

I have a problem in installing 2 DIMMs of G.SKill memory in my motherboard.

To start with

motherboard is http://www.msi.com/product/mb/KA790GX.html#/?div=Detail
and the RAM is http://geizhals.at/de/g-skill-dimm-kit-4gb-pc2-8000u-cl...

The scenario is like this:

The RAM works in Single Channel mode, installed on Dimm 0 and 3. But as soon as I try to install it on Dimm 0 and Dimm 1 (for Dual Channel) it simple do not POST, just the CPU Fan power up but no signal on screen.

Additional tips

BIOS is flashed to the latest version.
I tested with another motherboard, same problem.
I tested with another pair of identical RAM, same problem.
Also tested with another PSU, same problem.

That means, I'm getting crazy! :) 

Could it be the 2.1v rating? Or because the RAM is PC2-8000?
August 12, 2013 6:57:42 AM

My CPU is an AMD Phenom x4 9650 (2.3GHz Quad Core Socket AM2+ 2MB 95W TDP HD9650WCJ4BGH)

Same colour in this mobo means for Dual Channel, my computer will not POST if I put two modules in two orange slots. However it will if I put one in orange and one in green (but in single channel).

Should I lower the voltages in the DRAM configuration?

Do you see any compatibility issues?

Do you think I am able to make use of 4x2GB (in dual Channel) with those modules?

My ultimate target is two have 8GB RAM in this machine.

Your help is greatly appreciated!!!
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August 13, 2013 4:40:32 AM

Any further help pleasseeee?
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Best solution

a b V Motherboard
August 13, 2013 3:05:40 PM

varactor said:
I have a problem in installing 2 DIMMs of G.SKill memory in my motherboard.

To start with

motherboard is http://www.msi.com/product/mb/KA790GX.html#/?div=Detail
and the RAM is http://geizhals.at/de/g-skill-dimm-kit-4gb-pc2-8000u-cl...

The scenario is like this:

The RAM works in Single Channel mode, installed on Dimm 0 and 3. But as soon as I try to install it on Dimm 0 and Dimm 1 (for Dual Channel) it simple do not POST, just the CPU Fan power up but no signal on screen.

Additional tips

BIOS is flashed to the latest version.
I tested with another motherboard, same problem.
I tested with another pair of identical RAM, same problem.
Also tested with another PSU, same problem.

That means, I'm getting crazy! :) 

Could it be the 2.1v rating? Or because the RAM is PC2-8000?

Yes, it maybe the voltage but IMO it is the entire memory that is causing the issue. As pointed by Werner the MC (memory controller) has a max speed of 1066MHz. So install anything below 800MHz will be the better idea. So get a new memory instead of the advanced timed one.

Or you can try booting into the BIOS and set the frequency to 800MHz and then reboot it. If it boots that's good news or maybe you may never get it to work together. Also if you do not have the latest BIOS, then flash the newest version and then try it.

TBH, it may not work but give it a try. Else get 800MHz memory something like the ones mentioned in the below website - http://www.memorystock.com/memory/MicrostarIntKA790GXMo... Good luck!
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