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SR-2 Memory Compatability

post #1 of 13
Thread Starter 
Hey hey,

My cousin has been putting together a 12 core SR-2 build. It's sick, however he's had problems with the memory compatability. I know motherboard manufacturer's often show lists of compatible RAM, but I had assumed that was just what they had tested.

The problem he's been seeing is that although the BIOS will recognise all the memory (24GB), windows will only recognize 20GB. It's win 7 pro 64 bit btw. The memory is standard gskill desktop ddr3 1600-cl6.

We've tried
- Raising vqpi/vtt to 1.35V
- Lowering memory frequency/timings
- Memtest passes
- Removing individual sticks sometimes gives 2gb less than expected, sometimes 4gb less

Is this really just a case of incompatible memory? How can some memory be incompatible? Isn't the memory interface standardized?
     
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post #2 of 13
I really could't tell you, and what im about to ask wount help you solve this. Sorry in advance.

Post pics of the beast? biggrin.gif
post #3 of 13
I remember seeing a thread on this a while back over at EVGA:

On Booting Memory will be either 24Gb or 20GB

http://www.evga.com/forums/tm.aspx?m=649017&mpage=1&print=true

Troubleshooting missing memory on SR-2

http://www.evga.com/forums/tm.aspx?m=646413
Edited by Lampen - 5/8/11 at 8:31am
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post #4 of 13
My sig rig memory is 100% compatible but not sure if its on the HCL.

As far as not detecting all the memory.

Make sure he plugs in additional 8 pin and 6 pin power connectors to mobo.
Verify memory voltage is actually at 1.65v and not 1.55v
If overclocked bump vtt to 1.35 - 1.4v
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post #5 of 13
Thread Starter 
I forgot to mention yes we had bumped VDimm to 1.65, Vtt was bumped to 1.35V, I guess we can try 1.4V

Thanks Lampen for that thread, unfortunately I didn't see much resolution except that it seems to happen with gskill a lot

I've asked him about the power connectors.
     
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post #6 of 13
Thread Starter 
Quote:
Originally Posted by shadow19935;13428517 
I really could't tell you, and what im about to ask wount help you solve this. Sorry in advance.

Post pics of the beast? biggrin.gif

Haha I'll ask him too when he's done. He managed to get it to fit in a storm sniper which I never thought would work.
     
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post #7 of 13
is he using home premium? im pretty sure that only shows up to 20gb
     
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post #8 of 13
also i found with my EVGA X58 Classy that increasing the IOH and ICH vcore about 0.05v stopped the memory loss i got at higher overclocks.
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post #9 of 13
Thread Starter 
Quote:
Originally Posted by Kal777;13428631 
also i found with my EVGA X58 Classy that increasing the IOH and ICH vcore about 0.05v stopped the memory loss i got at higher overclocks.

Interesting I'll try that
     
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post #10 of 13
Thread Starter 
Quote:
Originally Posted by Sircles;13428620 
is he using home premium? im pretty sure that only shows up to 20gb

64 bit pro, home limits to 16gb I believe. Besides he can take out half the sticks and still have it registering less than it should.
     
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