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CMT6GX3M3A2000C8 and Asus Rampage II Extreme - Compatibility issues?


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I bought the setup from PC Case Gear about up 10 months ago, and since then have gone through hell with it.


The first RAM set I got was the CMG6GX3M3A2000C8. This happened to be faulty and Memtest+ detectied this. I returned this, only to find out that they no longer had the CMG6GX3M3A2000C8, so Corsair sent me the CMT6GX3M3A2000C8. It also happened to be faulty so I sent it back. I got the replacement and that also seemed to fail so I sent the motherboard and the RAM back. ASUS replaced the motherboard and advised that the new ram and the motherboard were possibly incompatible. The system is not stable and is exibiting very strange and intermitent lock ups. The strange things are:

1. The board and RAM won´t go to 2000Mhz RAM with XMP, even though that´s what ASUS and recommend to do and is supposed to work (ASUS have checked out the board and replaced it as well in good faith)

2. I have to set it to 1800 to post and i still have the intermitent freezes.

3. Memtest runs fine and doesn´t find any issues in multiple passes, and Prime 95 can run for 20 hours with no issues sometimes, and simetimes it freezes the computer in a few minutes.

4. The computer freezes randomly during gameplay, at windows bootup, never at the same times or temperature, sometimes just by idling.

5. The System and App loggs don´t show anything out of the ordinary.

6. A way to crash it that seems to work 99% of the time is to run PC Mark 64 bit (benchmark software), and run all the tests. This usually crashes the PC everytime (at different points). tried with other videocards with same results.


Is anyone able to tell me if there are known compatibillity issues and if so, if there are any workarounds?


I understand how hard it is to troubleshoot an intermittent issue like this, so I appreciate your help. Please understand that its very frustrated since it´s been a while since this computer has been running.



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Your Intel i7-975 CPU is only guaranteed to run the RAM @ 1066 MHz. per the link below. Anything beyond that is overclocking and while the RAM has been tested and confirmed to be able to run at that frequency, that does not mean that your CPU/Mobo/Vid card will all play nice at that frequency. There are no guarantees in overclocking and Intel does not guarantee XMP profiles. They are a best guess of what might work for most people. You may obtain better results with manual BIOS adjustments but still never reach 2000 MHz. RAM frequency stable as this is a huge over clock.




Quote from Intel XMP website:


"Δ Warning: Altering clock frequency and/or voltage may: (i) reduce system stability and useful life of the system, processor and other system components; (ii) cause the processor and other system components to fail; (iii) cause reductions in system performance; (iv) cause additional heat or other damage; and (v) affect system data integrity. Intel has not tested, and does not warranty, the operation of the processor beyond its specifications. Intel has not tested, and does not warranty, the operation of other system components beyond their industry standard specifications. Intel assumes no responsibility that the processor and other system components, including if used with altered clock frequencies and/or voltages, will be fit for any particular purpose."


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Sounds more like your CPU may not be able to OC that high, or needs some more tweaking. Did they build (and test) the system for you, or just send the parts?


I ordered the parts and built the system myself. I have been building systems for a while now, and the last 4 I built (in the last couple of months) i have been just getting DDR3 1600 RAM and setting the XMP in the BIOS (1600) with no issues at all. This computer is the first one I've ever had which is having this issue, and considering the components, I would have thought otherwise.


Is there any possibility of a RAM/mobo incompatibillity? Or, are there some settings that can be recomended?


It does not seem like an OC issue, even were I to make it run at its base values, it still freezes the PC during running.

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