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Mixing different RAM?


DrunkenCanadian

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  • Corsair Employees
You should not mix memory and if you are buying the XM2S-6400C3 modules used or from another user there will be no warranty. I would suggest just replacing the memory you have now with one set of Twin2x4096-6400C4DHX for best performance.
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You should not mix memory and if you are buying the XM2S-6400C3 modules used or from another user there will be no warranty. I would suggest just replacing the memory you have now with one set of Twin2x4096-6400C4DHX for best performance.

 

So I can't mix even if their latency/timing is a bit different but the speed is the same? I'm having a hard time finding the CAS 4's. Newegg has seem to have deactivated them and I no other store online has them.

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  • Corsair Employees
The Dominator Version is no longer in production, but you can use Twin2x2048-6400C4DHX and with 4 modules I would suggest setting the memory frequency at DDR667 and set the memory Voltage to 2.1 Volts and set the NB/MCH/SPP Voltage to +.2 Volts as well and test the system with http://www.memtest.org. In addition, with some MB's (Mostly ASUS) you have to disable legacy USB in the bios when running any memory test.
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The Dominator Version is no longer in production, but you can use Twin2x2048-6400C4DHX and with 4 modules I would suggest setting the memory frequency at DDR667 and set the memory Voltage to 2.1 Volts and set the NB/MCH/SPP Voltage to +.2 Volts as well and test the system with http://www.memtest.org. In addition, with some MB's (Mostly ASUS) you have to disable legacy USB in the bios when running any memory test.

 

Are these the ones you are referring to?

 

http://www.zipzoomfly.com/jsp/ProductDetail.jsp?ProductCode=85025-30

 

And I can use 2 of these with my current ones or would you recommend getting 4 of them?

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Are these the ones you are referring to?

 

http://www.zipzoomfly.com/jsp/ProductDetail.jsp?ProductCode=85025-30

 

And I can use 2 of these with my current ones or would you recommend getting 4 of them?

 

If you haven't bought any more DRAM. I would advise you against such a purchase. The 6400C3 module are Micron D9 based and as such do NOT play very well with other DRAM.

 

http://www.newegg.com/Product/Product.aspx?Item=N82E16820145194&Tpk=Twin2x4096-6400C4DHX

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Ok a new problem has arisen. I bought a set of the CM2X1024-6400C4DHX's and whenever I put them in, the computer posts, but it doesn't go past the BIOS splash screen. When I take them out, it does. I even went into BIOS and changed back to default settings and voltage and it still doesn't get past the screen with them inserted. Any advice?
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  • Corsair Employees
With 4 modules I would suggest setting the memory frequency at DDR667 and set the memory Voltage to 2.1 Volts and set the NB/MCH/SPP Voltage to +.2 Volts as well and test the system with http://www.memtest.org. In addition, with some MB's (Mostly ASUS) you have to disable legacy USB in the bios when running any memory test.
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With 4 modules I would suggest setting the memory frequency at DDR667 and set the memory Voltage to 2.1 Volts and set the NB/MCH/SPP Voltage to +.2 Volts as well and test the system with http://www.memtest.org. In addition, with some MB's (Mostly ASUS) you have to disable legacy USB in the bios when running any memory test.

 

Ok I set the frequency and voltage like you said and it still locks up. I did not set the NB/MCH/SPP voltage though. Would that make a difference?

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  • Corsair Employees
With 4 modules I would suggest setting the memory frequency at DDR667 and set the memory Voltage to 2.1 Volts and set the NB/MCH/SPP Voltage to +.2 Volts as well and test the system with http://www.memtest.org. In addition, with some MB's (Mostly ASUS) you have to disable legacy USB in the bios when running any memory test.

 

Ok I set the frequency and voltage like you said and it still locks up. I did not set the NB/MCH/SPP voltage though. Would that make a difference?
Yes it does make a difference and especially so with 4 modules.
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