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Mixing 1600mhz with 1866mhz

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July 27, 2011 9:24:47 PM

Hey guys this is the first time ive used this forum so i hope yall can help me...im building a pc and i currently have 3x2 corsair dominator ram 1600mhz timing 8-8-8-24 1.65v but i have a friend that is selling his 3x2 Corsair dominator ram 1866mhz for really cheap it runs at 9-9-9-24. So my question is can i use that ram with my 1600mhz that i already have? Its my thought that i could just down clock the 1866 to 1600 and just run it that way but im not sure so any help would appreciated.

More about : mixing 1600mhz 1866mhz

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a b } Memory
July 27, 2011 10:24:58 PM

in theory cant see why not--but it may depend on your other components--on my gigabyte ga-ex58-ud5 if i run 6gb in 3x 2gb modules at 1600mhz at 8-8-8 no problem can overclock the ram up to 1720mhz stable

but when i add my other 3x 2gb sticks of identical memory at the same 8-8-8 and same voltage nothing i do will make the pc stable-- all the sticks pass memtest no problem and i can pick any of the sticks at random and any will be totally stable at 1600mhz as long as its only 6gb

but i have to underclock the memory to 1280mhz to be stable with 12gb--although i can run that speed with better timings at 7-7-7 and 1t command rate

so i think either the x58 chipset has a problem with the 6 slots populated or the i7 920 cpu has an issue with all 6 slots populated--something to do with onboard memory controller i presume

so would do a google for your motherboard and cpu having any issues with 6 memory modules before parting with your hard earned cash--or ask your friend to try before you buy :D 
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July 27, 2011 10:52:27 PM

Thanks for the fast response. My other componets are as listed: EVGA x58 Motherboard (has six memory slots using tri channel), i7-950 with tri channel support and i think up to 24gb. I cant find anything on the subject when i search google all that i get is the specs of my board...
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a c 347 } Memory
July 28, 2011 12:03:05 AM

The GT's are very robust and often at a lower Frequency the CAS timings can often be lowered as well. In any case there's never a guarantee 'Mixing' -- if you do then I strongly recommend that you set the DRAM Frequency -> DDR3 1600 MHz, CAS Timings {try both as shown below}, set the Command Rate -> 2, and the DRAM Voltage -> 1.65v.

In both cases test the RAM with a minimum of 4 passes or atleast 1-2 hours with Memtest; create a bootable CD/DVD, use the ISO/zip file -> http://www.memtest.org/

Mixing:
1600 MHz 8-8-8-24-2N 1.65v 3X2GB
1866 MHz 9-9-9-24-2N 1.65v 3x2GB ; CMT6GX3M3A1866C9 often 'can' run 1600 MHz 8-8-8-24-2N 1.65v
===========================
1600 MHz 9-9-9-24-2N 1.65v 6x2GB ; probable


1600 MHz 8-8-8-24-2N 1.65v 3X2GB
1600 MHz 8-8-8-24-2N 1.65v 3X2GB ; CMT6GX3M3A1866C9
===========================
1600 MHz 8-8-8-24-2N 1.65v 6x2GB ; possible

CMT6GX3M3A1866C9


CMT12GX3M6A1866C9 running at 1600 MHz 8-8-8-24-2N 1.65v
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July 28, 2011 12:54:28 AM

Thanks for the displays that helps alot it was a little hard to understand at first but i think i got what you meant. Thanks again
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a c 347 } Memory
July 28, 2011 1:00:10 AM

Anything you want me to explain?
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July 28, 2011 1:11:27 AM

No thanks i think i got it thanks though
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a b } Memory
July 28, 2011 9:00:27 AM

Redneck Techy said:
Thanks for the fast response. My other componets are as listed: EVGA x58 Motherboard (has six memory slots using tri channel), i7-950 with tri channel support and i think up to 24gb. I cant find anything on the subject when i search google all that i get is the specs of my board...



try googling i7 problem with 12gb of ram--looks like its due to the integrated memory control--some people ok others having trouble overclocking and running the memory at 1600mhz like i have
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July 29, 2011 7:37:49 PM

Best answer selected by Redneck Techy.
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