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12GB on 1156?

post #1 of 7
Thread Starter 
Hi everybody

I have an ASUS P7P55D-E with an Intel i7-860 and I'm thinking of upgrading the RAM. I am donating a lot of the old components form my rig to a computer I am building for a friend and was thinking of giving him my old 8GB 1333MHz RAM.

My question is: can I have 2x 2GB modules and 2x4GB modules in this dual-channel config? Or do all 4 modules have to be the same size?

Thanks

hcetech
 
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post #2 of 7
Yes, it will work in dual-channel.

However, does he need more than 8GB? If not, just sell it.
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post #3 of 7
Depends, take a read of this.

Quote:
Do I need the same size RAM sticks to run in Dual Channel? Yes (AMD at this point says yes)/No (Intel) but you do usually want the same speed and latency as every thing clocks down to the slowest of both. Example 533Mhz CL4 mixed with 667Mhz CL5 will go with the slowest of both 533Mhz CL5 (not always with the latency) and slower than if either were matched. Same size sticks will run slightly faster symmetric RAM array (Interleaved). If the RAM is of different sizes it runs in what is called “asymmetric RAM array” (Intel Flex Memory/ AMD does not support). The greater the disparity between your 2 sticks the greater the performance hit vs sticks of the same size. The difference seems to be approximately in proportion to the ratio of the the smaller stick x2 to the entire amount of RAM. An example with Intel, 1GB stick and 2GB stick. 2/3, 1GB(smallest stick)x2 to 3GB(the entire amount). Well 2/3 of the total improvement, of the Dual Channel running with the same size sticks (symmetric RAM array) 10%, the asymmetric RAM array example is about 6.7% so a 3.3% less than symmetric RAM array. With 512MB stick and 2GB stick, 512MB(smallest stick)x2 to 2.5GB(the entire amount). 1/2.5 4% improvement. AMD's will show greater improvements and losses, Dual/Single keep that in mind.
The short and skinny of it is that you want the timings and speeds to be the same, as they will clock down to the lowest denominator. AMD might let you use different stick sizes, and Intel more than likely will.
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post #4 of 7
Thread Starter 
Quote:
Originally Posted by DuckieHo View Post
Yes, it will work in dual-channel.

However, does he need more than 8GB? If not, just sell it.
Thanks - I think I may just give him 4GB then and keep 2 modules for myself.

Do all the DIMMs have to be at the same frequency?

Thanks.
 
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post #5 of 7
Thread Starter 
Quote:
Originally Posted by Zen00 View Post
Depends, take a read of this.



The short and skinny of it is that you want the timings and speeds to be the same, as they will clock down to the lowest denominator. AMD might let you use different stick sizes, and Intel more than likely will.
Aah, thank you.
 
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post #6 of 7
I have the same setup with memory. it works fine in dual channel yet

All mine is DDR3 1866...same brand; with the same timings. Though I have it running at 1600MHz anyway for my OC to work out well. That was a waste of money.

Is it needed? heh, the highest memory usage I've seen in regular use has been a little over 6GB. I just have it in there since I wasn't needing it anywhere else currently. Though I was fortunate that I was still able to OC just as well. If I had the choice of "only" 8GB of memory or 200MHz it would be a no brainer. Sometimes four sticks will hurt your OC.
Edited by Vagrant Storm - 6/8/11 at 6:36am
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post #7 of 7
It will work, but as other have said you want the same frequency/timings on the dimms. This way they run at there rated speeds. Its also important to make sure they have the same operating voltage listed in the specs.

Honestly though 12 gb is overkill. Unless your doing some serious 3d rendering or cad or similar stuff 4gb would be more than enough.
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