Motherboard supports 16GB DDR3 RAM. Can I use 2x8 GB or do I need 4x4?

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akmac

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Dec 16, 2016
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Basically upgrading a old asus P7P55DE_PRO motherboard paired with a i7 875k (2 memory channels) CPU OC'd to 3.8Ghz. This is what the manual says:
4 x DIMM, Max. 16 GB, DDR3 2200(O.C.)*/1600/1333/1066 Non-ECC,Un-buffered Memory
Dual Channel memory architecture
Supports Intel® Extreme Memory Profile (XMP)
*Hyper DIMM support is subject to the physical characteristics of individual CPUs. Some hyper DIMMs only support one DIMM per channel.
*According to Intel spec definition, DDR3-1600 is supported for one DIMM per channel only. ASUS exclusively provides two DDR3-1600 DIMM support for each memory channel.

The wording on the specifications is a tad confusing to me in regard to which spec (intel or ASUS) trumps what. My question is can I use 2x8GB modules or do I need 4x4?
 
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Multipack
Ah yeah sorry it's max 16gb. I didnt realise it was LGA 1156. Yeah you are right it only supports 4gb modules, so 4x4 it is.

I think it means you need to enable the DRAM O.C. Profile in BIOS to use 4 1600MHz chips on 2.66GHz CPU's which yours is. ASUS provide support for 1600 on all CPU's but to use with a higher freq chip you need to use OC profile. Am pretty sure that way you can use 4 1600 modules. They dont make it simple do they lol.
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akmac

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Dec 16, 2016
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Hi, thanks for the reply. I understand it is dual channel only. Upon further research I have discovered that this particular motherboard only allows for 4x4 configuration with 16GB or RAM. http://www.tomshardware.com/answers/id-2218191/p7p55d-pro-compatible-ram.html ,also I found this in the manual hiding in plain site "You may install 512MB, 1GB, 2GB, and 4GB unbuffered and non _ECC DDR3 into the DIMM sockets".

Now I just need to figure out which RAM is compatible in a 4x4 16GB configuration as the documentation is a little confusing to me. "Supports Intel® Extreme Memory Profile (XMP)
*Hyper DIMM support is subject to the physical characteristics of individual CPUs. Some hyper DIMMs only support one DIMM per channel.
*According to Intel spec definition, DDR3-1600 is supported for one DIMM per channel only. ASUS exclusively provides two DDR3-1600 DIMM support for each memory channel."

Does this mean I can only use 2 DDR3-1600 modules (1 per channel)? Or does the MB specs overrule the intel specs allowing for 1600MHz DDR3 RAM in a 4x4 config?
 
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Multipack

Multipack

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Sep 5, 2016
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Ah yeah sorry it's max 16gb. I didnt realise it was LGA 1156. Yeah you are right it only supports 4gb modules, so 4x4 it is.

I think it means you need to enable the DRAM O.C. Profile in BIOS to use 4 1600MHz chips on 2.66GHz CPU's which yours is. ASUS provide support for 1600 on all CPU's but to use with a higher freq chip you need to use OC profile. Am pretty sure that way you can use 4 1600 modules. They dont make it simple do they lol.
 
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Solution
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akmac

Commendable
Dec 16, 2016
32
0
1,540
To follow up I did purchase a 16GB (4x4GB) Adata XPG V1.0 DDR3 1600MHz kit and it installed without a hitch using XMP. On this MB you can go up to 2200 but anything over 1600 overclocks the BLCK. Thanks for the help MP:p
 
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