Truth about CPUs supported RAM

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joinasmashgamer

joinasmashgamer

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Feb 8, 2014
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Im confused about some CPUs,. I just want to know whats the real story.
Geeks out there, kindly help me.

HERE:

Memory Specifications

Max Memory Size (dependent on memory type) 32 GB
Memory Types DDR3-1333/1600

My Confusion is:

* What does it mean when it says Memory types = 1333/1600
does it mean that the cpu only support those frequencies? or?
some other says, if cpu has memory type of 1333, it can support 1333 and above,.

OMG! im really confused,. please someone clarify this to me,. thanks!
 
Solution
Tradesman1
What the CPU is rated for is what it will run with no OCC to the CPU itself or it's MC (memory controller), simplae as that, most locked CPUs can run DRAM that is slightly faster than the spec and may require voltgae adjustments, most CPUs that aren't locked can run DRAM that is quite a bit faster, the current K models from Intel for example i.e. the 4770K can generally run up to 3000 w/up to 16GB, 2800 w/ 32GB, the 4670K a little lower 16GB at 2800 and 32GB at 2666....On the AMD side, they have weaker MCs are are more limited, their higher end CPUs like the 8350 tend to top at 8GB (some 16GB of 2133)

http://support.amd.com/en-us/kb-articles/Pages/ddr3memoryfrequencyguide.aspx
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mbarnes86

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Sep 16, 2010
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Hi

With recent cpu's memory controller integrated on CPU chip not motherboard chipset
If only supports 1333/1600 faster ram will be run at these speeds not faster


But always read guidance in motherboard manual or updated info on compatible Tested ram on the motherboard makers website

Regards
Mike Barnes
 
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techgeek

techgeek

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Apr 11, 2004
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Those are the clock speeds. Since Intel moved the memory controller into the CPU, now all contemporary CPU's have an IMC (integrated memory controller). When the CPU says that it supports 1333 and 1600, it means that the manufacturer is guaranteeing that the IMC will work with those speeds. However most IMC's are capable of more, but the manufacturer doesn't guarantee that it will work.

It gets sort of sticky with motherboard manufacturers that say they support DDR3 2800 for example. They've qualified their board to work at those speeds, but since the IMC is just as much if not more responsible for running at that speed, it's a little misleading. They usually put it in some where in fine print that it's CPU dependent.
 
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Tradesman1

Tradesman1

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Jun 5, 2013
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What the CPU is rated for is what it will run with no OCC to the CPU itself or it's MC (memory controller), simplae as that, most locked CPUs can run DRAM that is slightly faster than the spec and may require voltgae adjustments, most CPUs that aren't locked can run DRAM that is quite a bit faster, the current K models from Intel for example i.e. the 4770K can generally run up to 3000 w/up to 16GB, 2800 w/ 32GB, the 4670K a little lower 16GB at 2800 and 32GB at 2666....On the AMD side, they have weaker MCs are are more limited, their higher end CPUs like the 8350 tend to top at 8GB (some 16GB of 2133)

http://support.amd.com/en-us/kb-articles/Pages/ddr3memoryfrequencyguide.aspx
 
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Solution
joinasmashgamer

joinasmashgamer

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so, if my CPU is like intel g3220 which has supported of 1333 freq only, it means no matter i put 1600 or more frequency that the ram has, it will only work as 1333 regardless of the boards specs?
 
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techgeek

techgeek

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Are you asking because you have DDR3 1600 this RAM or are you asking to upgrade to this? If you have DDR3 1333 already, I'm not sure that you'll see enough of an improvement to justify the cost of the upgrade. You may see marginal gains on the integrated graphics performance (if you don't have a discrete GPU), but again it will be pretty small if noticeable at all.

So my answer would be if your intent is to replace DDR3 1333 with DDR3 1600, save your money and spend it on something else that will improve system performance.
 
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joinasmashgamer

joinasmashgamer

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what i mean, if i only run it stock,. no overclocking, etc. so if i have 1600 memory and use it on my G3220, it will underclock to 1333 even if i have mobos that support 1600 or highers freqs.?
 
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joinasmashgamer

joinasmashgamer

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No! im just trying to figure out, if you can run a 1600 memory on G3220 w/c has only 1333 on its spec support. I dont have any 1600 memories yet., just wanting to know the real story of it.
 
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Tradesman1

Tradesman1

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When first installed it will go to the mobos deaults of prob 1066 or maybe 1333, go into BIOS and enable XMP, select profile 1 and give it a try, the BIOS will configure the sticks for 1600...If any problems with that, then may need to raise the DRAM and/or MC voltage...Give XMP a try and let us know....I'll be out for a bit but back within a couple hours and will help if there is any problem
 
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joinasmashgamer

joinasmashgamer

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OMG! im afraid of this,. never adjusted ever since,. im afraid it will not work for me,. but to answer my question,

If i only RUN stock memory, no tweaks, configuration or what so ever
* Even if my mobo supports more than 1333 like 1600 or 1866, etc.,. if my cpu is Intel3220 and I have 1600 ram, knowing that i have a discrete GPU, so my memory will only work as 1333?

 
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