Why are there no 2 x16GB ddr4 kits?

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manhuco

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Aug 11, 2013
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Hi

I'm looking at getting one of the x99 mobos. The boards have 8 memory slots for up to 128GB ram. When prices come down, I eventually would like to fill up as many of the slots as I can, without throwing away any of the modules. For now, I only have money to buy 2 x16 GB modules. However, I can't find any such memory kits, even though 16GB ddr4 modules obviously exist. Any help would be appreciated. If the memory architecture is quad channel, can I use only two modules, or do I need to populate at least 4 ?

Thanks a lot.
 
Solution
Tradesman1
DRAM manufacturers haven't really gotten much into 16GB sticks yet, and sort of doubt they do for awhile, right now the X99 is it as far as running DDR4, nothing in site from AMD and more mainstream (lower cost) dual channel platforms are still out in the future. Yes you can go with a 2x set of DRAM, the X99 can run dual channel just fine
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manhuco

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Aug 11, 2013
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Do you know why this us ?

If the board is quad channel is their any problem with populating just two of the slots ?

Thanks

 
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Tradesman1

Tradesman1

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Jun 5, 2013
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DRAM manufacturers haven't really gotten much into 16GB sticks yet, and sort of doubt they do for awhile, right now the X99 is it as far as running DDR4, nothing in site from AMD and more mainstream (lower cost) dual channel platforms are still out in the future. Yes you can go with a 2x set of DRAM, the X99 can run dual channel just fine
 
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Solution
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Pinhedd

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Aug 7, 2007
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8 gigabit DDR4-SDRAM ICs and 16 gigabit DDR4-SDRAM stacked ICs are still in the engineering sample stage, they haven't yet reached full production. Once they reach full production we'll start to see 8GiB single-rank and 16GiB dual-rank DDR4 DIMMs
 
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yumri

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it will still run in quad channel if put in correctly even though the packageing says dual channel the RAM sticks do not care as long as the signals are the same which to the RAM sticks the signals will be the same just to the RAM controller they will all be the same bank of RAM of 4 sticks not 2 banks of 2 sticks of RAM.
 
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Pinhedd

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Aug 7, 2007
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You're absolutely right about that. What Tradesman1 said is that all of the DDR4 modules on the market right now are packaged as quad-channel kits because the only DDR4 platform is Intel's X99 with the LGA-2011-3 socket which uses a quad-channel DDR4 memory controller. Down the road they're expected to introduce a new mainstream platform that uses a dual-channel or triple-channel DDR4 memory controller.
 
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manhuco

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Aug 11, 2013
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sorry in advance for my ignorance :) but does this mean that i can use dual channel ddr3 modules in an x99 ddr4 board, and then populate the rest of the x99 memory slots with quad channel ddr4 sticks when they become more affordable ?

thanks
 
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Pinhedd

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No. DDR3 DIMMs and DDR4 DIMMs are both mechanically and electrically incompatible
 
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Pinhedd

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All major operating systems will use uncommitted memory to form a soft page cache. Thus, there's always a benefit to having more memory.
 
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