Johan’s awesome overview of the Haswell-EP ecosystem showed that the server processor line from Intel is firmly in the track for DDR4 memory along with the associated benefits of lower power consumption, higher absolute frequencies and higher capacity modules. At that point, we all assumed that all Haswell-EP Xeons using the LGA2011-3 socket were DDR4 only, requiring each new CPU to be used with the newer generation modules. However thanks to ASRock’s server team, ASRock Rack, it would seem that there will be some Xeons for sale from Intel with both DDR3 and DDR4 support.

Caught by Patrick at ServeTheHome, ASRock Rack had released their motherboard line without much of a fuss. There is nothing strange about that in itself; however the following four models were the subject of interest:

A quick email to our contacts at ASRock provided the solution: Intel is going to launch several SKUs with a dual DDR3/DDR4 controller. These processors are available in eight, ten and twelve core flavors, ranging from 85W to 120W:

QVL CPUs for ASRock Rack EPC612D8T
  E5-2629 v3 E5-2649 v3 E5-2669 v3
Cores / Threads 8 / 16 10 / 20 12 / 24
Base Frequency (GHz) 2.4 2.3 2.3
L3 Cache (MB) 20 25 30
TDP (W) 85 105 120

At the current time there is no release date or pricing for these DDR3 Haswell-EP processors, however it would seem that ASRock Rack is shipping these motherboards to distributors already, meaning that Intel cannot be far behind. It does offer a server team the ability to reuse the expensive DDR3 memory they already have, especially given the DDR4 premium, although the processor counts are limited.

CPU-World suggested that these processors have dual memory controllers, and we recieved confirmation that this is true. This could suggest that all Xeons have dual memory controllers but with DDR3 disabled. Note that these motherboards would reject a DDR4-only CPU as a result of their layout. It does potentially pave the way for combination DDR3/DDR4 based LGA2011-3 motherboards in the future. We have also been told that the minimum order quantity for these CPUs might be higher than average, and thus server admins will have to contact their Intel distribution network for exact numbers. This might put a halt on smaller configurations keeping their DDR3.

Source: ServeTheHome, ASRock Rack

Additional (9/25): We have been asked to make clear that these CPUs will not be on general sale for end-users. Only those companies with large minimum-order-quantities will be able to obtain the CPUs, and as a result these motherboards might find their way into complete servers only, rather than be up for sale individually. These are off-roadmap processors, not intended for general release.

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  • TiGr1982 - Thursday, September 18, 2014 - link

    Yes, but that's a special case (not just DDRn/DDR(n+1) I've mentioned).
  • TiGr1982 - Thursday, September 18, 2014 - link

    OK, I just meant, these DDR Haswell-EP server boards were already on ASRock website on September 9, and a person noticed that then.
  • TiGr1982 - Thursday, September 18, 2014 - link

    "DDR3 Haswell-EP server boards", I meant;
    the comment editing functionality is lacking here, unfortunately.
  • hrrmph - Thursday, September 18, 2014 - link

    It's a feature, not a flaw ;)

    And it's one that I am lobbying for them to keep.
  • TiGr1982 - Thursday, September 18, 2014 - link

    Jokes aside, no "Edit" function for comments makes no sense, because in order to correct himself/herself, one has to post one more comment. This lengthens the comments thread without any constructive reason.
  • makerofthegames - Thursday, September 18, 2014 - link

    It prevents retconning your statements - on places with editing, I've seen people edit their comments to act like they had been arguing for X the whole time, when they had actually been arguing for Y and want to "win" the argument by joining the winning side. It's dumb, and shouldn't be allowed.

    It *should* also make people check what they say before they post it. It works on some no-edit sites, but it seems to have less impact here.
  • stephenbrooks - Thursday, September 18, 2014 - link

    How about append-only edits?
  • maecenas - Thursday, September 18, 2014 - link

    Agree with this - it would not only prevent recanting but it would also show the correction right next to the mistake so there's less confusion, not to mention shorter comment threads.
  • TiGr1982 - Thursday, September 18, 2014 - link

    Yes, at least there should be a smarter way (better than current implementation).
  • Klimax - Saturday, September 20, 2014 - link

    Some places solved that by allowing only two hours for edit after posting. (vB based forums like

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