RAM confusion -Fatal1ty X99 Professional Gaming i7
Printed From: ASRock.com
Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=4116
Printed Date: 22 Jul 2025 at 5:48am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: RAM confusion -Fatal1ty X99 Professional Gaming i7
Posted By: smusan
Subject: RAM confusion -Fatal1ty X99 Professional Gaming i7
Date Posted: 29 Dec 2016 at 8:46am
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" rel="nofollow - Hi folks! I need your help! I'm confused regarding witch ram is suitable for Fatal1ty X99 Professional Gaming i7 motherboard. Let me explain... In official site: http://www.asrock.com/mb/Intel/Fatal1ty%20X99%20Professional%20Gaming%20i7/#Overview at the very bottom says that "This motherboard is capable of supporting DDR4 ECC and RDIMM (Registered DIMM) memory modules which deliver server-grade performance and durability for high-powered computing systems." but on the specification tab of the same page it says, that it "Supports DDR4 ECC, un-buffered memory/RDIMM with Intel® Xeon® processors E5 series in the LGA 2011-3 Socket" (link of the specification page: http://www.asrock.com/mb/Intel/Fatal1ty%20X99%20Professional%20Gaming%20i7/#Specification) My confusion comes from using RDIMM abbreviation in specification tab, because RDIMM stands for "Registered RAM", but in same sentence it says that it doesn't support it?? Now what exactly type of RAM this motherboard supports for Xeon cpu? ECC & buffered (Registered) RAM? ECC & unbuffered (Unregistered) RAM? Or both type of RAM supports? I'm building my first Xeon PC with 128gb RAM and as you expect I don't want to f*** it up. My whole order stopped because of this so I appreciate the fast response. Thank you all in advance! |
Replies:
Posted By: wardog
Date Posted: 29 Dec 2016 at 10:58am
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" rel="nofollow - My first question to you will be, what will you be doing on this computer? Gaming? Or mission critical computing? |
Posted By: smusan
Date Posted: 29 Dec 2016 at 6:09pm
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" rel="nofollow - Workstation & 24/7 NAS server with daily automatic backup of 4 other computers. Why Desktop and not Asrock workstation grade motherboard? Because I need more I/O ports then Workstation mobo can offer + I already have Nocua NH-D15 with only square-ILM 2011-3 mounts, so I don't plan buying another CPU fan Why Fatal1ty over Taichi? One reason: Fatality has already better built-in WiFi network, which is a MUST. So now to my question... Which server types of RAM does this motherboard support?
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Posted By: wardog
Date Posted: 29 Dec 2016 at 8:01pm
NAS and backups over WiFi?  I guess.RDIMM is Registered(Buffered) ....... Aw heck. Here I found this for you to read instead of my typing what I normally do when asked this https://en.wikipedia.org/wiki/Registered_memory And IMO you don't have a real big yank to empty your wallet over buying ECC memory. Yes, workstation boards don't have that many USB ports when compared to an enthusiast/desktop board. |
Posted By: smusan
Date Posted: 29 Dec 2016 at 11:36pm
 Hope this picture will give you my understanding where is my problem. This picture is taken from Asrock Fatal1ty X99 official site, tab Specification. Through my deduction i concluded that this motherboard supports: - ECC and unregistered DIMM, - nonECC and registered DIMM for Xeon processors. Is my deduction correct? |
Posted By: parsec
Date Posted: 29 Dec 2016 at 11:49pm
First, the types of memory that can be used with this board, or any X99 board, depends upon the processor type/model being used with the board. The two types of processors that can be used in X99 boards are the consumer/PC Haswell-E and Broadwell-E HEDT models, and the equivalent generation server/enterprise Xeon processors. The consumer HEDT processor models only support standard PC DDR4 memory. The server Xeon processors support the registered or unregistered, and ECC types of memory. wardog's link explains the registered or unregistered aspect. That is a limitation caused by Intel's specification differences between the two type of processors. The specification page for the Fatal1ty X99 Professional Gaming i7 includes this: Supports DDR4 ECC, un-buffered memory/RDIMM with Intel® Xeon® processors E5 series in the LGA 2011-3 Socket That is key between support for the basically two types of memory. ------------- http://valid.x86.fr/48rujh" rel="nofollow"> 
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smusan wrote:Posted By: smusan
Date Posted: 30 Dec 2016 at 12:55am
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First, I would like to thank you for helping with long reply but still I'm not getting. This bold sentence in quotes I cannot understand and it's driving me crazy. if (un-buffered == un-registred) why than in this sentence is used RDIMM abbreviation? Shouldn't be correct UDIMM? Like ECC UDIMM? That means this MOTHERBOARD supports ECC UDIMM (where UDIMM is Unregistered DIMM) and non-ECC RDIMM (where RDIMM is Registered DIMM), but not both(ECC RDIMM -)??? |
Posted By: Xaltar
Date Posted: 30 Dec 2016 at 1:07am
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Registered DIMM = RDIMM ECC (Error Correcting Code) can be unbuffered/unregistered or registered/buffered. ECC just means the memory is designed to correct memory errors for maximum stability and reliability. The sentence is basically saying it supports all those combinations when used with a Xeon CPU. The unbuffered/RDIMM is a bit erroneously written but is meant to mean it supports either, there is no combination of unbuffered and Registered as they are opposites. ------------- 
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Posted By: smusan
Date Posted: 30 Dec 2016 at 1:31am
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OK, I finally got it! Yea, for me it was strange as in that sentence unbuffered/RDIMM disputed itself. Thank you for clearing my problem. KR S |