Author: on&off
Subject: Memory Error with Dual Quad Kits, None with Single
Posted: 20 Feb 2016 at 6:44am
Thank you so much for your amazingly elaborate and comprehensive reply.
The reason I went with the 2x32gb kit rather than the 1x64gb kit is because of the QVL documentation as presented at both the ASRock and G.Skill websites for the relevant components, which made me conclude (in my inexperience) that the 4x8gb kits were compatible with the motherboard, whereas the 8x8gb kit was not.
I find it necessary to point out how I came to that conclusion, in the hope that these WebPages will be updated in the future with more accurate information, to make things clearer for everyone . I am attaching some PDF captures of the mentioned WebPages as they appear now, in case the information is updated in the future.
In the ASRock Memory QVL for the X99X Killer MotherBoard the G.Skill 8x8gb kits (e.g. F4-2133C15Q2-64GRR) are not listed, whereas the 4x8gb kits are (e.g. F4-2400C15Q-32GRR). Secondly, according to "Note1: Quad Channel: V = supports 4 modules and 8 modules" the F4-2400C15Q-32GRR supports 8 modules. Since F4-2400C15Q-32GRR is a 4x8gb kit, I logically assumed that it meant 2 kits of 4, especially since the 8x8gb kits were not listed. Site / PDF
When I referred to the G.Skill Ram Configurator for this motherboard there were no 8x8gb kits available in the "DDR4 2400MHz" category, but it listed the 4x8gb kits as compatible. Site / PDF
When I performed a product search on the G.Skill website for "DDR4", "64gb (8gbx8)", "Quad Channel Kit" the only 2400MHz option was the F4-2400C15Q2-64GRK. Site / PDF
The QVL List of F4-2400C15Q2-64GRK, from the search above, doesn't show the ASRock X99X Killer MotherBoard as compatible. Site / PDF
Whereas, the QVL List of F4-2400C15Q2-32GRK, which you get as a search result of "DDR4", "32gb (8gbx4)", "Quad Channel Kit", clearly shows the ASRock X99X Killer MotherBoard as compatible. Site / PDF
Which led me to conclude that the 8x8gb kits were not compatible with my motherboard, whereas the 4x8gb were. I don't know if the QVL Specification of F4-2400C15Q2-64GRK is an error, oversight or an omission, but it totally skewed my interpretation.
I would have definitely gone for the 8x8gb kit had I not misinterpreted the QVLs (or been misled by the absence of certain information) and realised earlier (pardon my ignorance) that the 8 matched kits are always likely to be more compatible. I have already spent quite a bit extra, in trying to get these matched kits rather than regular ones, to avoid the pitfalls of Voltage Adjustments.
I don't have the knowledge or experience to get into the subtleties of OverClocking Memory or the time it would take to get it absolutely right. Neither can I afford to have it even slightly unstable, since this is a system meant for serious work. I was hoping to get the requisite help from the XMP profiles which I paid all the more for.
I'll try to contact G.Skill support and see if they can accommodate.
Subject: Memory Error with Dual Quad Kits, None with Single
Posted: 20 Feb 2016 at 6:44am
Thank you so much for your amazingly elaborate and comprehensive reply.
The reason I went with the 2x32gb kit rather than the 1x64gb kit is because of the QVL documentation as presented at both the ASRock and G.Skill websites for the relevant components, which made me conclude (in my inexperience) that the 4x8gb kits were compatible with the motherboard, whereas the 8x8gb kit was not.
I find it necessary to point out how I came to that conclusion, in the hope that these WebPages will be updated in the future with more accurate information, to make things clearer for everyone . I am attaching some PDF captures of the mentioned WebPages as they appear now, in case the information is updated in the future.
In the ASRock Memory QVL for the X99X Killer MotherBoard the G.Skill 8x8gb kits (e.g. F4-2133C15Q2-64GRR) are not listed, whereas the 4x8gb kits are (e.g. F4-2400C15Q-32GRR). Secondly, according to "Note1: Quad Channel: V = supports 4 modules and 8 modules" the F4-2400C15Q-32GRR supports 8 modules. Since F4-2400C15Q-32GRR is a 4x8gb kit, I logically assumed that it meant 2 kits of 4, especially since the 8x8gb kits were not listed. Site / PDF
When I referred to the G.Skill Ram Configurator for this motherboard there were no 8x8gb kits available in the "DDR4 2400MHz" category, but it listed the 4x8gb kits as compatible. Site / PDF
When I performed a product search on the G.Skill website for "DDR4", "64gb (8gbx8)", "Quad Channel Kit" the only 2400MHz option was the F4-2400C15Q2-64GRK. Site / PDF
The QVL List of F4-2400C15Q2-64GRK, from the search above, doesn't show the ASRock X99X Killer MotherBoard as compatible. Site / PDF
Whereas, the QVL List of F4-2400C15Q2-32GRK, which you get as a search result of "DDR4", "32gb (8gbx4)", "Quad Channel Kit", clearly shows the ASRock X99X Killer MotherBoard as compatible. Site / PDF
Which led me to conclude that the 8x8gb kits were not compatible with my motherboard, whereas the 4x8gb were. I don't know if the QVL Specification of F4-2400C15Q2-64GRK is an error, oversight or an omission, but it totally skewed my interpretation.
I would have definitely gone for the 8x8gb kit had I not misinterpreted the QVLs (or been misled by the absence of certain information) and realised earlier (pardon my ignorance) that the 8 matched kits are always likely to be more compatible. I have already spent quite a bit extra, in trying to get these matched kits rather than regular ones, to avoid the pitfalls of Voltage Adjustments.
I don't have the knowledge or experience to get into the subtleties of OverClocking Memory or the time it would take to get it absolutely right. Neither can I afford to have it even slightly unstable, since this is a system meant for serious work. I was hoping to get the requisite help from the XMP profiles which I paid all the more for.
I'll try to contact G.Skill support and see if they can accommodate.
