All motherboards in the market come with a document called QOL (Qualified Vendor List), which consists of a list that mentions the components compatible with a specific motherboard. This is particularly useful when checking the compatibility of RAM kits on a motherboard. However, this is only a theory, because while RAM and motherboard manufacturers are working on this document, there are case where the combination of the two does not work correctly. Are they point errors or supine deception?
This would be the case presented by a forum member Igor’s Lab, where he explained that when he bought 2 RAM memory kits from different manufacturers, listed as “XMP compatible” according to the QVL of his motherboard, they did not work correctly. The affected motherboard was a GIGABYTE Z690 Gaming X (DDR5), which had a BIOS update and even an RMA for a new one, but none of that managed to get the RAM to work.
After that, the plate was sent to the laboratory of Igor himself to carry out the relevant tests; starting with the use of the kit 16GB ADATA XPG Launch 6000MHz DDR5 RAM where the biggest surprise is… it won’t start. By simply putting the XMP profile on these memories, the card restarts a total of 10 times, ending up in recovery mode. This is in stark contrast to GIGABYTE’s QVL, which states they should work.
The compatibility of the QVL list of motherboards… Isn’t it true?
For this reason, the technical service of gigabyte on the meaning of QVL, where they clarified that the “V” for seller indicates that it will only work in specific cases, specifying that the “production variations” from CPU would be the Causes RAM and XMP compatibility issues on some motherboards. After learning about this, they proceeded to the corresponding tests, choosing from 60 processors those with the best BMI (Integrated Memory Controller) under DDR5 which they had (Core 12 obviously).
Surprisingly, the RAM tests failed in all cases, showing that this specific QVL did not conform to what was written. Changing the processor did not improve the situation, since it was tested with Pentium, i3, i5, i7 and i9 and none managed to activate the XMP profile of ADATA RAM at 6000 Mbps.
XMP 3.0 does not work according to QVL, and manual setting?
And what can we do to fix a failed XMP? Resort to manually change memory timings. To do this, the voltages and values at which the RAM operates would be adjusted, trying to bring them to their most optimal operating point; thus balancing the speed and operating temperature of the modules.
Here Igor’s performs these tests and comes to the clear conclusion that the excuse used by GIGABYTE about BMI being the cause it was clearly wrong. Tests showed that on this card you had to go down to 5600 MHz instead of the original 6000 MHz, for it to work properly. Logically, it’s not a limitation of BMI due to pure frequency, so it’s something that determines the map itself.
What can we conclude from all this? Whether the QVL of motherboard manufacturers needs to change, you need to guarantee the modules will works 100% in all cases. It is necessary to avoid, as far as possible, that users who are not advanced in the world of overclocking, have to touch the timings of certain RAMs that they have purchased by paying attention to an official compatibility document.
VIA: Igor’s laboratory