Renowned overclocker Buildzoid addressed some shortcomings in XMP RAM profiles in his latest video. The focus of the video was on the 4800 MHz DDR4 memory kidollar series, and it was discovered that at these settings the memory offered lower performance compared to the 2666 MHz JEDEC standard.

The system used XPG Spectrix D50 DDR4 memory rated for 5000 MHz with XMP profile, an Aorus Z590 Master motherboard and a Core i9-11900K (@ 5.1GHz) processor. However, the memory was running with the 4800 MHz XMP profile due to some issues with 5000 MHz in Rocket Lake.

Buildzoid reports that in 3DMark TimeSpy, the XPG Spectrix kit scored 12,035 while operating at 2666 MHz in the JEDEC configuration. However, with the XMP profile turned on, the score drops to 11,556 points, meaning system performance is negatively impacted even at “faster” memory speeds.

According to the user, these strange results are due to terrible timings in the XMP profile for the 4800 MHz kit. The primary timings are normal, but the secondary timings are messing things up.

RAM Frequency and Delay Values

Settings JEDEC (2666MHz) XMP (4800MHz)
Primary Timings 19-19-19-43-2T 19-28-28-46-1T
tWR 20 24
TRFC 467 842
tRRD_L 7 15
TRRD_S 4 19
tWTR_L 10 17
tWTR_S 4 11
tRTP 10 12
tFAW 28 65
tCWL 18 18

You can see from the table that some memory timings are quite high. Therefore, despite the high RAM frequency, the kit loses its configuration used at 2666 MHz. When the increase in timings is too high, the performance advantages of 4800 MHz are lost.

Worse still, it is difficult to fully understand the problems of modules due to some shortcomings in XMP. XMP doesn’t list the sub timings in detail until you buy the memory and tweak it in the BIOS or apps like Ryzen Master.

Buildzoid states that this is more of a memory kit issue, as many of the XMP sub-timings are set by the actual profile, not by auto-timers from the motherboard. Memory manufacturers can use high timing values ​​to increase memory compatibility with systems.

Unfortunately there is no direct way to fix this problem when buying new memory. In this regard, you can benefit from the experiences of experienced users at Technopat Social. Other than that, you can opt for the tested and configured memory kidollar series listed by motherboard manufacturers.

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Michael Lewis


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