Patriot Memory Viper Elite II DDR4 16GB(2 x 8GB) 4000MHz Kit PVE2416G400C0K

En fait il s’agit de RAM 2667 hz CL 19 -19-19-43-62 avec 2 profils de XMP ( Xtreme Memory Performance = overclocking préréglé par le fabricant de la RAM), 3600 hz et 4000 hz.
Pour obtenir 4000 hz ou 3600 hz il faut donc activer le profil dans le Bios. Le voltage monte alors à 1,35 v pour 3600 hz et 1,4 v pour 4000 hz .
Même en XMP cela reste de l’overclocking alors je préfère l’utiliser en 3600 hz ( CM B550M DSH3 v1.7, Ryzen 5600).

Good

At the time of purchase, this was the cheapest possible 4000MHz kit I could find. For good reason. It is actually very slow, latency is extremely high when using XMP. You need to manually tighten the timings, which then depends on your silicon luck and skill.

I could squeeze 16-17-20-20-560 at 1.45V, wouldn’t risk higher voltage than that. At this level, performance becomes acceptable. At 1.4V you could probably get away with CAS17, but AMD systems do not like odd numbered Tcas. Unusually, it did accept an odd number for Trcd (which, along with Trfc are the most important tuning numbers).

Better kits will do tighter timings at lower voltages, but this is very cheap Hynix unbinned stuff, so a lot of what you can get out of the kit is your luck. I would not suggest it for most folks as the XMP C20 timings are way too loose for any sort of performance expectations.