Overclocking my Ryzen 5 1600 above stock speeds leads to bad memory performance

[Patrick-Langenecker]

Hey, I am observing a strange problem with my CPU overclock right now (my detailed hardware is listed below). My memory performance gets absolutely worse if I go above the stock speed of my Ryzen 5 1600. CPU-Z reports the normal RAM frequency (3200 MHz) but SiSoftware Sandra shows that the actual RAM frequency is around 2.69 MHz when the CPU is set to 3.8GHz. If I overclock the CPU even further to 3.9GHz the gap between CPU-Z and SiSoftware Sandra gets even bigger. This strange behavior results into bad overall performance. I also double checked the RAM performance with the cache and memory benchmark of AIDA64. On stocks Speed I got the highest memory bandwidth which proofs the lower RAM frequency reports of SiSoftware Sandra are actually true when the CPU is overclocked. Am I missing something obvious here?



OS: Windows 10 professional 64 bit
CPU: Ryzen 5 1600 3.2GHz
Mainboard: MSI X370 GAMING PLUS (latest BIOS version 7A33v5B)
Memory: G.Skill Ripjaws V Black 16GB (2x8GB) DDR4-3200 - F4-3200C16-8GVKB
GPU: Gigabyte GeForce GTX 770 Windforce 3X OC 2GB
Power supply: 600 Watt Coba Nitrox Modular 80+

 

[CountMike]

My experience is quite opposite, which way are you overclocking ?

 

[Patrick-Langenecker]

I set all my values in the BIOS. The 3.8GHz overclock was achieved by bumping up the CPU multiplier to 38 and the CPU voltage to 1.25V. My memory frequency is also set to 3200MHz nothing is left on Auto.

 

[CountMike]

VDDCR Soc voltage 1.1V ? Also may want to play with LLC for VDDCR Soc.

 

[Patrick-Langenecker]

I left the VDDCR Soc voltage on 1V. I will bump it up to 1.1V and check the results thank you for the tip.

 

[Patrick-Langenecker]

The VDDCR Soc voltage was not the problem I tested a variety of voltages from 1V up to 1.2V. I also increased the CPU voltage to 1.3V. It seems i am hitting a 2666MHz memory bandwidth wall that only occurs when i am pushing the CPU frequency out of spec.

 

[jharrison1185]

1.2V SOC for sure.

 

[iliekos]

Amd said that the maximum ddr4 for ryzen 5 1600 is 2400 and no guarantee that higher speed will work so I think u should try to overclock u ram at 2400 and check u performance I got an ryzen 1600 with 16 GB ddr4 at 2400 an the performance are great hope this helps peace.