Ryzen 5600x memory OC drops performance

[xenic]

I'm a bit out of my depth here when it comes to memory overclocking.

 

When enabling DOCP(xmp) on my Corsair Vengeance 4000mhz kit and FCLK at 2000, my system is unstable.

Which is understandable, as an FCLK of 2000 is quite rare to get it running at the moment.

So, with some help from the DRAM calculator from 1usmus, I ran the kit at 3600Mhz. It appears to run stable ( no HW errors in HWiNFO64),

but I'm getting worse performance than running the kit at stock 2133Mhz?

 

Cinebench R20 (multi core)

• Stock (2133Mhz) = 4183
• Custom timings (3600Mhz) = 4017

 

I'm at a lose, what to do here.

 

System:

Ryzen 5 5600x

Asus Prime x570-PRO

Corsair Vengeance DDR4 4000Mhz c19 (2x8)

(https://www.corsair.com/eu/en/Categories/Products/Memory/Vengeance-PRO-RGB-Black/p/CMW16GX4M2K4000C19#tab-tech-specs)

[Fasauceome]

Cinebench is a poor way to see gains from memory speeds.

 

Run basically any game benchmark instead.