Z370 Pro4 8700k G. Skill 4x8 4133 return Or no?

Hey Guys,

My current rig set up is Asrock Z370 Pro4 i7-8700k RTX 2060.

I recently purchased 2 kits ( 32GB 4x8) of

F4-4133C19D-16GTZKW
Trident Z DDR4-4133MHz CL19-21-21-41 1.35V 16GB (2x8GB)

The first kit came, i was able to run the memory at 4133. Played around with the timings, had some decent benchmarks.


The second kit came in and i'm only able to run 4 sticks at 4000MHZ.

I'm contemplating if it would be better if I returned the 2 kits and instead went with any of the Trident Z 3600C16Q Kits that run DDR4-3600MHZ CL 16-16-16-36.

F4-3600C16Q-32GTRSU
Trident Z Royal Collector Edition DDR4-3600MHz CL16-16-16-36 1.35V 32GB (4x8GB)

Asrock QVL only has compatability listings for 1 2x8 kit for the 4133 and Gskill website doesn't even have it listened as compatible. G. Skills website has the DDR4-3600 MHZ CL 16-16-16-36 as a 4x8 kit, that has been tested and is compatible.



I've tightened the timings on my 32GB 4x8 4133MHZ Ram to CL 17-17-17-36 @4000MHZ here's some benchmarks.



Here's my timings -




I still have 3 weeks to return the 4133s to new egg and replace them with the 3600.

Here's some additional benchmarks

Please find the bench for the 4x8 4133MHZ below!

CPU CPU Clock Motherboard Chipset Memory CL-RCD-RP-RAS Read Speed
6x Core i7-8700K HT 4700 MHz [ TRIAL VERSION ] Z370 Ext. Dual DDR4-4000 17-17-17-36 CR2 59956 MB/s

CPU CPU Clock Motherboard Chipset Memory CL-RCD-RP-RAS Write Speed
6x Core i7-8700K HT 4700 MHz [ TRIAL VERSION ] Z370 Ext. Dual DDR4-4000 17-17-17-36 CR2 62196 MB/s

CPU CPU Clock Motherboard Chipset Memory CL-RCD-RP-RAS Copy Speed
6x Core i7-8700K HT 4700 MHz [ TRIAL VERSION ] Z370 Ext. Dual DDR4-4000 17-17-17-36 CR2 57995 MB/s

CPU CPU Clock Motherboard Chipset Memory CL-RCD-RP-RAS Latency
Core i7-8700K 4700 MHz [ TRIAL VERSION ] Z370 Ext. Dual DDR4-4000 17-17-17-36 CR2 42.2 ns

Any advice would be greatly appreciated!

Thanks