Memory not running at correct speeds

[fateyukozaki]

At first I had 1x4 GB DDR4-2133 from the laptop's default Samsung Ram Stick.
But then I decided to buy another ram stick from Crucial with the exact timings, voltage, ddr4, etc.
When I installed the new stick I did see up to double increase in gaming performance.
NOTE: I have an AMD APU which feeds A LOT off of dual channel and high speeds.
Now I have 2x4gb DDR4-2133 but when I checked CPU-Z and the Task Manager it said I am only running at 1866MHz when it is suppose to running at 2133MHz.
I also tried going into MSI Afterburner and overclocking the speed but that didn't seem to change it.
My BIOS also does not have an option to mess with the hardware.
So my question is how do I get my RAM to run at its advertised/original speed of 2133MHz?
and something not as important is how do I change the amount of dedicated VRAM on my GPU?
SPECS:
CPU: AMD APU A10-9600P quad core 2.4ghz (3.3 turbo)
GPU: AMD RADEON R5 Integrated 512mb VRAM (up to 4gb?)
MEMORY: Samsung + Crucial 2x4 DDR4-2133 SODIMM
BIOS: InsydeH20 Rev 5.0 F24

 

[brispuss]

The issue (of running at lower than rated frequency) is most likely due to differences in characteristics (apart from frequency, voltage, timings) between the two individual memory modules. It is fortunate that the two modules are working together at all, since quite often two individual memory modules (even the same brand and part number) do not work together at all.

Presumably you have a laptop/notebook. If so, most do not have options in BIOS for adjusting memory parameters, unfortunately.

Two options.

1) Try some other DDR4-2133 individual memory modules until a fully compatible combination is found that allows running memory at 2133 MT/s. This procedure may take some time and could cost more in having to try several memory modules.

2) Get a 2 x 4 GB DDR4-2133 dual channel kit to replace the existing memory. The dual channel kit guarantees that the two modules are compatible with each other and they should run at rated frequency when installed. This is the preferred option as it means less time spent, and maybe less money spent as well.

No comment on VRAM, sorry.