How to choose RAM by frequency?

Question

Iron

Hello.
I want to put a second RAM module on my computer (there is a slot).
If I understand correctly, according to CPU-Z, the Memory Frequency bus frequency is 798.1 MHz (1:6), the frequency of the already existing Max bandwidth PC3-12800 (800 MHz) module.
Do I understand correctly that Memory Frequency 798.1 MHz is the limiting frequency and memory with a higher frequency will not pull? Or is it possible to put a DIMM module DDR3 PC3-12800 Samsung PC3-12800, 4GB, 1.5V, frequency 1600MHz? Nothing, what frequency is 1600 MHz?
Data from CPU-Z:

Chipset
-------------------------------------------------------------------------
Northbridge			Intel Haswell rev. 06
Southbridge			Intel H87 rev. C2
Graphic Interface		PCI-Express
PCI-E Link Width		x16
PCI-E Max Link Width		x16
Memory Type			DDR3
Memory Size			4 GBytes
Channels			Single
Memory Frequency		798.1 MHz (1:6)
CAS# latency (CL)		11.0
RAS# to CAS# delay (tRCD)	11
RAS# Precharge (tRP)		11
Cycle Time (tRAS)		28
Row Refresh Cycle Time (tRFC)	208
Command Rate (CR)		1T
Uncore Frequency		798.1 MHz
MCHBAR I/O Base address		0x0FED10000
MCHBAR I/O Size			19456
MCHBAR registers	

Memory SPD
-------------------------------------------------------------------------
DIMM #				1
  SMBus address		0x52
  Memory type		DDR3
  Module format		UDIMM
  Manufacturer (ID)	Samsung (CE000000000000000000)
  Size			4096 MBytes
  Max bandwidth		PC3-12800 (800 MHz)
  Part number		M378B5173DB0-CK0  
  Serial number		16F5D1C2
  Manufacturing date	Week 28/Year 14
  Number of banks		8
  Nominal Voltage		1.50 Volts