No detecta mi ram en el segundo slot

tengo entendido que si las detecta
sudo inxi -m

Memory:
  RAM: total: 3.29 GiB used: 1.49 GiB (45.2%) 
  Array-1: capacity: 8 GiB slots: 2 EC: None 
  Device-1: DIMM 0 size: 4 GiB speed: 1334 MT/s 
  Device-2: DIMM 1 size: 4 GiB speed: 1600 MT/s 

sudo dmidecode --type Memory

# dmidecode 3.2
Getting SMBIOS data from sysfs.
SMBIOS 2.7 present.

Handle 0x0020, DMI type 16, 23 bytes
Physical Memory Array
	Location: System Board Or Motherboard
	Use: System Memory
	Error Correction Type: None
	Maximum Capacity: 8 GB
	Error Information Handle: 0x0029
	Number Of Devices: 2

Handle 0x0021, DMI type 17, 34 bytes
Memory Device
	Array Handle: 0x0020
	Error Information Handle: 0x0023
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 4096 MB
	Form Factor: SODIMM
	Set: None
	Locator: DIMM 0
	Bank Locator: CHANNEL A
	Type: DDR3
	Type Detail: Synchronous Unbuffered (Unregistered)
	Speed: 1334 MT/s
	Manufacturer: Not Specified
	Serial Number: 5B29D950
	Asset Tag: Asset Tag: 
	Part Number: HMT351S6BFR8C-H9  
	Rank: 2
	Configured Memory Speed: 1334 MT/s

Handle 0x0022, DMI type 6, 12 bytes
Memory Module Information
	Socket Designation: DIMM 0
	Bank Connections: None
	Current Speed: Unknown
	Type: DIMM
	Installed Size: 4096 MB (Single-bank Connection)
	Enabled Size: 4096 MB (Single-bank Connection)
	Error Status: OK

Handle 0x0025, DMI type 17, 34 bytes
Memory Device
	Array Handle: 0x0020
	Error Information Handle: 0x0027
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 4096 MB
	Form Factor: SODIMM
	Set: None
	Locator: DIMM 1
	Bank Locator: CHANNEL A
	Type: DDR3
	Type Detail: Synchronous Unbuffered (Unregistered)
	Speed: 1600 MT/s
	Manufacturer: Samsung
	Serial Number: E150025F
	Asset Tag: Asset Tag: 
	Part Number: M471B5273CH0-YK0  
	Rank: 2
	Configured Memory Speed: 1334 MT/s

Handle 0x0026, DMI type 6, 12 bytes
Memory Module Information
	Socket Designation: DIMM 1
	Bank Connections: None
	Current Speed: Unknown
	Type: DIMM
	Installed Size: 4096 MB (Single-bank Connection)
	Enabled Size: 4096 MB (Single-bank Connection)
	Error Status: OK

Handle 0x002B, DMI type 5, 20 bytes
Memory Controller Information
	Error Detecting Method: None
	Error Correcting Capabilities:
		None
	Supported Interleave: One-way Interleave
	Current Interleave: One-way Interleave
	Maximum Memory Module Size: 8192 MB
	Maximum Total Memory Size: 16384 MB
	Supported Speeds:
		Other
		Unknown
		70 ns
		60 ns
		50 ns
	Supported Memory Types:
		Other
		Unknown
		Standard
		FPM
		SIMM
		Burst EDO
	Memory Module Voltage: 3.3 V
	Associated Memory Slots: 2
		0x0022
		0x0026
	Enabled Error Correcting Capabilities:
		None
		Single-bit Error Correcting
		Double-bit Error Correcting
		Error Scrubbing