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ruwolf
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Posts: 8
Registered: ‎06-01-2014
Location: SK
Views: 182
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Ideapad Z50-75(80EC) RAM only half speed?

I have bought 2×8GiB DDR3 SDRAM by recomendation in Hardware mainteinance manual: Samsung M471B1G73DB0-YK0.
But system shows only half speed of them: Smiley Sad

xubuntu@xubuntu:~$ sudo lshw -C memory
  *-firmware                
       description: BIOS
       vendor: LENOVO
       physical id: 0
       version: A4CN29WW (V 1.50)
       date: 07/22/2014
       size: 128KiB
       capacity: 8128KiB
       capabilities: pci upgrade shadowing cdboot bootselect edd int5printscreen int9keyboard int14serial int17printer int10video pc98 acpi usb biosbootspecification netboot
  *-cache:0
       description: L1 cache
       physical id: 2e
       slot: L1 Cache
       size: 256KiB
       capacity: 256KiB
       clock: 1GHz (1.0ns)
       capabilities: pipeline-burst internal write-back unified
       configuration: level=1
  *-cache:1
       description: L2 cache
       physical id: 2f
       slot: L2 Cache
       size: 4MiB
       capacity: 4MiB
       clock: 1GHz (1.0ns)
       capabilities: pipeline-burst internal write-back unified
       configuration: level=2
  *-memory
       description: System Memory
       physical id: 25
       slot: System board or motherboard
       size: 16GiB
     *-bank:0
          description: SODIMM DDR3 Synchronous 800 MHz (1,2 ns)
          product: M471B1G73DB0-YK0
          vendor: Samsung
          physical id: 0
          serial: 378B8EF6
          slot: DIMM 0
          size: 8GiB
          width: 64 bits
          clock: 800MHz (1.2ns)
     *-bank:1
          description: SODIMM DDR3 [empty]
          physical id: 1
     *-bank:2
          description: SODIMM DDR3 Synchronous 800 MHz (1,2 ns)
          product: M471B1G73DB0-YK0
          vendor: Samsung
          physical id: 2
          serial: 378B92AA
          slot: DIMM 0
          size: 8GiB
          width: 64 bits
          clock: 800MHz (1.2ns)
     *-bank:3
          description: SODIMM DDR3 [empty]
          physical id: 3
xubuntu@xubuntu:~$ sudo dmidecode -t memory
# dmidecode 3.0
Getting SMBIOS data from sysfs.
SMBIOS 2.7 present.

Handle 0x0025, DMI type 16, 23 bytes
Physical Memory Array
	Location: System Board Or Motherboard
	Use: System Memory
	Error Correction Type: None
	Maximum Capacity: 32 GB
	Error Information Handle: Not Provided
	Number Of Devices: 2

Handle 0x0026, DMI type 17, 34 bytes
Memory Device
	Array Handle: 0x0025
	Error Information Handle: Not Provided
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 8192 MB
	Form Factor: SODIMM
	Set: 1
	Locator: DIMM 0
	Bank Locator: CHANNEL A
	Type: DDR3
	Type Detail: Synchronous
	Speed: 800 MHz
	Manufacturer: Samsung
	Serial Number: 378B8EF6
	Asset Tag: 0918
	Part Number: M471B1G73DB0-YK0  
	Rank: Unknown
	Configured Clock Speed: 800 MHz

Handle 0x0028, DMI type 17, 34 bytes
Memory Device
	Array Handle: 0x0025
	Error Information Handle: Not Provided
	Total Width: Unknown
	Data Width: Unknown
	Size: No Module Installed
	Form Factor: SODIMM
	Set: 2
	Locator: Not Specified
	Bank Locator: Not Specified
	Type: DDR3
	Type Detail: None
	Speed: Unknown
	Manufacturer: Not Specified
	Serial Number: Not Specified
	Asset Tag: 0918
	Part Number: Not Specified
	Rank: Unknown
	Configured Clock Speed: Unknown

Handle 0x0029, DMI type 17, 34 bytes
Memory Device
	Array Handle: 0x0025
	Error Information Handle: Not Provided
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 8192 MB
	Form Factor: SODIMM
	Set: 3
	Locator: DIMM 0
	Bank Locator: CHANNEL B
	Type: DDR3
	Type Detail: Synchronous
	Speed: 800 MHz
	Manufacturer: Samsung
	Serial Number: 378B92AA
	Asset Tag: 0918
	Part Number: M471B1G73DB0-YK0  
	Rank: Unknown
	Configured Clock Speed: 800 MHz

Handle 0x002B, DMI type 17, 34 bytes
Memory Device
	Array Handle: 0x0025
	Error Information Handle: Not Provided
	Total Width: Unknown
	Data Width: Unknown
	Size: No Module Installed
	Form Factor: SODIMM
	Set: 4
	Locator: Not Specified
	Bank Locator: Not Specified
	Type: DDR3
	Type Detail: None
	Speed: Unknown
	Manufacturer: Not Specified
	Serial Number: Not Specified
	Asset Tag: 0918
	Part Number: Not Specified
	Rank: Unknown
	Configured Clock Speed: Unknown

Please, do not say, it is correct, because it is double-data rate.  As you can see e.g. here, it should be shown as 1600 MHz.

Please, how to solve this issue?

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