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Configured clock speed: 667 MT/s dmidecode

Hey guys, I was messing around today seeing the output of commands... when I noticed something funny.

Why is the configured clock speed at 667??? Why is my RAM reading at max 1333? It should be 1600......
According to the box, my motherboard should be able to handle:
"4 x DIMM, Max. 32GB, DDR3 2133(O.C)/1866/1600/133/1066 MHz, ECC, Non-ECC, un-buffered memory"

Perhaps I have to go into the BIOS settings.... I found this very odd.

Code: [Select]

sudo dmidecode --type 17
# dmidecode 3.1
Getting SMBIOS data from sysfs.
SMBIOS 2.7 present.

Handle 0x002E, DMI type 17, 34 bytes
Memory Device
	Array Handle: 0x002C
	Error Information Handle: Not Provided
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 4096 MB
	Form Factor: DIMM
	Set: None
	Locator: DIMM0
	Bank Locator: BANK0
	Type: DDR3
	Type Detail: Synchronous Unbuffered (Unregistered)
	Speed: 1333 MT/s
	Manufacturer: Undefined    
	Serial Number: 0000000
	Asset Tag: AssetTagNum0
	Part Number: F3-12800CL9-4GBXL 
	Rank: 2
	Configured Clock Speed: 667 MT/s

Handle 0x0030, DMI type 17, 34 bytes
Memory Device
	Array Handle: 0x002C
	Error Information Handle: Not Provided
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 4096 MB
	Form Factor: DIMM
	Set: None
	Locator: DIMM1
	Bank Locator: BANK1
	Type: DDR3
	Type Detail: Synchronous Unbuffered (Unregistered)
	Speed: 1333 MT/s
	Manufacturer: Undefined    
	Serial Number: 0000000
	Asset Tag: AssetTagNum1
	Part Number: F3-12800CL9-4GBXL 
	Rank: 2
	Configured Clock Speed: 667 MT/s

Handle 0x0032, DMI type 17, 34 bytes
Memory Device
	Array Handle: 0x002C
	Error Information Handle: Not Provided
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 4096 MB
	Form Factor: DIMM
	Set: None
	Locator: DIMM2
	Bank Locator: BANK2
	Type: DDR3
	Type Detail: Synchronous Unbuffered (Unregistered)
	Speed: 1333 MT/s
	Manufacturer: Hynix Semicon
	Serial Number: 0180768
	Asset Tag: AssetTagNum2
	Part Number: HMT351U6CFR8C-PB  
	Rank: 2
	Configured Clock Speed: 667 MT/s

Handle 0x0034, DMI type 17, 34 bytes
Memory Device
	Array Handle: 0x002C
	Error Information Handle: Not Provided
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 4096 MB
	Form Factor: DIMM
	Set: None
	Locator: DIMM3
	Bank Locator: BANK3
	Type: DDR3
	Type Detail: Synchronous Unbuffered (Unregistered)
	Speed: 1333 MT/s
	Manufacturer: Hynix Semicon
	Serial Number: 0180768
	Asset Tag: AssetTagNum3
	Part Number: HMT351U6CFR8C-PB  
	Rank: 2
	Configured Clock Speed: 667 MT/s


Re: Configured clock speed: 667 MT/s dmidecode

Reply #1 –
Quote from: kenny_w – on
Hey guys, I was messing around today seeing the output of commands... when I noticed something funny.

Why is the configured clock speed at 667??? Why is my RAM reading at max 1333? It should be 1600......
According to the box, my motherboard should be able to handle:
"4 x DIMM, Max. 32GB, DDR3 2133(O.C)/1866/1600/133/1066 MHz, ECC, Non-ECC, un-buffered memory"

Perhaps I have to go into the BIOS settings.... I found this very odd.

Code: [Select]

sudo dmidecode --type 17
# dmidecode 3.1
Getting SMBIOS data from sysfs.
SMBIOS 2.7 present.

Handle 0x002E, DMI type 17, 34 bytes
Memory Device
	Array Handle: 0x002C
	Error Information Handle: Not Provided
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 4096 MB
	Form Factor: DIMM
	Set: None
	Locator: DIMM0
	Bank Locator: BANK0
	Type: DDR3
	Type Detail: Synchronous Unbuffered (Unregistered)
	Speed: 1333 MT/s
	Manufacturer: Undefined    
	Serial Number: 0000000
	Asset Tag: AssetTagNum0
	Part Number: F3-12800CL9-4GBXL 
	Rank: 2
	Configured Clock Speed: 667 MT/s

Handle 0x0030, DMI type 17, 34 bytes
Memory Device
	Array Handle: 0x002C
	Error Information Handle: Not Provided
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 4096 MB
	Form Factor: DIMM
	Set: None
	Locator: DIMM1
	Bank Locator: BANK1
	Type: DDR3
	Type Detail: Synchronous Unbuffered (Unregistered)
	Speed: 1333 MT/s
	Manufacturer: Undefined    
	Serial Number: 0000000
	Asset Tag: AssetTagNum1
	Part Number: F3-12800CL9-4GBXL 
	Rank: 2
	Configured Clock Speed: 667 MT/s

Handle 0x0032, DMI type 17, 34 bytes
Memory Device
	Array Handle: 0x002C
	Error Information Handle: Not Provided
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 4096 MB
	Form Factor: DIMM
	Set: None
	Locator: DIMM2
	Bank Locator: BANK2
	Type: DDR3
	Type Detail: Synchronous Unbuffered (Unregistered)
	Speed: 1333 MT/s
	Manufacturer: Hynix Semicon
	Serial Number: 0180768
	Asset Tag: AssetTagNum2
	Part Number: HMT351U6CFR8C-PB  
	Rank: 2
	Configured Clock Speed: 667 MT/s

Handle 0x0034, DMI type 17, 34 bytes
Memory Device
	Array Handle: 0x002C
	Error Information Handle: Not Provided
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 4096 MB
	Form Factor: DIMM
	Set: None
	Locator: DIMM3
	Bank Locator: BANK3
	Type: DDR3
	Type Detail: Synchronous Unbuffered (Unregistered)
	Speed: 1333 MT/s
	Manufacturer: Hynix Semicon
	Serial Number: 0180768
	Asset Tag: AssetTagNum3
	Part Number: HMT351U6CFR8C-PB  
	Rank: 2
	Configured Clock Speed: 667 MT/s


Are all of your RAM chips the same brand, model, etc? If not what is the speed of each chip? If even one of them is 1333, then all of them will slow themselves down to match 1333.
Chris Cromer

Re: Configured clock speed: 667 MT/s dmidecode

Reply #2 –
Now I am getting 1600MHz, but configured clock speed at 800.... All I did was mess with the BIOS settings, apparently my desktop's BIOS are very strange.
I want to get the configured clock speed up to 1600, not 800.... Is that not what I would want?

Code: [Select]

sudo dmidecode --type 17
[sudo] password for kz: 
# dmidecode 3.1
Getting SMBIOS data from sysfs.
SMBIOS 2.7 present.

Handle 0x002E, DMI type 17, 34 bytes
Memory Device
	Array Handle: 0x002C
	Error Information Handle: Not Provided
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 4096 MB
	Form Factor: DIMM
	Set: None
	Locator: DIMM0
	Bank Locator: BANK0
	Type: DDR3
	Type Detail: Synchronous Unbuffered (Unregistered)
	Speed: 1600 MT/s
	Manufacturer: Undefined    
	Serial Number: 0000000
	Asset Tag: AssetTagNum0
	Part Number: F3-12800CL9-4GBXL 
	Rank: 2
	Configured Clock Speed: 800 MT/s

Handle 0x0030, DMI type 17, 34 bytes
Memory Device
	Array Handle: 0x002C
	Error Information Handle: Not Provided
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 4096 MB
	Form Factor: DIMM
	Set: None
	Locator: DIMM1
	Bank Locator: BANK1
	Type: DDR3
	Type Detail: Synchronous Unbuffered (Unregistered)
	Speed: 1600 MT/s
	Manufacturer: Undefined    
	Serial Number: 0000000
	Asset Tag: AssetTagNum1
	Part Number: F3-12800CL9-4GBXL 
	Rank: 2
	Configured Clock Speed: 800 MT/s

Handle 0x0032, DMI type 17, 34 bytes
Memory Device
	Array Handle: 0x002C
	Error Information Handle: Not Provided
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 4096 MB
	Form Factor: DIMM
	Set: None
	Locator: DIMM2
	Bank Locator: BANK2
	Type: DDR3
	Type Detail: Synchronous Unbuffered (Unregistered)
	Speed: 1600 MT/s
	Manufacturer: Hynix Semicon
	Serial Number: 0180768
	Asset Tag: AssetTagNum2
	Part Number: HMT351U6CFR8C-PB  
	Rank: 2
	Configured Clock Speed: 800 MT/s

Handle 0x0034, DMI type 17, 34 bytes
Memory Device
	Array Handle: 0x002C
	Error Information Handle: Not Provided
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 4096 MB
	Form Factor: DIMM
	Set: None
	Locator: DIMM3
	Bank Locator: BANK3
	Type: DDR3
	Type Detail: Synchronous Unbuffered (Unregistered)
	Speed: 1600 MT/s
	Manufacturer: Hynix Semicon
	Serial Number: 0180768
	Asset Tag: AssetTagNum3
	Part Number: HMT351U6CFR8C-PB  
	Rank: 2
	Configured Clock Speed: 800 MT/s


Re: Configured clock speed: 667 MT/s dmidecode

Reply #3 –
I keep changing stuff but its still stuck at
Configured Clock Speed: 800 MT/s


Hmmmm.......


I keep changing stuff in the BIOS but its not changed from 800.... hmmm...
Is there a software end to this sort of configuration? Like, perhaps I don't need to be in the BIOS to change this?
Or, should it actually be configured to only 800?

And, its 2 different brands of RAM as you can see from the dmidecode output, 4 chips. All 4 are 1600MHz DDR3.

Re: Configured clock speed: 667 MT/s dmidecode

Reply #4 –
I'm not entirely sure how this hardware is supposed to work.... correct me if I'm wrong in the following statement please.

Ok, so, this is a "dual-channel" RAM thing, where its like.... 1600 MHz per channel, 4 RAM slots but only 2 channels.... so 2 channels means 1600MHz per channel? So 800MHz for 1 chip on 1 channel makes sense?

Correct me if I'm wrong... but I think that's how this works...?

In the case that this is not how it works, then, how do I re-configure the clock speed? Is it something within Linux?

I'm talking about this from dmidecode output:
Configured Clock Speed: 800 MT/s