How do you check RAM voltage from Linux (can't see that on BIOS)

I have an Elitebook 2570p with 4gigs DDR3L 1600 freq and I just added 4gigs DDR3 (same) freq 1600 because it was pretty cheap.

I found that even though most people say it's OK to mix the two, some did have problems.

But most generally the people with DDR3 who added DDR3L that were asking, I'm in the contrary situation.

I would like to check my the voltage on which runs the components of my Computer, especially the processor and the DDR3L RAM to see whether it is dual voltage, and whether there would be no prob with the DDR3.

Does any one know of a way to check that? my bios (68ISB Ver. F.31) does not give that info (btw a lot of its features are grayed-out)

2

3 Answers

I've used dmidecode.

dmidecode -t [type] (use 5 for voltage and 17 for memory details.)

ie. dmidecode -t 5

Type List

 0 BIOS 1 System 2 Base Board 3 Chassis 4 Processor

---

 5 Memory Controller

---

 6 Memory Module 7 Cache 8 Port Connector 9 System Slots
10 On Board Devices
11 OEM Strings
12 System Configuration Options
13 BIOS Language
14 Group Associations
15 System Event Log
16 Physical Memory Array

---

17 Memory Device

---

18 32-bit Memory Error
19 Memory Array Mapped Address
20 Memory Device Mapped Address
21 Built-in Pointing Device
22 Portable Battery
23 System Reset
24 Hardware Security
25 System Power Controls
26 Voltage Probe
27 Cooling Device
28 Temperature Probe
29 Electrical Current Probe
30 Out-of-band Remote Access
31 Boot Integrity Services
32 System Boot
33 64-bit Memory Error
34 Management Device
35 Management Device Component
36 Management Device Threshold Data
37 Memory Channel
38 IPMI Device
39 Power Supply

Man dmidecode

Some content was taken from here.

P.S : It works with MoBo with DMI zone

5

Use dmidecode with type 17

sudo dmidecode --type 17

Output

# dmidecode 3.1
Getting SMBIOS data from sysfs.
SMBIOS 2.7 present.
Handle 0x0018, DMI type 17, 40 bytes
Memory Device Array Handle: 0x0005 Error Information Handle: Not Provided Total Width: Unknown Data Width: Unknown Size: No Module Installed Form Factor: Other Set: None Locator: Bottom-Slot 1(top) Bank Locator: ChannelA Type: Unknown Type Detail: None Speed: Unknown Manufacturer: Not Specified Serial Number: Not Specified Asset Tag: Not Specified Part Number: Not Specified Rank: Unknown Configured Clock Speed: Unknown Minimum Voltage: Unknown Maximum Voltage: Unknown Configured Voltage: Unknown
Handle 0x0006, DMI type 17, 40 bytes
Memory Device Array Handle: 0x0005 Error Information Handle: Not Provided Total Width: 64 bits Data Width: 64 bits Size: 4096 MB Form Factor: SODIMM Set: None Locator: Bottom-Slot 2(under) Bank Locator: ChannelB Type: DDR3 Type Detail: Synchronous Unbuffered (Unregistered) Speed: 1600 MT/s Manufacturer: Ramaxel Serial Number: 436BC413 Asset Tag: 9876543210 Part Number: RMT3170MN68F9F1600 Rank: 1 Configured Clock Speed: 1600 MT/s Minimum Voltage: Unknown Maximum Voltage: Unknown Configured Voltage: 1.35 V

See bottom of the output, ram voltage is specified there. I have two ram slots, I am using only the second one and configured voltage for that slot is:

Configured Voltage: 1.35 V 

You can download CPU-Z to get voltage info.

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