DEC3840 - RAM SPEED

[NW4FUN]

Hello,

Having run a dmidecode dump, I've noticed that my RAM is running at half its speed. (please see below)
Any ideas why and how to set it to the right speed (2666)?

Code Select Expand

Handle 0x0024, DMI type 17, 40 bytes
Memory Device
Array Handle: 0x0022
Error Information Handle: 0x0027
Total Width: 64 bits
Data Width: 64 bits
Size: 8 GB
Form Factor: DIMM
Set: None
Locator: DIMM 0
Bank Locator: P0 CHANNEL B
Type: DDR4
Type Detail: Synchronous Unbuffered (Unregistered)
Speed: 1333 MT/s
Manufacturer: Unknown
Serial Number: 00000866
Asset Tag: Not Specified
Part Number: TS1GLH64V6B3       
Rank: 1
Configured Memory Speed: 1333 MT/s
Minimum Voltage: 1.2 V
Maximum Voltage: 1.2 V
Configured Voltage: 1.2 V


Thanks!

[BoodahsFever]

It is at the right speed. The speed is doubled. https://en.wikipedia.org/wiki/Double_data_rate

[NW4FUN]

Thanks for your quick reply, but I think that's misleading...
Please find below a dmidecode for a DEC740 showing the expected speed, according to what you're saying that would be 5334M??

Code Select Expand

Handle 0x000C, DMI type 17, 40 bytes
Memory Device
        Array Handle: 0x000B
        Error Information Handle: 0x000E
        Total Width: 64 bits
        Data Width: 64 bits
        Size: 8 GB
        Form Factor: DIMM
        Set: None
        Locator: DIMM 0
        Bank Locator: P0 CHANNEL A
        Type: DDR4
        Type Detail: Synchronous Unbuffered (Unregistered)
        Speed: 2667 MT/s
        Manufacturer: Unknown
        Serial Number: XXXXXXXXX
        Asset Tag: Not Specified
        Part Number: TS1GLH64V6BL
        Rank: 1
        Configured Memory Speed: 2400 MT/s
        Minimum Voltage: 1.2 V
        Maximum Voltage: 1.2 V
        Configured Voltage: 1.2 V

[BoodahsFever]

You should look at the header "Configured Memory Speed: " which reports the... well configured speed and then double that. The header "Speed: displays the highest speed supported by the DIMM probably read from JEDEC SDP. dmidecode just reports what the DIMM advertises.

In this case the DEC740 runs at 4800MT/s which is totally fine and valid.
The first device runs at 2666MT/s slower but not 1333MT/s so no worries mate!

Does this clarify it for you?

[NW4FUN]

Thx bud!