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]

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]

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!