https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Tue, 21 Apr 2026 23:10:36 +0000 Thu, 14 Mar 2019 20:32:14 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=11094 https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ https://forum.asrock.com/forum_posts.asp?TID=11094&PID=61427&title=xmp-ram-profiles#61427 Author: paologab
Subject: 11094
Posted: 14 Mar 2019 at 8:32pm

]]> Thu, 14 Mar 2019 20:32:14 +0000 https://forum.asrock.com/forum_posts.asp?TID=11094&PID=61427&title=xmp-ram-profiles#61427 https://forum.asrock.com/forum_posts.asp?TID=11094&PID=61418&title=xmp-ram-profiles#61418 Author: bjlockie
Subject: 11094
Posted: 14 Mar 2019 at 8:12am

More often than not, information contained in the DMI tables is inaccurate, incomplete or simply wrong.

]]> Thu, 14 Mar 2019 08:12:35 +0000 https://forum.asrock.com/forum_posts.asp?TID=11094&PID=61418&title=xmp-ram-profiles#61418 https://forum.asrock.com/forum_posts.asp?TID=11094&PID=61417&title=xmp-ram-profiles#61417 Author: bjlockie
Subject: 11094
Posted: 14 Mar 2019 at 8:09am

https://linux.die.net/man/8/dmidecode

dmidecode is a tool for dumping a computer's DMI (some say SMBIOS ) table contents in a human-readable format. This table contains a description of the system's hardware components, as well as other useful pieces of information such as serial numbers and BIOS revision. Thanks to this table, you can retrieve this information without having to probe for the actual hardware. While this is a good point in terms of report speed and safeness, this also makes the presented information possibly unreliable.

It got
Configured Clock Speed: 1500 MT/s
right so it should get
Configured Voltage: 1.2 V
right.
Maybe the motherboard doesn't set something it should.
Oh well.]]> Thu, 14 Mar 2019 08:09:39 +0000 https://forum.asrock.com/forum_posts.asp?TID=11094&PID=61417&title=xmp-ram-profiles#61417 https://forum.asrock.com/forum_posts.asp?TID=11094&PID=61416&title=xmp-ram-profiles#61416 Author: paologab
Subject: 11094
Posted: 14 Mar 2019 at 6:48am

you found lazy manufacturers

mine ddr4 @1.35v in bios from dmidecode

Handle 0x0017, DMI type 17, 40 bytes
Memory Device
     Array Handle: 0x000E
     Error Information Handle: 0x0016
     Total Width: 64 bits
     Data Width: 64 bits
     Size: 8192 MB
     Form Factor: DIMM
     Set: None
     Locator: DIMM 1
     Bank Locator: P0 CHANNEL A
     Type: DDR4
     Type Detail: Synchronous Unbuffered (Unregistered)
     Speed: 3200 MT/s
     Manufacturer: Kingston
     Serial Number: --omissis--
     Asset Tag: Not Specified
     Part Number: KHX3200C16D4/8GX    
     Rank: 1
     Configured Memory Speed: 1600 MT/s
     Minimum Voltage: 1.2 V
     Maximum Voltage: 1.2 V
     Configured Voltage: 1.2 V


it seems dmidecode doesn't read the real voltage but the one hard coded in the ram
]]> Thu, 14 Mar 2019 06:48:56 +0000 https://forum.asrock.com/forum_posts.asp?TID=11094&PID=61416&title=xmp-ram-profiles#61416 https://forum.asrock.com/forum_posts.asp?TID=11094&PID=61410&title=xmp-ram-profiles#61410 Author: bjlockie
Subject: 11094
Posted: 14 Mar 2019 at 3:22am

My ddr4 only has one XMP 2.0 Profile and no other options except auto.
I changed the ram profile in the bios to the 3000 one and it says it is 1.35V but dmidecode says:
Handle 0x0015, DMI type 17, 40 bytes
Memory Device
        Array Handle: 0x000C
        Error Information Handle: 0x0014
        Total Width: 64 bits
        Data Width: 64 bits
        Size: 8192 MB
        Form Factor: DIMM
        Set: None
        Locator: DIMM 1
        Bank Locator: P0 CHANNEL A
        Type: DDR4
        Type Detail: Synchronous Unbuffered (Unregistered)
        Speed: 3000 MT/s
        Manufacturer: 04=>
        Serial Number: 00000000
        Asset Tag: Not Specified
        Part Number: F4-3000C16-8GISB
        Rank: 1
        Configured Clock Speed: 1500 MT/s
        Minimum Voltage: 1.2 V
        Maximum Voltage: 1.2 V
        Configured Voltage: 1.2 V

Why would the manufacturer not fill in the "Manufacturer"?
Manufacturer: 04=>

Who is this, the case?
The motherboard can't know what case it is going in?
Handle 0x0003, DMI type 3, 22 bytes
Chassis Information
        Manufacturer: To Be Filled By O.E.M.
        Type: Desktop
        Lock: Not Present
        Version: To Be Filled By O.E.M.
        Serial Number: To Be Filled By O.E.M.
        Asset Tag: To Be Filled By O.E.M.
        Boot-up State: Safe
        Power Supply State: Safe
        Thermal State: Safe
        Security Status: None
        OEM Information: 0x00000000
        Height: Unspecified
        Number Of Power Cords: 1
        Contained Elements: 0
        SKU Number: To be filled by O.E.M.

]]> Thu, 14 Mar 2019 03:22:35 +0000 https://forum.asrock.com/forum_posts.asp?TID=11094&PID=61410&title=xmp-ram-profiles#61410 https://forum.asrock.com/forum_posts.asp?TID=11094&PID=61405&title=xmp-ram-profiles#61405 Author: paologab
Subject: 11094
Posted: 13 Mar 2019 at 9:52pm

Hi
that's the voltage of the base jdec profile.
In dmidecode output you should also have far less then 3000mhz ram clock.

DDR4 has a couple more profile (xmp1 and xmp2) overclocked and overvolted tested by the manufacturer.

If you don't change the ram profile in bios, it defaults to jdec 2400@1.2volts.

When you change the ram profile in bios then it sets the the new frequency and the voltage to 1.35.

For istance, mine are:
JEDEC: DDR4-2400 CL17-17-17 @1.2V
XMP Profile #1: DDR4-3200 CL16-18-18 @1.35V
XMP Profile #2: DDR4-3000 CL15-17-17 @1.35V]]> Wed, 13 Mar 2019 21:52:14 +0000 https://forum.asrock.com/forum_posts.asp?TID=11094&PID=61405&title=xmp-ram-profiles#61405 https://forum.asrock.com/forum_posts.asp?TID=11094&PID=61399&title=xmp-ram-profiles#61399 Author: bjlockie
Subject: 11094
Posted: 13 Mar 2019 at 12:43pm

My DDR4 has an XMP profile to run at 3000MHz at 1.35 volts.

After I boot (linux), dmidecode says the ram is:

Configured Voltage: 1.2 V

Is it a negotiated voltage?]]> Wed, 13 Mar 2019 12:43:46 +0000 https://forum.asrock.com/forum_posts.asp?TID=11094&PID=61399&title=xmp-ram-profiles#61399