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XMP ram profiles |
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bjlockie 
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 Topic: XMP ram profilesPosted: 13 Mar 2019 at 12:43pm |
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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? |
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ASRock B450M Pro4
16 GB DDR4, 500 watt PS, AMD Ryzen-5 5600, NVidia GTX-1050, 5.70 BIOS |
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paologab
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Joined: 21 Nov 2018 Location: Milan Status: Offline Points: 112 |
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Posted: 13 Mar 2019 at 9:52pm |
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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 |
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AMD Ryzen 7 2700X w/Wraith prism
x470 Taichi bios 3.50 16gb HX432C16PB3K2/16 (hynix H5AN8G8NCJR-UHC) M.2 970 EVO, SATA SSD, 2 SATA HDD AMD Radeon RX 580 8G OC Linux Kernel 5.4 Manjaro Stable XFCE |
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bjlockie
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Joined: 17 Nov 2015 Status: Offline Points: 1394 |
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Posted: 14 Mar 2019 at 3:22am |
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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. |
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ASRock B450M Pro4
16 GB DDR4, 500 watt PS, AMD Ryzen-5 5600, NVidia GTX-1050, 5.70 BIOS |
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paologab
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Joined: 21 Nov 2018 Location: Milan Status: Offline Points: 112 |
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Posted: 14 Mar 2019 at 6:48am |
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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 |
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AMD Ryzen 7 2700X w/Wraith prism
x470 Taichi bios 3.50 16gb HX432C16PB3K2/16 (hynix H5AN8G8NCJR-UHC) M.2 970 EVO, SATA SSD, 2 SATA HDD AMD Radeon RX 580 8G OC Linux Kernel 5.4 Manjaro Stable XFCE |
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bjlockie
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Joined: 17 Nov 2015 Status: Offline Points: 1394 |
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Posted: 14 Mar 2019 at 8:09am |
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https://linux.die.net/man/8/dmidecode
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. |
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ASRock B450M Pro4
16 GB DDR4, 500 watt PS, AMD Ryzen-5 5600, NVidia GTX-1050, 5.70 BIOS |
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bjlockie
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Joined: 17 Nov 2015 Status: Offline Points: 1394 |
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Posted: 14 Mar 2019 at 8:12am |
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ASRock B450M Pro4
16 GB DDR4, 500 watt PS, AMD Ryzen-5 5600, NVidia GTX-1050, 5.70 BIOS |
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paologab
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Posted: 14 Mar 2019 at 8:32pm |
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AMD Ryzen 7 2700X w/Wraith prism
x470 Taichi bios 3.50 16gb HX432C16PB3K2/16 (hynix H5AN8G8NCJR-UHC) M.2 970 EVO, SATA SSD, 2 SATA HDD AMD Radeon RX 580 8G OC Linux Kernel 5.4 Manjaro Stable XFCE |
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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.