cyring
AMD 7950x3D Memory controller showing dual-rank DDR5 DIMMs as single-rank with half the capacity
output of corefreq-cli -k -n -B -n -M
Linux:
|- Release [6.8.0-57-generic]
|- Version [#59-Ubuntu SMP PREEMPT_DYNAMIC Sat Mar 15 17:40:59 UTC 2025]
|- Machine [x86_64]
Memory:
|- Total RAM 64956696 KB
|- Shared RAM 6084 KB
|- Free RAM 62851540 KB
|- Buffer RAM 342592 KB
|- Total High 0 KB
|- Free High 0 KB
Clock Source < tsc>
CPU-Freq driver [ amd-pstate-epp]
Governor [ Missing]
CPU-Idle driver [ acpi_idle]
|- Idle Limit [ C3]
|- State POLL C1 C2 C3
|- CPUIDLE ACPI FF ACPI IO ACPI IO
|- Power -1 0 0 0
|- Latency 0 1 18 350
|- Residency 0 2 36 700
[ 0] American Megatrends Inc.
[ 1] 2904
[ 2] 03/04/2025
[ 3] ASUS
[ 4] System Product Name
[ 5] System Version
[ 6] S---e---e---l---m---
[ 7] SKU
[ 8] To be filled by O.E.M.
[ 9] ASUSTeK COMPUTER INC.
[10] ProArt X670E-CREATOR WIFI
[11] Rev 1.xx
[12] 2---1---9---7--
[13] Number Of Devices:4\Maximum Capacity:134217728 kilobytes
[14]
[15] DIMM 1\P0 CHANNEL A
[16]
[17] DIMM 1\P0 CHANNEL B
[18]
[19] Kingston
[20]
[21] Kingston
[22]
[23] KF560C36-32
[24]
[25] KF560C36-32
Zen UMC [14E0]
Controller #0 Dual Channel
Bus Rate 2800 MHz Bus Speed 2800 MHz DDR5 Speed 5600 MT/s
Cha CL RCDr RCDw RP RAS RC RRDs RRDl FAW WTRs WTRl WR clRR clWW
#0 36 38 38 38 96 134 4 6 16 4 20 48 5 15
#1 36 38 38 38 96 134 4 6 16 4 20 48 5 15
CWL RTP RdWr WrRd scWW sdWW ddWW scRR sdRR ddRR drRR drWW drWR drRRD
#0 34 22 18 6 1 9 7 1 7 8 0 0 0 0
#1 34 22 18 6 1 9 7 1 7 8 0 0 0 0
REFI RFC1 RFC2 RFCsb RCPB RPPB BGS:Alt Ban Page CKE CMD GDM ECC
#0 23354 312 192 407 0 0 ON OFF R0W0 0 0 1T ON 0
#1 23354 312 192 407 0 0 ON OFF R0W0 0 0 1T ON 0
MRD:PDA MOD:PDA WRMPR STAG PDM RDDATA WRD WRL RDL XS XP CPDED
#0 40 32 40 32 24 7 0:F:0 24 6 22 34 852 21 14
#1 40 32 40 32 24 7 0:F:0 24 6 22 36 852 21 14
DIMM Geometry for channel #0
Slot Bank Rank Rows Columns Memory Size (MB)
#0
#1 32 1 65536 1024 16384 KF560C36-32
DIMM Geometry for channel #1
Slot Bank Rank Rows Columns Memory Size (MB)
#0
#1 32 1 65536 1024 16384 KF560C36-32
Dumped memory controller config (taken from #511 )
root@pendual:~/Tips/C# # channel 0
./zencli smu 0x50100
[0x00050100] READ(smu) = 0x80000701 (2147485441)
60 56 52 48 44 40 36 32 28 24 20 16 12 08 04 00
0000 0000 0000 0000 0000 0000 0000 0000 1000 0000 0000 0000 0000 0111 0000 0001
root@pendual:~/Tips/C# # channel 1
./zencli smu 0x150100
[0x00150100] READ(smu) = 0x80000701 (2147485441)
60 56 52 48 44 40 36 32 28 24 20 16 12 08 04 00
0000 0000 0000 0000 0000 0000 0000 0000 1000 0000 0000 0000 0000 0111 0000 0001
root@pendual:~/Tips/C# # channel 2
./zencli smu 0x250100
[0x00250100] READ(smu) = 0xffffffff (4294967295)
60 56 52 48 44 40 36 32 28 24 20 16 12 08 04 00
0000 0000 0000 0000 0000 0000 0000 0000 1111 1111 1111 1111 1111 1111 1111 1111
root@pendual:~/Tips/C# # channel 3
./zencli smu 0x350100
[0x00350100] READ(smu) = 0xffffffff (4294967295)
60 56 52 48 44 40 36 32 28 24 20 16 12 08 04 00
0000 0000 0000 0000 0000 0000 0000 0000 1111 1111 1111 1111 1111 1111 1111 1111
root@pendual:~/Tips/C#
another oddity is that lshw -C memory shows the clock as 505MHz
*-memory
description: System Memory
physical id: 13
slot: System board or motherboard
size: 64GiB
*-bank:0
description: [empty]
product: Unknown
vendor: Unknown
physical id: 0
serial: Unknown
slot: DIMM 0
*-bank:1
description: DIMM Synchronous Unbuffered (Unregistered) 4800 MHz (0.2 ns)
product: KF560C36-32
vendor: Kingston
physical id: 1
serial: 3D09639D
slot: DIMM 1
size: 32GiB
width: 64 bits
clock: 505MHz (2.0ns)
*-bank:2
description: [empty]
product: Unknown
vendor: Unknown
physical id: 2
serial: Unknown
slot: DIMM 0
*-bank:3
description: DIMM Synchronous Unbuffered (Unregistered) 4800 MHz (0.2 ns)
product: KF560C36-32
vendor: Kingston
physical id: 3
serial: 2F096366
slot: DIMM 1
size: 32GiB
width: 64 bits
clock: 505MHz (2.0ns)
`dmidecode --type 17` showing correct rank of DIMMs
# dmidecode 3.5
Getting SMBIOS data from sysfs.
SMBIOS 3.6.0 present.
# SMBIOS implementations newer than version 3.5.0 are not
# fully supported by this version of dmidecode.
Handle 0x0016, DMI type 17, 92 bytes
Memory Device
Array Handle: 0x0013
Error Information Handle: 0x0015
Total Width: Unknown
Data Width: Unknown
Size: No Module Installed
Form Factor: Unknown
Set: None
Locator: DIMM 0
Bank Locator: P0 CHANNEL A
Type: Unknown
Type Detail: Unknown
Handle 0x0018, DMI type 17, 92 bytes
Memory Device
Array Handle: 0x0013
Error Information Handle: 0x0017
Total Width: 64 bits
Data Width: 64 bits
Size: 32 GB
Form Factor: DIMM
Set: None
Locator: DIMM 1
Bank Locator: P0 CHANNEL A
Type: DDR5
Type Detail: Synchronous Unbuffered (Unregistered)
Speed: 4800 MT/s
Manufacturer: Kingston
Serial Number: 3D09639D
Asset Tag: Not Specified
Part Number: KF560C36-32
Rank: 2
Configured Memory Speed: 5600 MT/s
Minimum Voltage: 1.1 V
Maximum Voltage: 1.1 V
Configured Voltage: 1.1 V
Memory Technology: DRAM
Memory Operating Mode Capability: Volatile memory
Firmware Version:
Module Manufacturer ID: Bank 2, Hex 0x98
Module Product ID: Unknown
Memory Subsystem Controller Manufacturer ID: Unknown
Memory Subsystem Controller Product ID: Unknown
Non-Volatile Size: None
Volatile Size: 32 GB
Cache Size: None
Logical Size: None
Handle 0x001B, DMI type 17, 92 bytes
Memory Device
Array Handle: 0x0013
Error Information Handle: 0x001A
Total Width: Unknown
Data Width: Unknown
Size: No Module Installed
Form Factor: Unknown
Set: None
Locator: DIMM 0
Bank Locator: P0 CHANNEL B
Type: Unknown
Type Detail: Unknown
Handle 0x001D, DMI type 17, 92 bytes
Memory Device
Array Handle: 0x0013
Error Information Handle: 0x001C
Total Width: 64 bits
Data Width: 64 bits
Size: 32 GB
Form Factor: DIMM
Set: None
Locator: DIMM 1
Bank Locator: P0 CHANNEL B
Type: DDR5
Type Detail: Synchronous Unbuffered (Unregistered)
Speed: 4800 MT/s
Manufacturer: Kingston
Serial Number: 2F096366
Asset Tag: Not Specified
Part Number: KF560C36-32
Rank: 2
Configured Memory Speed: 5600 MT/s
Minimum Voltage: 1.1 V
Maximum Voltage: 1.1 V
Configured Voltage: 1.1 V
Memory Technology: DRAM
Memory Operating Mode Capability: Volatile memory
Firmware Version:
Module Manufacturer ID: Bank 2, Hex 0x98
Module Product ID: Unknown
Memory Subsystem Controller Manufacturer ID: Unknown
Memory Subsystem Controller Product ID: Unknown
Non-Volatile Size: None
Volatile Size: 32 GB
Cache Size: None
Logical Size: None
One more thing that cought my attention was the low memory bandwidth (29895MiB/s)
root@pendual:~# sysbench memory --memory-block-size=1G --memory-total-size=10G run
sysbench 1.0.20 (using system LuaJIT 2.1.0-beta3)
Running the test with following options:
Number of threads: 1
Initializing random number generator from current time
Running memory speed test with the following options:
block size: 1048576KiB
total size: 10240MiB
operation: write
scope: global
Initializing worker threads...
Threads started!
Total operations: 10 ( 29.20 per second)
10240.00 MiB transferred (29895.94 MiB/sec)
General statistics:
total time: 0.3418s
total number of events: 10
Latency (ms):
min: 34.14
avg: 34.16
max: 34.19
95th percentile: 34.33
sum: 341.62
Threads fairness:
events (avg/stddev): 10.0000/0.00
execution time (avg/stddev): 0.3416/0.00
Thank you for your report.
T'il we do get specifications and explanations from manufacturer to decode UMC registers, that issue is going to last.
Zen gen 1 to 3 is giving DDR4 ranks count because reversing a reserved bit had statistically shown its usefulness.
This was for DDR4.
I feel myself fortunate that timings are correctly decoded.
Reversing DDR5 is a matter of using different DIMM topology (banks, ranks, columns, rows); each time, as you did with SMU, dumping registers and guessing bits.
As you are showing, some hexadecimal values like 0xffffffff 0x12345678 and so on, mean nothing here. Zero can however be a meaningful value.
This is what I will do if I was having your hardware and a bunch of DIMMs.
Thank you for the offer tools results you are posting, I can't comment what they are doing.
BIOS and BMC screen parts are better reference, because like CoreFreq, they aim to show the UMC configuration rather than static SPD.
Do you have your processor architecture PPR specification in hands ?
(EDIT: English and link fixed)
I'll provide bios screenshots once I boot into it. I'm currently trying to boot 128GiB, but it's hanging on memory training.
Regarding other tools, I think that they are getting it correct by accident as I do not see a codepath for ddr5 in lshw
I do not have any AMD documentation, but I'm willing to learn and help.
I'll provide bios screenshots once I boot into it. I'm currently trying to boot 128GiB, but it's hanging on memory training.
Regarding other tools, I think that they are getting it correct by accident as I do not see a codepath for ddr5 in lshw
Are you sure those are SMU/UMC registers ? Or SPD data retrieval by i2c ? I wonder when you will BIOS tweak your 128 GB DDR5 if that tool will match ?
I do not have any AMD documentation, but I'm willing to learn and help.
Doc Hub Search for PPR keyword and select your processor family/model. If not, another doc from same generation can make it.
Something went wrong during post and now the mainboard is not booting even with one stick. I was running 2x32GB at 5600 36-38-38-134 1.4v (the kit is rated for 6000MT/s 36-36-38 1.35V on EXPO1, but doesn't boot into these settings) I then added the other 2 sticks but it was stuck on memory training for about an hour so I killed it and after that it didn't post even with a single stick. I'll re-flash bios and start from there.
Are there any particular settings in the bios you'd want me to check if they are reflected in the memory controller view?
Something went wrong during post and now the mainboard is not booting even with one stick. I was running 2x32GB at 5600 36-38-38-134 1.4v (the kit is rated for 6000MT/s 36-36-38 1.35V on EXPO1, but doesn't boot into these settings) I then added the other 2 sticks but it was stuck on memory training for about an hour so I killed it and after that it didn't post even with a single stick. I'll re-flash bios and start from there.
Are there any particular settings in the bios you'd want me to check if they are reflected in the memory controller view?
Nothing in a hurry. Try stabilizing you DRAM first ;)
Fyi, most of my DIMM problems came from insufficient voltage DIMM
okay, after reflashing the BIOS and clearing CMOS, here are the default DRAM timings as reported in BIOS:
transcribed: -- primary -- Tcl: 40 Trcd: 39 Trp: 39 Tras: 77 -- secondary -- Trc: 116 Twr: 72 Refresh Interval: 9347 Trfc1: 708 Trfc2: 384 Trfcsb: 312 Trtp: 18 TrrdL: 12 TrrdS: 8 Tfaw: 32 TwtrL: 24 TwtrS: 6 TrdrdScl: 5 TrdrdSd: 9 Trdrddd: 9 TwrwrScl: 17 TwrwrSc: 1 TwrwrSd: 7 TwrwrDd: 7 Twrrd: 7 Trdwr: 16
root@pendual:~/CoreFreq/build# corefreq-cli -M
Zen UMC [14E0]
Controller #0 Single Channel
Bus Rate 2400 MHz Bus Speed 2395 MHz DDR5 Speed 4790 MT/s
Cha CL RCDr RCDw RP RAS RC RRDs RRDl FAW WTRs WTRl WR clRR clWW
#0 40 39 39 39 77 116 8 12 32 6 24 72 5 17
CWL RTP RdWr WrRd scWW sdWW ddWW scRR sdRR ddRR drRR drWW drWR drRRD
#0 38 18 16 7 1 7 7 1 9 9 0 0 0 0
REFI RFC1 RFC2 RFCsb RCPB RPPB BGS:Alt Ban Page CKE CMD GDM ECC
#0 9347 312 192 312 0 0 ON OFF R0W0 0 0 1T ON 0
MRD:PDA MOD:PDA WRMPR STAG PDM RDDATA WRD WRL RDL XS XP CPDED
#0 34 32 34 32 24 7 0:F:1 28 6 26 34 732 18 12
DIMM Geometry for channel #0
Slot Bank Rank Rows Columns Memory Size (MB)
#0
#1 32 1 65536 1024 16384 KF560C36-32
okay, after reflashing the BIOS and clearing CMOS, here are the default DRAM timings as reported in BIOS:
Thank you. You confirm having two DIMMs but CoreFreq reports only a single one ? No other UMC controller listed ?
First look, tRFC needs a fix: perhaps twice the value. Don't know register rules.
It was tested only with a single DIMM, my bad.
here is output with 2 DIMMs
Zen UMC [14E0]
Controller #0 Dual Channel
Bus Rate 1800 MHz Bus Speed 1800 MHz DDR5 Speed 3600 MT/s
Cha CL RCDr RCDw RP RAS RC RRDs RRDl FAW WTRs WTRl WR clRR clWW
#0 30 29 29 29 58 87 8 9 32 5 18 54 2 11
#1 30 29 29 29 58 87 8 9 32 5 18 54 2 11
CWL RTP RdWr WrRd scWW sdWW ddWW scRR sdRR ddRR drRR drWW drWR drRRD
#0 28 14 15 6 1 7 7 1 8 8 0 0 0 0
#1 28 14 15 6 1 7 7 1 8 8 0 0 0 0
REFI RFC1 RFC2 RFCsb RCPB RPPB BGS:Alt Ban Page CKE CMD GDM ECC
#0 7006 312 192 234 0 0 ON OFF R0W0 0 0 1T ON 0
#1 7006 312 192 234 0 0 ON OFF R0W0 0 0 1T ON 0
MRD:PDA MOD:PDA WRMPR STAG PDM RDDATA WRD WRL RDL XS XP CPDED
#0 26 32 26 32 24 7 0:F:0 18 6 16 32 548 14 9
#1 26 32 26 32 24 7 0:F:0 18 6 16 32 548 14 9
DIMM Geometry for channel #0
Slot Bank Rank Rows Columns Memory Size (MB)
#0
#1 32 1 65536 1024 16384 KF560C36-32
DIMM Geometry for channel #1
Slot Bank Rank Rows Columns Memory Size (MB)
#0
#1 32 1 65536 1024 16384 KF560C36-32
also I am finally starting to get good numbers wrt. bandwidth!
16384.00 MiB transferred (36872.15 MiB/sec)
It was tested only with a single DIMM, my bad.
Not that bad: it has shown CoreFreq can detect a single DIMM.
Hello,
Can you please pull the latest commit of Corefreq and the Memory Controller output ? This should be version 2.0.5
Zen UMC [14E0]
Controller #0 Dual Channel
Bus Rate 2800 MHz Bus Speed 2800 MHz DDR5 Speed 5600 MT/s
Cha CL RCDr RCDw RP RAS RC RRDs RRDl FAW WTRs WTRl WR clRR clWW
#0 36 38 38 38 80 118 8 14 32 7 28 84 7 21
#1 36 38 38 38 80 118 8 14 32 7 28 84 7 21
CWL RTP RdWr WrRd scWW sdWW ddWW scRR sdRR ddRR drRR drWW drWR drRRD
#0 34 21 19 8 1 9 9 1 9 9 0 0 0 0
#1 34 21 20 8 1 9 9 1 9 9 0 0 0 0
REFI RFC1 RFC2 RFCsb RCPB RPPB BGS:Alt Ban Page CKE CMD GDM ECC
#0 10892 312 192 390 0 0 ON OFF R0W0 0 0 1T ON 0
#1 10892 312 192 390 0 0 ON OFF R0W0 0 0 1T ON 0
MRD:PDA MOD:PDA WRMPR STAG PDM RDDATA WRD WRL RDL XS XP CPDED
#0 40 32 40 32 24 7 0:F:0 24 6 22 34 852 21 14
#1 40 32 40 32 24 7 0:F:0 24 6 22 36 852 21 14
DIMM Geometry for channel #0
Slot Bank Rank Rows Columns Memory Size (MB)
#0
#1 32 2 65536 1024 32768 KF560C36-32
DIMM Geometry for channel #1
Slot Bank Rank Rows Columns Memory Size (MB)
#0
#1 32 2 65536 1024 32768 KF560C36-32
working perfectly!
working perfectly!
Great!
-
I found the KF560C36-32 datasheet and it appears we have a match with profile
XMP Profile #2: DDR5-5600 CL36-38-38https://www.kingston.com/datasheets/KF560C36BBEK2-32.pdf -
It took me also a while to understand how to decode the ranks count from the enabled chip select. Unfortunately a regression has been recently encountered on 9950X : output at https://github.com/cyring/CoreFreq/discussions/544#discussioncomment-13255995
-
I noticed there is no page for your
7950x3Din the Wiki/CPU support I will appreciate if you can post various screenshots in different load cases and CLI outputscorefreq-cli -s -n -m -n -k -n -M -n -C 1; or you can create your own public page, and I will add its link into the Wiki.
Thank you