AMD Memory Tweak

Read and modify memory timings "on the fly"

AMD Memory Tweak XL Released!

Link

Support

GDDR5 Based AMD GPU's
HBM / HBM2 Based AMD GPU's
Linux
Windows (Beta)

Requirements

One or more AMD Radeon GPU's
amdgpu-pro | ROCM (Verified working on amdgpu-pro 18.30)
Adrenaline (Verified working on v19.4.1/v19.5.*)

Build (Linux)

Prerequisites:

Building:

$ git clone https://github.com/Eliovp/amdmemorytweak
$ cd amdmemorytweak/linux
$ g++ AmdMemTweak.cpp -lpci -lresolv -o amdmemtweak

Build (Windows)

Clone repo
Launch VS Project
Build!

Usage & Instructions

Global command line options

Command	User Input	Extra Info
- -help		Show this output
- -version\|--v		Show version info
- -gpu\|- -i	Comma-Seperated gpu indices	Selected device(s)
- -current		List current twiming values

Command line options: (HBM2)

Command	User Input	Extra Info
- -CL\|- -cl	[value]	Cas Latency
- -RAS\|- -ras	[value]	Active to PRECHARGE command period
- -RCDRD\|- -rcdrd	[value]	Active to READ command delay
- -RCDWR\|- -rcdwr	[value]	Active to WRITE command delay
- -RC\|- -rc	[value]	Active to Active command period
- -RP\|- -rp	[value]	Precharge command period
- -RRDS\|- -rrds	[value]	Active bank A to Active or Single bank Refresh bank B command delay different bank group
- -RRDL\|- -rrdl	[value]	Active bank A to Active or Single Bank Refresh bank B command delay same bank group
- -RTP\|- -rtp	[value]	Read to precharge delay
- -FAW\|- -faw	[value]	Four Active Window
- -CWL\|- -cwl	[value]
- -WTRS\|- -wtrs	[value]	Write to read delay
- -WTRL\|- -wtrl	[value]	tWTR = tWTRL when bank groups is enabled and both WRITE and READ
- -WR\|- -wr	[value]	Write Recovery Time
- -RREFD\|- -rrefd	[value]
- -RDRDDD\|- -rdrddd	[value]
- -RDRDSD\|- -rdrdsd	[value]
- -RDRDSC\|- -rdrdsc	[value]
- -RDRDSCL\|- -rdrdscl	[value]
- -WRWRDD\|- -wrwrdd	[value]
- -WRWRSD\|- -wrwrsd	[value]
- -WRWRSC\|- -wrwrsc	[value]
- -WRWRSCL\|- -wrwrscl	[value]
- -WRRD\|- -wrrd	[value]
- -RDWR\|- -rdwr	[value]
- -REF\|- -ref	[value]	Average Periodic Refresh Interval
- -MRD\|- -mrd	[value]	Mode Register Set command cycle time
- -MOD\|- -mod	[value]	Mode Register Set command update delay
- -XS\|- -xs	[value]	Self refresh exit period
- -XSMRS\|- -xsmrs	[value]
- -PD\|- -pd	[value]	Power down entry to exit time
- -CKSRE\|- -cksre	[value]	Valid CK Clock required after self refresh or power-down entry
- -CKSRX\|- -cksrx	[value]	Valid CK Clock required before self refresh power down exit
- -RFCPB\|- -rfcpb	[value]
- -STAG\|- -stag	[value]
- -XP\|- -xp	[value]
- -CPDED\|- -cpded	[value]
- -CKE\|- -cke	[value]
- -RDDATA\|- -rddata	[value]
- -WRLAT\|- -wrlat	[value]
- -RDLAT\|- -rdlat	[value]
- -WRDATA\|- -wrdata	[value]
- -CKESTAG\|- -ckestag	[value]
- -RFC\|- -rfc	[value]	Auto Refresh Row Cycle Time

Command line options: (HBM)

Command	User Input	Extra Info
- -CKSRE\|- -cksre	[value]
- -CKSRX\|- -cksrx	[value]
- -CKE_PULSE\|- -cke_pulse	[value]
- -CKE\|- -cke	[value]
- -SEQ_IDLE\|- -seq_idle	[value]
- -CL\|- -cl	[value]	CAS to data return latency
- -W2R\|- -w2r	[value]	Write to read turn
- -R2R\|- -r2r	[value]	Read to read time
- -CCDL\|- -ccdl	[value]	Cycles between r/w from bank A to r/w bank B
- -R2W\|- -r2w	[value]	Read to write turn
- -NOPR\|- -nopr	[value]	Extra cycle(s) between successive read bursts
- -NOPW\|- -nopw	[value]	Extra cycle(s) between successive write bursts
- -RCDW\|- -rcdw	[value]	# of cycles from active to write
- -RCDWA\|- -rcdwa	[value]	# of cycles from active to write with auto-precharge
- -RCDR\|- -rcdr	[value]	# of cycles from active to read
- -RCDRA\|- -rcdra	[value]	# of cycles from active to read with auto-precharge
- -RRD\|- -rrd	[value]	# of cycles from active bank a to active bank b
- -RC\|- -rc	[value]	# of cycles from active to active/auto refresh
- -MRD\|- -mrd	[value]
- -RRDL\|- -rrdl	[value]
- -RFC\|- -rfc	[value]	Auto-refresh command period
- -TRP\|- -trp	[value]	Precharge command period
- -RP_WRA\|- -rp_wra	[value]	From write with auto-precharge to active
- -RP_RDA\|- -rp_rda	[value]	From read with auto-precharge to active
- -WDATATR\|- -wdatatr	[value]
- -T32AW\|- -t32aw	[value]
- -CRCWL\|- -crcwl	[value]
- -CRCRL\|- -crcrl	[value]
- -FAW\|- -faw	[value]
- -PA2WDATA\|- -pa2wdata	[value]
- -PA2RDATA\|- -pa2rdata	[value]
- -REF\|- -ref	[value]	Refresh Rate
- -ENB\|- -enb	[value]
- -CNT\|- -cnt	[value]
- -TRC\|- -trc	[value]

Command line options: (GDDR5)

Command	User Input	Extra Info
- -CKSRE\|- -cksre	[value]
- -CKSRX\|- -cksrx	[value]
- -CKE_PULSE\|- -cke_pulse	[value]
- -CKE\|- -cke	[value]
- -SEQ_IDLE\|- -seq_idle	[value]
- -CL\|- -cl	[value]	CAS to data return latency
- -W2R\|- -w2r	[value]	Write to read turn
- -R2R\|- -r2r	[value]	Read to read time
- -CCDL\|- -ccdl	[value]	Cycles between r/w from bank A to r/w bank B
- -R2W\|- -r2w	[value]	Read to write turn
- -NOPR\|- -nopr	[value]	Extra cycle(s) between successive read bursts
- -NOPW\|- -nopw	[value]	Extra cycle(s) between successive write bursts
- -RCDW\|- -rcdw	[value]	# of cycles from active to write
- -RCDWA\|- -rcdwa	[value]	# of cycles from active to write with auto-precharge
- -RCDR\|- -rcdr	[value]	# of cycles from active to read
- -RCDRA\|- -rcdra	[value]	# of cycles from active to read with auto-precharge
- -RRD\|- -rrd	[value]	# of cycles from active bank a to active bank b
- -RC\|- -rc	[value]	# of cycles from active to active/auto refresh
- -RFC\|- -rfc	[value]	Auto-refresh command period
- -TRP\|- -trp	[value]	Precharge command period
- -RP_WRA\|- -rp_wra	[value]	From write with auto-precharge to active
- -RP_RDA\|- -rp_rda	[value]	From read with auto-precharge to active
- -WDATATR\|- -wdatatr	[value]
- -T32AW\|- -t32aw	[value]
- -CRCWL\|- -crcwl	[value]
- -CRCRL\|- -crcrl	[value]
- -FAW\|- -faw	[value]
- -PA2WDATA\|- -pa2wdata	[value]
- -PA2RDATA\|- -pa2rdata	[value]
- -RAS\|- -ras	[value]
- -ACTRD\|- -actrd	[value]
- -ACTWR\|- -actwr	[value]
- -RASMACTRD\|- -rasmactrd	[value]
- -RASMACWTR\|- -rasmacwtr	[value]
- -RAS2RAS\|- -ras2ras	[value]
- -RP\|- -rp	[value]
- -WRPLUSRP\|- -wrplusrp	[value]
- -BUS_TURN\|- -bus_turn	[value]
- -REF\|- -ref	[value]	Refresh Rate

Example Usage (Linux):

$ sudo ./amdmemtool --i 0,3,5 --faw 100 --RFC 100

Example Usage (Windows):

C:\Users\You\Desktop\WinAMDTweak.exe --i 1,2,4 --rfc 100 --RC 100

(These are just examples! Don't try these at home! :p)

Make sure to run the program first with parameter --current to see what the current values are. Current values may change based on state of the GPU, in other words, make sure the GPU is under load when running --current. HBM2 Based GPU's do not need to be under load to apply timing changes. It is often better to apply new timings before starting a benchmark/mining tool.

Hints: Some timings are stability timings, lowering these will lower stability. Such as tRC. Some timings might require a higher value for performance to improve. Such as tREF. Some timings have a min/max value, going outside this range will result into it defaulting back to original value. Such as tCL Some timings are dynamic, they change based on the vbios values and active clocks. Dram timings. ...

Row Access Timings tRC, tRAS, tRCDRD, tRCDWR, tRRDL, tRRDS, tFAW, tRTP Column Access Timings tCCDL, tCCDS, tCCDR, tWTRL, tWTRS, tRTW, Refresh Timings tRFC, tRFCSB, tRREFD, tREFI

Some extra info

Still not all possible timings have been exposed. However, it's not such a big deal to add more of them in the tool. The ones available are more or like the most important ones.

Some users have reported very nice results already, please continue to contribute to these results. Example

Have fun!

Cheers

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