Hi,
i tried to find here some explanation or documents which help me understanding the "rules" or "basics" for the timings of DDR4 RAM especially B-Die G.Skill.
What i found out until now is the following:
primary Timings
tCL = ...
tRCD = ...
tRP = tRCD
tRAS = tRCD*2 or tRCD+tCL
CR = 2
secondary Timings
tWR = 10 bis 16
tRFC = 10 * tRAS
tRRD_S = 4 to 6
tRRD_L = tRRD_S or tRRD_S +2
tWTR_S = auto (depends on tWRRD_sg & dg)
tWTR_L = auto (depends on tWRRD_sg & dg)
tRTP = tWR / 2 (is not working for me, i use little bit below tWR)
tFAW = tRRD_S * 4
tCWL = tRCD - 3
tertiary Timings
tREFI = 65535 Spec says 7.8*(4133/2)=16119
tCKE = 4 to 8
tRDRD_sg = 6
tRDRD_dg = 4 (important for reading bandwith)
tRDRD_dr = only needed for dual ranked DIMMs
tRDRD_dd = 6
tWRWR_sg = 6
tWRWR_dg = 4 (important for writing bandwith)
tWRWR_dr = only needed for dual ranked DIMMs
tWRWR_dd = 6
tRDWR_sg = 12 to 15
tRDWR_dg = 12 to 15
tRDWR_dr = only needed for dual ranked DIMMs
tRDWR_dd = 13 to 16 ( tRDWR_dg + 1) (tRDWR some say it is important for AVX commandos, if you go lower it can heat the up the CPU more and more)
tWRRD_sg = 29 to 32 ( tWRRD_dg + 5)
tWRRD_dg = 24 to 27 ( tWTR_S +20 )
tWRRD_dr = only needed for dual ranked DIMMs
tWRRD_dd = 4 to 6 (tWRRD some say if you go too low you can reset/delete your BIOS)
IOL, RTL i let them on auto
So please can someone say something about the timings, about "rules" or if you have links to documents which help understanding i would be glad.
Thx in advance
hq
i tried to find here some explanation or documents which help me understanding the "rules" or "basics" for the timings of DDR4 RAM especially B-Die G.Skill.
What i found out until now is the following:
primary Timings
tCL = ...
tRCD = ...
tRP = tRCD
tRAS = tRCD*2 or tRCD+tCL
CR = 2
secondary Timings
tWR = 10 bis 16
tRFC = 10 * tRAS
tRRD_S = 4 to 6
tRRD_L = tRRD_S or tRRD_S +2
tWTR_S = auto (depends on tWRRD_sg & dg)
tWTR_L = auto (depends on tWRRD_sg & dg)
tRTP = tWR / 2 (is not working for me, i use little bit below tWR)
tFAW = tRRD_S * 4
tCWL = tRCD - 3
tertiary Timings
tREFI = 65535 Spec says 7.8*(4133/2)=16119
tCKE = 4 to 8
tRDRD_sg = 6
tRDRD_dg = 4 (important for reading bandwith)
tRDRD_dr = only needed for dual ranked DIMMs
tRDRD_dd = 6
tWRWR_sg = 6
tWRWR_dg = 4 (important for writing bandwith)
tWRWR_dr = only needed for dual ranked DIMMs
tWRWR_dd = 6
tRDWR_sg = 12 to 15
tRDWR_dg = 12 to 15
tRDWR_dr = only needed for dual ranked DIMMs
tRDWR_dd = 13 to 16 ( tRDWR_dg + 1) (tRDWR some say it is important for AVX commandos, if you go lower it can heat the up the CPU more and more)
tWRRD_sg = 29 to 32 ( tWRRD_dg + 5)
tWRRD_dg = 24 to 27 ( tWTR_S +20 )
tWRRD_dr = only needed for dual ranked DIMMs
tWRRD_dd = 4 to 6 (tWRRD some say if you go too low you can reset/delete your BIOS)
IOL, RTL i let them on auto
So please can someone say something about the timings, about "rules" or if you have links to documents which help understanding i would be glad.
Thx in advance
hq