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2x16GB DDR5-8000 CL38 // Ryzen 7 9700X // MSI X870 Tomahawk
🕑 Added 2024-11-24 14:02:46 +0000 UTCTested on BIOS 1.A1A
memory kit used: G.skill TridentZ Neo 8000 CL38 1.45V EXPO
F5-8000J3848H16GX2-TZ5NR
Hynix 16Gb A-die
tests passed:
Prime 95 Large FFT: 10+ hours
Karhu: 16+ hours
Ycruncher VT3: 3+ hours
MCLK: 4000
UCLK: 2000
FCLK: 2000 synced
VSOC: 1.05V
VDDIO: 1.45V
VDDP: 1.05V
MVDD: 1.45V (fan somewhat optional)
MVDDQ: 1.45V
tCL: 34
tRCDWR: 16
tRCD: 46
tRP: 38
tRAS: 48
tRC: 86
tWR: 48
tREFI: 65535 (max SPD HUB temp in testing: 39C)
tRFC1: 480
tRTP: 12
tRRDL: 8
tRRDS: 8
tFAW: 32
tWTRL: 16
tWTRS: 2
tRDRDSCL: 8
tRDRDSC: 1
tWRWRSCL: 8
tWRWRSC: 1
tWRRD: 4
tRDWR: 18
Notes: The EXPO on this mem kit with this CPU and BIOS did just work. So all I did was tighten the timings. I'll be testing my other A-die kits in the future in order to see if the mem kit or BIOS version are the main reason for this being so easy to set up because historically I've not had much success with getting DDR5-8000 to work with 16Gb A-die.
