Thought I’d share my timings/voltages for anyone interested in chasing low CAS latency on AM5 with similar gear. This post is mostly for overclockers but I’ll probably repost this in subs relevant to the hardware – g.skill, ASRock, and Noctua. Also, I’m not claiming this to be 100% stable yet but it passed 5 cycles (>3hrs) of TM5 absolut with 0 errors along with error free y-cruncher VT3 runs. Average RAM temps for the 3hr TM5 absolut run was 41 degrees with a max of 43.
Gear:
– CPU: 9800x3d (asynch blck at 101 + per core curve optimizer)
– vsoc: 1.225v
– RAM: g.skill F5-6000J2636G32GX2-TZ5NRW (64GB dual rank 6000 cl26 at 1.4v expo kit)
– CAS: 24
– fclk set to 2200, actual fclk from bclk = 2222
– mclk set to 3000, actual from bclk = 3030
– mem vdd: 1.56v
– nitro: 1-2-0, 1T, gdm disabled
– Mobo: ASRock x870e Taichi OCF
– replaced ASRock RAM fan with Noctua NF-A6x15
I previously had the Taichi Lite Mobo and with it could hit 6200 cl26 but with the Taichi OCF I couldn’t get it to boot at 6200 with loose expo timings. According to Google AI, the 2 DIMM OCF board is better at hitting high speed 2:1 RAM setups while the 4 DIMM daisy chain setup of the Taichi Lite creates some sort of ripple buffer that allowed it to boot at lower speeds with tighter timings (this bit was beyond me 🤷♂️). So since I was hitting a wall at 6200 cl26 on the OCF board I decided to try something else, 6000 cl24. This was surprisingly easy and only took a relatively small bump in RAM voltage.
On my Taichi Lite mobo I had a RAM fan I bought off Amazon that was better than nothing but I don’t think it could’ve kept temps at 41 degrees during TM5 absolut like the fan on the Taichi OCF did. The problem was the fan on the OCF sounded like a screaming eagle when it ramped up so I swapped it for a 60mm Noctua fan and it’s been smooth sailing since then. The Noctua fan was wider than the one that came with the OCF Mobo so to be able to screw it to the mount I had to chisel away a bit of the outer frame of the Noctua fan.
Sorry this post turned out way longer than I anticipated but hopefully somebody finds it useful or has helpful info to share with me!