Attempting to upgrade a 64GB Trident Z5 Neo to 8000 MHz memory speed
Attempting to upgrade a 64GB Trident Z5 Neo to 8000 MHz memory speed
I looked for DDR5 8000 options but found nothing. So I started asking questions. I recently bought an Asus X870 TUF gaming Plus Wi-Fi board, an AMD 7800X3D, and 64GB of G.Skill memory (upgraded from AM4 5900X). I already have a 1000W PSU, RTX 4080, 360 AIO cooler, and everything I like. I installed 64GB PC6400 DDR5 (four 16GB Corsair Vengeance modules) but wasn’t fully satisfied with the performance. Upgrading to faster memory can boost FPS a bit, so I got the best options available—two packs of G.Skill Trident Z5 Neo (F5-8000J3848H16GX2-TZ5NR). I set them up properly and the PC didn’t work. Restarted and it failed again, this time forcing a BIOS reset. I changed the RAM profile to EXPO1 and restarted. Same result. Won’t post. Pressing the power button to restart or holding the power button to enter BIOS helped. I adjusted some settings from other reliable forums (Asus, PCoverclock.net, etc.) and others said PC8000 speeds are sensitive. They often say more than two RAM modules won’t work well and stability suffers. I put one module in the right slot (slot 2A, first), then a single 16GB module booted into BIOS, and set the speed to PC8000. It started Windows fine. Ran Cyberpunk2077 briefly—no problems. Shut it down and installed the second module (the matching one from the first). The orange Q-light on the motherboard lit up, indicating it didn’t like two modules. I tried booting again, but failed after several BIOS tweaks: EXPO1, EXPO2, EXPO TWEAKED. Even when I manually adjusted timings and voltages, it didn’t work. Eventually, I restarted with all four modules installed, chose EXPO1, and set the RAM speed to 7000. Suddenly, it worked. The system is now stable and runs smoothly. If it works with one stick at PC8000, my confidence is high! I spent a lot on this setup and hope it runs perfectly. It’s been a tough journey, but I’m hopeful now.
Absolutely not. You've already shown one channel can't manage 8000, and adding another DIMM to each channel would significantly increase the electrical load on the signal lines. Most non-registered DDR5 systems have been noted struggling with more than one DIMM per channel.
It's pretty confusing, but I think I get it now. The memory kits are designed for a PC with an 8000 MHz processor and DDR5-8000 16GBx2 configuration, which is listed on the back of the box near the barcode. Thanks for your help, though I'm struggling to figure out how to get the fastest RAM possible that isn't the standard 6000/6400 series. I know it's a bit challenging learning something new, so I'm not giving up—just trying to find a way to run a 64GB system at 8000 MHz without compromising stability. Maybe adjusting the voltage settings or using a different CPU profile could help. Right now I'm settling for 7200 MHz as a compromise.
I noticed a review from HardwareUnboxed mentioning this motherboard started up but didn’t pass the stress test using their 8000MT/s kit. It’s unclear whether that issue is significant, but it’s worth noting.
Start by verifying whether your system is operating in single-chip mode, as this would explain the lack of performance at 8000. For more information and insights, check the article: https://www.techpowerup.com/review/ddr5-...amd-zen-5/. Regarding 8000 with four sticks, you likely face constraints from either your motherboard or CPU. I can't provide exact percentages for all boards, but it's unusual to exceed 7200 with four sticks—especially since AMD only rates memory controllers up to 3600. The achievement of reaching 6000 is more typical than the higher numbers you mentioned. In the roundup referenced, only roughly half of the boards managed 8000, though this may depend on the specific model or CPU/motherboard combination. Timestamps are available if needed.
And that involved two dual-density modules. I’m not sure why others go through this beyond RAM hobbyists who want to test things out or benchmark performance. If you’re working with four dual-density units, you’re essentially already in a losing fight. This was an error, and I hope we can help you understand why. A single 2x32GB setup would have worked far better. With two dual-density modules you can reach up to 128GB, but buying four in 2025 for current systems usually means higher frequencies—something beginners rarely succeed with, especially when you start seeing the results.
In reality, for Ryzen processors you should pair the memory controller directly for optimal speed. By default it runs at 6000MHz. Reducing the CL latency to 30 lets you reach near maximum performance. However, pushing higher frequencies without matching latency usually brings no benefit and can even hurt. Some models with lower latency (around 38) already hit their limits, making it tough to exceed 7000MHz on a budget kit. Higher speeds like 8000MHz below CL40 have been stable once, but it remains extremely challenging for Ryzen chips. The memory controller often struggles under heavy load, making performance drop significantly compared to a standard 6000MHz setup. Running at 5200MHz is officially supported with two sticks and has been tested many times. Reaching 6400MHz is possible with adjustments, but going beyond is difficult and requires a lot of luck. Your CPU is likely limited to around 5200MHz officially, so aiming for higher isn’t guaranteed. These setups are mainly for experimentation rather than serious performance gains. They’re best suited for those willing to take a chance on rare success.
It's commonly mentioned that 6000MT/s CL30 works best with AM5. Even at 8000MT/s, stability may drop unless you use a 7800X3D motherboard, since the CPU usually limits performance. DDR5 presents challenges when trying to run four DIMMs, particularly at high speeds—opt for a 2 DIMM configuration instead. A 4 DIMM setup at 8000MT/s is risky, and pairing two separate 2 DIMM kits adds unnecessary complexity.
Uncertain if you understand the funds spent on the new RAM could have been better used to enhance the 9800X3D's capabilities. RAM typically offers better value compared to price/performance, spending hundreds for only a few frames is unrealistic. Return the new RAM and allocate the money toward genuine performance gains.