PHVM_BR

VDD 1275-1300 and VDDQ 1225-1250. You might need to increase tRCD/tRP to 40. If you can't boot with those values, it's best to forget about it and leave tCL at 34... The Control Center doesn't influence XTU. Did you disable undervolt protection in the BIOS? Disable Core Isolation in Windows and virtualization features in the BIOS. Your CPU score in Time Spy should be higher. You can exceed 22k with that 6400 MT/s configuration. With a well-tuned 7000 MT/s, you can reach more than 23k. Are you using a water cooler or cooling pad? Did you overclock the NGU and D2D? Reducing the CPU voltage obviously helps.

Suggestions: Lower tCWL to 32; Return tRTP to 12; if unstable, leave it at 16; Return tWR to 48; if unstable, increase it slightly; I believe you can achieve tCL 32, but you'll need to increase the voltage... if you reach 32, lower tCWL to 30; You might also be able to lower tCCD_L to 8 or 10 and tWTR_L to something between 16 and 20; Having verified these points, there is nothing more to be done in 6400.

I bought it on Aliexpress. Using the memory's thermal enclosure, the maximum allowed thickness is 1.5 mm, and this also prevents the use of a heatsink on the other memory module due to the fixed thermal pad. If you don't use the case, I believe it's possible to use a 3 mm thick heatsink.

- Lowest latency I managed: - Highest bandwidth I obtained (almost saturating the theoretical maximum of 102.4GB/s at 6400MT/s). Stable only up to ~75ºC:

In games, based on the limited data I've recorded, the modules operate at 55-65°C. In 1 hour of OCCT testing with CPU + Memory, the temperature stabilizes at ~84°C (the module in contact with the thermal pad of the memory's thermal enclosure) and ~79°C on the other module with a 1.5mm thick copper/graphene heatsink. Before using this heatsink, this module stabilized at 89°C in the same 1-hour OCCT test. I'm considering buying 3mm thick heatsinks and removing the thermal enclosure from the memory. The temperatures will likely be lower. I also don't have a water cooler, but I use an IETS GT600 which should make a significant difference. If stability problems occur when your memory reaches 85°C, try decreasing the tREFI and/or increasing the tRFC. For M-die, the tRFC should naturally be higher than in A-die.

New scores: https://www.3dmark.com/spy/63490027 https://www.3dmark.com/sn/13862641

I have two sets of memory, both 2x32GB dual-rank, so it's quite different (and demanding) compared to your kit. If your memory is Hynix A-die, you can probably lower the tRFC significantly (384-448). Try making it the same as tRFC2. tRAS also, you can probably reduce it quite a bit (42-54). You should be able to achieve 7200MT/s by increasing the VDD to 1300/1325. If you can't, it may be necessary to loosen the tRCD/tRP slightly to 44. For everything else, it's difficult for me to comment... I went back to using the original memory, Adata 5600MT/s CL46, because its adjustment limit is almost identical to the other set I have (Fury Impact 5600MT/s CL40), both are Hynix A-die. With Fury I can get some slightly tighter subtimings, but without a relevant difference in performance. Perhaps 200 to 300 more points in the CPU score on TS. Without access to manually adjusting SA and VDD2, I can't go any further... My tuning is: RATIO 192 tCL 36 tRCD/tRP 39 tRAS 54 tCWL 34 (32 with Fury) tFAW 16 tREFI 24576 tRFC 400 tRRD 0 tRTP 20 tWR 72 tWTR 0 tRFCpb 320 tRFC2 400 tRFC4 0 tRRD_L 8 tRRD_S 4 tWTR_L 24 tCCD_L 14 (12 with Fury) tCCD_L_WR 64 (56 with Fury) tWTR_S 7 NMode 2 VDD 1300 VDDQ 1250 VPP 1800

https://www.3dmark.com/sn/13390291 https://www.3dmark.com/spy/63122281

Perhaps because tRCD/tRP = 40 is too tight for 7200MT/s.

A good settings for your memory, I believe without much difficulty, would be 7200 CL36 with: tRCD/tRP = 42 or 44 tRAS = 60 to 84 VDD = 1275 to 1325 VDDQ = 1225 to 1275 You can also set the tREFI to 16-32k. Once you find stability, you can adjust the subtimings by researching and understanding each step. AI can help!

Are all the timings from the XMP profile? Use these timings as a starting point to achieve a higher frequency. Start at 7200MT/s (216), for this frequency with the loose timings of the XMP profile it should be possible with VDD 1200-1250. This is the first time I've seen a VDDQ higher than VDD on these Arrow Lake HX systems. Usually, the VDDQ is set lower, for example, 1250/1200 for VDD/VDDQ. You probably don't need VDDQ = 1225 with VDD = 1150. Then adjust the timings, starting with the primary ones (tCL, tRCD/tRP, tRAS). If you tighten the primary timings too much at 7200 you will need to increase VDD/VDDQ. I would keep VPP at the default (1800). After you achieve a good setup with reasonable voltages to avoid overheating, start adjusting the sub-timings, which is the fine-tuning that makes a big difference in gaming performance.

Is it running within the parameters of the standard XMP profile? 6400MT/s CL38-40-40-80 with VDD/VDDQ at 1350?

I didn't take thermal throttling into account... These undervoltage numbers are perfectly stable for me, but under heavy, longer-duration loads, the clock speeds decrease due to temperatures, and the stable values for 5.2/4.6GHz become unstable depending on the drop. The solution is to reduce the undervoltage or ensure that the system does not suffer from thermal throttling.

My undervolt, stable in any situation, is: -55mV for the P-cores (limited to 5.2GHz) -70mV for the E-cores (4.6GHz) I decided to test the individual undervolt of each P-core and each of the 4 E-core clusters using XTU. I achieved a considerable gain in CPU efficiency with undervolting per core/cluster: P-core 0 = -75mV P-core 1 = -55mV P-core 2 = -55mV P-core 3 = -70mV P-core 4 = -70mV P-core 5 = -65mV P-core 6 = -65mV P-core 7 = -70mV E-cores 0 = -75mV E-cores 1 = -70mV E-cores 2 = -85mV E-cores 3 = -80mV Since XTU does not provide the V/F curve for this CPU, it is still necessary to compensate for the undervoltage at the first two points of the curve (800MHz and 2000MHz) in the BIOS to prevent instability in idle mode. Currently, on CBR23 it runs with all cores locked at 5.2/4.6GHz, without thermal throttling, scoring around 42500 and consuming ~195W.

BIOS Advanced (D2D / NGU) and XTU (NGU / Ring).