Asus HERO Z890 8000 Mhz XMP Profile Problem

[Wojti85]

• I have a problem with XMP 8000 Mhz G.Skill RAM profile. I put both RAM modules in A2 and B2 slots, and when I set XMP I or II in BIOS with 8000 Mhz, the PassMark MemTest 86 shows errors and fails the test in dual mode (2 x 24GB RAM). When I tested RAM modules individually, at XMP 8000 Mhz, both memories complete the PassMark MemTest 86 with NO errors in slot A2 (4 passes). Hovever, testing individually RAM in slot B2, at XMP 8000 Mhz, both modules failed the test - the test show errors in the first run regardless using XMP I or II 8000Mhz. When I set RAM to auto setting (no XMP), both RAM modules placed in slot A2 or B2 showed 5600 Mhz. Hovever, when I put RAM modules individually to slot A1 or B1 - the system shows 4000 Mhz on both modules. PassMark MemTest 86 finished four passes with sucesss (no errors) on all slots with both modules tested individually with four passes of test (A2/B2 - 5600 Mhz and A1/B1 - 4000 Mhz). My question is what seems to be a problem - motherboard or RAM? Why both RAM modules are ok in A2 slot with XMP 8000 Mhz, whereas in slot B2, both modules show errors at XMP 8000 Mhz? Why A1/B1 slots run RAM at maximum 4000 Mhz without errors? PS RAM modules are on QVL Asus list, and HERO Z890 motherboard is on QVL G.Skill list. My PSU is Corsair AX1600i - 1600W.

[Silent_Scone]

Hi @Wojti85  Flash to UEFI 1101.

1. Try tuning VCCSA voltage between 1.35v and 1.45v

2. Increase VDD and VDDQ 30-50mV

3. If using a contact frame, remove and use the stock retention mechanism.

4. The correct configuration for 2 DIMMs is slot A2 & B2.

Some info on XMP

[Wojti85]

Hi,

thank you for the reply.

Here is my PC configuration (I'm using latest BIOS 1101):

Motherboard: Asus ROG Maximus Z890 Hero (BIOS: 1101)
Memory: G.SKILL DDR5 48GB (2x24GB) 8000MHz CL40 Trident Z5 RGB XMP (F5-8000J4048F24GX2-TZ5RK)
Processor: Intel Core Ultra 285K
PSU: Corsair AX 1600i - 1600W
Graphic Card: ROG Strix GeForce RTX™ 4070 Ti 12GB GDDR6X OC Edition

I' ve tested once again both memory modules individually on slots A2 and B2 using XMP profile 8000 Mhz. Both memories, tested individually are stable on A2 slot running at 8000 mHz (memtest 86 passed - four passes).

On B2 slot - both modules tested individually fail on XMP - 8000 Mhz. I lowered the XMP speed of each tested module to find out when the modules are stable on B2 Slot. One memory module passed the memtest86 at B2 slot with XMP-7333 Mhz. The second module passed the test on XMP-7433 Mhz. So far I didn't change the voltage which was set on default 1.35V (from XMP profile).

I tried your method and increased VDD and VDDQ to 1.40V (both this values).I didn't find VCCSA (I'm kind of a beginner in the tuning area). The second module increased its stability to correctly pass a memtest on XMP at 7800 MHZ, hovewer failed the test after increasing speed to 8000 Mhz. I tried increasing VDD and VDDQ to 1.435V - less errors on 8000Mhz, but still unstable. Set 1.40V, which also forced me to enable option on my motherboard called "high DRAM Voltage Mode", hovewer still no success on 8000 Mhz/ 1.44V - 1 error on pass 4 - I don't remember number of test. Further increasing VDD and VDDQ voltages to 1.45V still shows errors in metest86. I did't have time to test the other module stability, hovewer it was even less stable on XMP 1.35V in comparison to the medule which I tested all evening, so there is a high chance that 1.45V will not be enough for it too.

Anway what do you think is a problem here - DRAM or motherboard. I'm starting to assume it is a motherboard slot B2 problem. I shows an instability in regards to slot A2 which works ok on default XMP settings. Slot B2 needs much higher Voltage (1.45V vs 1.35V from XMP profile) in order to pass a memtest86. Do you think I should return the motherboard under warranty?

[Wojti85]

Today, I have tested the second memory module at 1.45V (VDD and VDDQ voltages) at slot B2 - the memory passed XMP-7666 Mhz, and failed XMP-7800 Mhz. I don't want to go further with higher voltages beyond 1.45V. Any ideas what seems to be the problem?