Asus Strix Z790-E II and G.Skill Trident Z5 DDR5 8000 - XMP I and II Failure

[Vidarious]

I am not able to boot with both XMP profile I, II or "Tweaked" enabled to utilize the full 8000mhz of my RAM.

The G.Skill 2x24 (48GB) DDR 8000 (F5-8000J4048F24GX2-TZ5RK) is listed as a supported set of DIMM's. They are installed in positions A2 and B2. When the XMP profiles are disabled the system runs smoothly but at a lower RAM speed. When I enable XMP I get Windows failure to boot or blue screens (not stable).

The motherboard is updated to the lastest firmware 0507

I suspect I need to manually assign voltages but I've never done this before. Can someone provide some guidance to get this stable?

Specifications:

- Intel Core i9-14900K
- Lian Li Galahad II Trinity SL-INF 360mm AIO
- ASUS ROG Strix Z790-E II
- G.SKILL Trident Z5 RGB Series 48GB (2 x 24GB) - 8000Mhz
- GeForce RTX 4090 - Asus TUF
- Corsair RM1000x 1000W 80+ Gold ATX
- Samsung 980 Pro 2TB M.2 NVMe PCIe 4.0
- Samsung 990 Pro 4TB (Main)

[Silent_Scone]

Hi Vidarious,

8000MT is still quite tough on 2 DIMM per channel motherboards, hence why 8000MT is the maximum validation for the Strix. Enable XMP II and select DRAM from 7200-7600 to see where the motherboard rules allow system stability. The easiest method of tuning memory stability on Z790 is still the following:

Extreme Tweaker > CPU System Agent
Extreme Tweaker > Advanced Memory Voltages > Memory Controller Voltage
Extreme Tweaker > ADvanced Memory Voltages > IVR Transmitter VDDQ

[Vidarious]

Thank you for the reply. I enabled XMP II and did y-cruncher stress tests at 7200, 7400, 7600, 7800. Only 7200 performed 4 passes without issues. All others (7400/7600/7800) gave errors in the N63 test. I've attached an example screenshot from the 7400Mhz test.

I've done a full memtest with default BIOS (no XMP at all) and it passed with no issues - So I know the RAM is good overall.

Can you give a recommendation of the first setting I should start to play with and a few example values (assuming I'm aiming for 7800Mhz).

[Silent_Scone]

A new beta dropped here. Note this will update the ME Firmware, too.
https://rog-forum.asus.com/t5/intel-700-600-series/raptorlake-resources/m-p/975105/highlight/true#M1...