What is the best memory frequency for Z890 Aorus Pro Ice with Ryzen Core Ultra 9 285K?

For the Gigabyte Z890 Aorus Pro Ice motherboard and Intel Core Ultra 9 285K processor pairing, the optimal memory sweet spot is 6800MT/s running at latency timings of CL34. This matches standard gear settings (1:1 memory controller clocks), delivering maximum bandwidth and lowest latency.

Does this setup support CUDIMM DDR5 memory?

Yes, CUDIMMs are physically pin-compatible and will fit. However, on this consumer hardware configuration, the integrated memory controller runs CUDIMMs in "Bypass Mode," disabling the clock driver chip. It operates identically to a standard UDIMM module, so we advise against paying a premium for CUDIMMs.

⚡ Verified System Diagnostics

RAM Specs for Gigabyte Z890 Aorus Pro Ice & Intel Core Ultra 9 285K

Programmatic chipset analysis of CPU IMC thresholds, gear speeds, physical notches, and installation channel priority.

Motherboard Slot Type

DDR5 UDIMM

Sweet Spot Speed

6800MT/s

Sweet Spot Latency

CL34

Channel Mode Priority

Dual A2/B2

Hardware Compatibility Diagnostics

✓ Perfect Slot Notch Fit: Motherboard uses DDR5 slots, matching the processor's native memory controller.

⚠️ Arrow Lake IMC Sweet Spot: LGA1851 platforms are extremely optimized for dual-channel DDR5. Enables stable XMP speeds up to 6800MT/s without gear restrictions.

HARDWARE LOGS TERMINAL

[SUCCESS] physical_key_notch: DDR5 aligned.

[SUCCESS] imc_gear_ratio: optimal 1:1 speed bound verified.

[NOTICE] bios_overclock: EXPO/XMP 1.0 setup required in motherboards.

[SYSTEM] checking motherboard QVL verified tables... done.

SOCKET: LGA1851IMC: DDR5 5600MHz

Interactive RAM Slot Optimizer

Motherboards daisy-chain memory traces. Select how many memory modules you plan to buy, and we will highlight the exact sockets to install them in to prevent bottlenecking.

Motherboard DIMM Slots (A2 & B2 Priority Channels)

DDR5 slots layout

RAM Stick

Best (A2)

RAM Stick

Best (A2)

✓Install your dual sticks in slots A2 and B2 (slots 2 & 4) to ensure dual-channel speeds are active! Installing them next to each other forces single-channel.

⚡ Gigabyte UEFI DualBIOS Dashboard Instructions

All RAM ships running at stock low JEDEC speeds. To activate full rated 6800MT/s overclock speeds, follow these Gigabyte-specific BIOS configuration steps:

1Tap the "Delete" key repeatedly during the splash screen to open the UEFI dashboard.
2Locate the "Tweaker" tab (on some models, click "Advanced Mode" first).
3Find the "Extreme Memory Profile (X.M.P.)" or "Active EXPO" option.
4Change the setting from "Disabled" to "Profile 1".
5Confirm that System Memory Multiplier is set to Auto (matches EXPO speed).
6Press "F10" to save configs and exit.