Quick Answer

The best mini-ITX motherboard for the Core Ultra 7 265K is the ASUS ROG STRIX Z890-I GAMING WIFI (~R6,500 at Evetech) — a 14-phase VRM rated at 90 A per phase handles the 265K's OC draw at 5.5 GHz on a 240 mm AIO; Wi-Fi 7 and Intel I226-V 2.5GbE are included; dual M.2 slots (one PCIe 5.0 CPU-direct, one PCIe 4.0) provide fast storage. Arrow Lake's improved efficiency over Raptor Lake makes the 265K one of the best ITX OC CPUs on Z890.

Why the Core Ultra 7 265K Works Well in ITX

Arrow Lake (Core Ultra 200K) improved per-watt efficiency vs. Raptor Lake — the 265K at 5.5 GHz all-core draws approximately 165–180 W, compared to 180–200 W for an i7-14700K at 5.5 GHz. This 10–15% lower heat generation per performance level makes ITX builds more practical:

  • A 240 mm AIO (Corsair H100i, ~R1,800) handles the 265K at 5.5 GHz in a well-ventilated ITX case
  • Cases like the Lian Li A4-H20 (11 L) and NZXT H1 V2 (~R2,200) are viable at this thermal envelope

Z890 ITX Board Specs for the Core Ultra 7 265K

ASUS ROG STRIX Z890-I GAMING WIFI (~R6,500):

  • VRM: 14-phase, 90 A per phase — handles 265K at 5.5–5.6 GHz
  • Wireless: Intel BE200 Wi-Fi 7 (802.11be)
  • Network: Intel I226-V 2.5GbE
  • Storage: 1× PCIe 5.0 M.2 (CPU-direct, top of board) + 1× PCIe 4.0 M.2 (underside)
  • GPU slot: PCIe 5.0 x16
  • Form factor: 170×170 mm

MSI MPG Z890I EDGE WIFI (~R6,000): Alternative ITX Z890 option. 12-phase VRM, Wi-Fi 7, 2.5GbE, two M.2 PCIe 4.0 (no PCIe 5.0 M.2). Slightly less VRM headroom for the 265K at aggressive OC.

ITX Case Compatibility for the Core Ultra 7 265K

  • Lian Li A4-H20: 11 L; 240 mm side AIO; max GPU 305 mm; SFX PSU required
  • NZXT H1 V2: Vertical design; 280 mm front AIO; max GPU 325 mm; SFX PSU required
  • Fractal Design Terra: 10.7 L; 120–240 mm AIO depending on configuration

FAQ

Can the Core Ultra 7 265K be overclocked to 5.5 GHz in a Lian Li A4-H20 ITX case?

Yes — with a 240 mm AIO side-mounted in the Lian Li A4-H20 and the ASUS Z890-I's 14-phase VRM, the 265K achieves 5.5 GHz P-core at 165 W sustained with CPU temperatures under 82°C. The A4-H20's airflow layout (positive pressure with front intake, AIO radiator exhaust) manages 165 W effectively at this OC level. For 5.7 GHz (200 W), the A4-H20 becomes thermally marginal — a more ventilated ITX case is recommended.

What GPU fits in an ITX case with the Core Ultra 7 265K on Z890-I?

The ASUS ROG STRIX Z890-I's PCIe 5.0 x16 GPU slot accommodates any current GPU. The limit is physical case GPU length:

  • Lian Li A4-H20: 305 mm maximum
  • NZXT H1 V2: 325 mm maximum
  • RTX 4070 Super cards: 285–320 mm depending on model — fit most ITX cases
  • RTX 4080 cards: typically 320–340 mm — check specific card dimensions

Is DDR5 required for the Core Ultra 7 265K Z890-I ITX build?

Yes — LGA 1851 is DDR5-only. Budget R1,400 for a 2×16 GB DDR5-6400 CL32 kit. ITX boards have only two DDR5 DIMM slots, so starting with two 16 GB sticks (32 GB total) in dual-channel Gear 1 is the only option — no future slot expansion is possible. Confirm the DDR5 kit appears on the Z890-I's QVL for stable XMP at DDR5-6400; a kit that doesn't train correctly will boot at the slower JEDEC DDR5-4800 until resolved.

TIP

Core Ultra 7 265K in an ITX case, install the 8-pin CPU power cable (EPS12V) before mounting the motherboard into the case — most ITX cases have very limited access to the CPU power connector area after the board is seated, making post-installation cable connections difficult or requiring full disassembly.