A dual-GPU AI workstation is a different beast from a gaming PC, two power-hungry cards plus a high-core CPU can push well past what any single gaming PSU handles. The 1200W question is really about whether even that is enough for your specific cards.

Quick Answer

A 1200W PSU is the sensible minimum for a dual-GPU AI workstation, but whether it is enough depends on the cards, two RTX 5090-class GPUs alone can draw over 1100W, so a 1200W unit is marginal and a 1500-1600W unit is safer. For dual mid-range or dual professional cards with lower draw, 1200W works; for dual flagships, size up. Always choose 80 Plus Platinum, ATX 3.1, with the right connectors.

Sizing power for a dual-GPU AI build

Add the cards' peak draw plus the CPU and the rest. Two RTX 5090s can exceed 1100W between them, which leaves almost no headroom on a 1200W unit, risky given transient spikes, so 1500-1600W is the safer choice for dual flagships. Two lower-power professional or mid-range cards may total well under 1000W, making 1200W comfortable. A high-core CPU like a Threadripper or Ryzen 9 adds meaningfully to the total under heavy AI load, so include it in the maths.

Building a stable AI workstation

For AI workloads the system runs near full load for long stretches, so prioritise an 80 Plus Platinum unit for efficiency and a quality pump of cool air, heat is constant, not bursty. Use a PSU with enough native 12V-2x6 and PCIe connectors for both cards, avoid daisy-chaining where possible. House it in a high-airflow full-tower case so both GPUs breathe. Confirm the motherboard has the PCIe lanes and slot spacing for two cards before committing to the build.

TIP

flagship GPUs, do not run a 1200W unit at the edge, size to 1500-1600W so sustained AI load and transient spikes both stay within safe headroom.

FAQ

Is 1200W enough for a dual-GPU AI workstation?

It depends on the cards. For dual mid-range or professional GPUs, yes. For two RTX 5090-class flagships drawing over 1100W combined, 1200W is marginal, choose 1500-1600W.

What efficiency rating should an AI workstation PSU have?

80 Plus Platinum, since AI workloads run near full load for long periods, where efficiency reduces heat and running cost. A quality unit also handles sustained load reliably.

What case suits a dual-GPU workstation?

A high-airflow full tower, so both GPUs get clean intake air and the radiators or coolers breathe. Confirm slot spacing and PCIe lanes on the motherboard too.

Size the PSU to your actual cards, 1200W for dual mid-range, 1500W-plus for dual flagships, in a full tower, at Evetech.