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Suggested headroom · Good to go

Solution builder

ROG Strix GeForce RTX 4090 · O11 Dynamic EVO · ProArt X870E-CREATOR WIFI · 1,000 W PSU · Llama 3.1 8B Instruct (Q4_K_M)

Every verdict here is on paper, from catalogue specifications. The builder recommends no hardware and shows no prices.

Power: Suggested headroom. Workload: Good to go. 0 checks need attention.

This is a worked example. Change any part to plan your own machine.

Build check

  • Parts live
  • Catalogue live

Power draw

≈ 575 W load

ROG Strix GeForce RTX 4090
450 W
CPU and host (assumed)
125 W

Lines mark 80% line, 1,000 W PSU. The CPU and the rest of the host are an assumption.

On paper

PSU load

58 % of rating

Suggested headroom

Scale 0–100% of the PSU's rating. Red: above the 80% line.

On paper

Memory

≈ 6.4 GB needed

largest card 24 GB

Red: more than the largest card here, 24 GB.

On paper

Bandwidth

≈ 255 GB/s needed

card rated 1,008 GB/s

Red: past the card's rated bandwidth.

Checks

  • Fits the case, lit
  • Spacing, lit
  • Risers and mount, not checked
  • Slots and lanes, lit
  • Power headroom, lit
  • Fits in memory, lit
  • Speed, lit
  • Needs a split, not checked

Good to go: Largest single card: ROG Strix GeForce RTX 4090 (24 GB). On paper, from catalogue specifications.

Every check, figure and listing (0 need attention)

  • Fit and slot count Passes

    • Passes ROG Strix GeForce RTX 4090: Fits in O11 Dynamic EVO. 68.4 mm spare
    • Passes The cards in slots need 4 expansion slots; O11 Dynamic EVO has 8.
    • Passes 1 cards need a PCIe slot; ProArt X870E-CREATOR WIFI has 3.

  • Spacing Passes

    • Passes No card overlaps another or runs past the case.

  • Risers and mounting Not checked

  • Slots and lanes Passes

    • Passes Slot 2 (PCIe 5 x16) carries ROG Strix GeForce RTX 4090's PCIe 4 x16.

  • Power Suggested headroom

    • Passes The sustained load is 58% of the PSU's rating, at or under 80%.
    • The CPU and the rest of the host aren't in the catalogue. 125 W is allowed for them, an assumption you can change.
    • The 80% and 70% limits are GPU Ninja's reading of Intel's ATX v3 design guide, GPU makers' PSU recommendations and PSU makers' guidance, not a published standard.
    • ROG Strix GeForce RTX 4090 uses a 12V-2x6 connector and may spike to 3× its power (1,350 W) for up to 100 µs.
    • An ATX 3.x PSU over 450 W is built to carry 200% of its rating (2,000 W) for 100 µs.

  • Power

    Power
    BoardCountPower eachPowerRecommended PSUConnectors
    ROG Strix GeForce RTX 40901450 W450 W1,000 W1× 12VHPWR
    Total card power450 W
    CPU and host (assumed)125 W
    Estimated sustained load575 W
    PSU1,000 W, ATX 3.x
    Headroom425 W
    Headroom over the largest recommended PSU0 W
    PCIe 8-pin connectors needed0
    12V-2x6 connectors needed1
    Other connectors needed0

  • Memory

    Memory
    MeasureMemoryCard
    Largest single card24 GBROG Strix GeForce RTX 4090
    All cards together (needs the model split across them)24 GB

    Takes 1 of ROG Strix GeForce RTX 4090 for this workload's memory.

  • Workload Good to go

    • One card: the split verdict is the same as the single-card verdict.

    On paper, from catalogue specifications. Largest single card: ROG Strix GeForce RTX 4090 (24 GB)

    Good to go

    • Fits in memory: needs ≈ 6.4 GB of the largest card's 24 GB, leaving 17.6 GB free.
    • GeForce RTX 4090 is rated 1,008 GB/s, at least the ≈ 255 GB/s that 30 tok/s needs.

    Estimator v1

  • Where to buy

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    Other parts for AM5

    GPU Ninja doesn't list CPUs, memory, storage or PSUs. These links search Newegg for the chosen socket.

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