Start from your GPU maker’s recommended PSU wattage, then pick a Seasonic fully modular 80 PLUS Gold unit in the 750 W / 850 W / 1000 W band that also names the ATX 3.x / PCIe 5.x support your graphics card needs. Do not invent a wattage from a random online calculator — use the GPU guidance and sensible headroom.
Shop in Electronics and Computer accessories. Sibling overview: 80 PLUS Gold Modular PSUs for AU PC Builds.
Direct answer — which wattage band?
| Band | Typical use (guidance only) | Live Seasonic examples on Darrah Opens |
|---|---|---|
| 750 W | Mid-range GPU builds where the vendor recommends around this class | Focus GX-750 V4, Core GX-750, Focus GX-750 White |
| 850 W | Higher GPU tiers / more headroom for CPU + multi-drive | Focus GX-850 V4, Core GX-850, Focus GX-850 White |
| 1000 W | High-power GPUs, heavy creator loads, future-proofing within case limits | Focus GX-1000 V4, Vertex GX-1000 White |
Always re-check the live title for ATX 3.0 / ATX 3.1 / PCIe 5.1 wording and modular cable set.
What “ATX 3.0 / 3.1” is doing on the label
Newer GPUs can pull sharp power spikes and may use high-power PCIe 5-style connectors. When a Darrah Opens Seasonic title includes ATX 3.1 / PCIe 5.1 (Focus GX V4 examples) or ATX 3.0 (white Focus / Vertex examples), read the product page for:
- Included GPU power cables
- Whether adapters are required for your card
- Continuous wattage rating
If your GPU still uses multiple legacy 8-pin PCIe plugs, a Gold modular ATX 3.x unit can still be appropriate — match cables to the GPU manual.
Focus GX V4 vs Core GX vs White / Vertex lines
| Line (examples) | Why builders look |
|---|---|
| Focus GX V4 (750 / 850 / 1000) | Fully modular, 80 PLUS Gold, ATX 3.1 / PCIe 5.1 named on titles |
| Core GX (750 / 850) | Gold full modular with ATX 3 naming on titles — compare feature set on each page |
| Focus GX White (750 / 850) | Same wattage class with white chassis for show builds — see white setup expansion draft |
| Vertex GX White (1000 / 1200) | Higher wattage white Gold modular options on the computer-accessories collection |
This guide intentionally does not invent AUD prices — compare current pricing on each product page.
Choosing 750 vs 850 vs 1000 without guessing
- Read the GPU vendor’s recommended PSU wattage for your exact card.
- Add allowance for a power-hungry CPU, multiple drives, and RGB/fans.
- If you sit near the recommendation and run long renders or hot-summer gaming sessions, step up one band.
- Confirm case ATX depth — the Focus GX-750 White listing notes a compact 140 mm depth among its specs; always check the SKU you buy.
- Prefer fully modular flat cables for airflow in mid-towers.
Avoid
- Undersizing because “Gold is efficient”
- Jumping to extreme wattages your case/cables cannot use cleanly
- Ignoring connector generation for PCIe 5 GPUs
Australian practicalities
- Mains are 230–240 V; modern ATX units are typically full-range — confirm the label (Focus GX White lists 100–240 V input on its page).
- Dust and heat: modular cabling + filtered intakes help; clean filters in summer.
- Noise: fan curves differ by series — the white Focus GX listing notes S3FC fanless until 30% load language; verify on your SKU.
Pre-purchase checklist
- GPU maker wattage met or exceeded
- 80 PLUS Gold (or higher if you deliberately step up)
- Fully modular for your cable plan
- ATX 3.x / PCIe 5.x named when required
- Depth fits the case
- White vs black chassis decided for build aesthetic
Who Seasonic ATX 3 wattage bands suit
Aussie PC builders matching GPU maker PSU recommendations to Focus GX V4 / Core GX / white Vertex modular Gold units in the 750 / 850 / 1000 W conversation — plus white 1200 W Vertex where listed.
Headroom without invented calculators
Start from the GPU recommendation, add drives and fans realistically, then step up a band if you run a power-hungry GPU and heavy CPU together. Do not invent continuous-watt charts — use the maker card and the Seasonic page wattage.
Cable kits and case fit
Fully modular Focus / Vertex units help small ATX and dual-chamber cases — connect the 12V-2x6 / PCIe leads your GPU needs as named on the Seasonic page, and leave unused modular cables bagged. Confirm the PSU depth (compact ~140 mm class on many Focus listings) clears your case’s PSU tunnel.
FAQ
Is 850 W always safer than 750 W?
Safer only when your GPU recommendation and system draw justify it. Oversizing without need mainly costs money and case space.
Do I need ATX 3.1 specifically?
Need it when your GPU ecosystem expects that generation of transient handling / native high-power connector support. Otherwise ATX 3.0 Gold modular units may still suit — match the card manual.
Focus GX V4 or Core GX?
Compare the live pages for the wattage you need. Both appear as Gold full modular with ATX 3.x naming; features and pricing differ by SKU.
Where is the white modular tidy-cable guide?
See the white modular PSU setup expansion draft in this batch, including Focus GX White and Vertex GX-1000 White links.
Where do I shop Seasonic on Darrah Opens?
Computer accessories and the product URLs above; also the primary 80 PLUS Gold modular PSU guide.
What does 80 PLUS Gold mean on these units?
It is an efficiency certification tier printed on the Seasonic Gold listings — not a wattage upgrade by itself.
Why does ATX 3.x / PCIe 5.x matter?
Newer GPU power connectors and transient handling are part of the ATX 3.x story on Focus GX V4 and related pages — match to your GPU maker guidance.
Is 1000W always safer than 750W?
Not automatically. Oversizing is fine within reason; buying 1000W for a low-power office PC wastes money and case space. Follow GPU recommendations first.
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