Corsair SF1000 Platinum SFX (CP-9020257)

The Corsair SF1000 Platinum is a 1000 W fully modular power supply in the compact SFX form factor, sold under part number CP-9020257 in Corsair's SF Platinum Series. Corsair's headline for the series is platinum power for small-form-factor builds: an SFX supply that packs 80 PLUS Platinum efficiency into the most power-dense compact PCs. A kilowatt in an SFX body is unusual, and it is the main reason to look at this unit: it lets a small case host a high-end graphics card without moving to a larger ATX supply. The manufacturer's page shows a price, but a variant selector on the same page switches between 750 W, 850 W and 1000 W, so we do not tie a number to this exact unit and give no price. The page also gives no launch date. What follows is a reading of Corsair's published tables with a few labelled calculations. We have not tested the unit.

Ratings and rails

The power table lists the model code RPS0176 and the part number 75-005386. The AC input range is 100 to 240 V at 12 to 6 A and 47 to 63 Hz. The +12 V rail is rated for 83.3 A and 1000 W, the +3.3 V and +5 V rails for 20 A each with a combined limit of 130 W, and the +5Vsb standby output for 3 A and 15 W. Total power is 1000 W. A quick check: 83.3 A multiplied by 12 V is 999.6 W, which Corsair rounds to 1000 W, so the whole rating sits on the +12 V rail, where processors and graphics cards draw nearly all their power. For help deciding whether a kilowatt is more than your build needs, our guide on how much PSU wattage you need shows how to add up the components.

Cables and connectors

The cable set is short, which is the point in a small case. There is one 24-pin ATX cable of 300 mm, two EPS 4+4-pin cables of 400 mm, four separate PCIe 8-pin (6+2) cables of 400 mm each, and one 12VHPWR (12+4-pin) cable of 400 mm. For storage, there are two SATA cables of 445 mm with four connectors each, one straight and one right-angle, eight SATA connectors in total, and one PATA cable of 330 mm with three connectors. All cables are individually sleeved, and the supply uses Type 5 Micro-Fit connectors on the modular side, which Corsair says allow flexible cabling that takes up less space for tidy management in small cases. The page uses two names for the graphics cable, calling it 12V-2x6 in the feature text and 12VHPWR (12+4-pin) in the cable table. Our explainer on the 12VHPWR and 12V-2x6 connector describes how the two names relate.

Form factor and cooling

The tech-spec table lists the form factor as SFX and the fan as 92 mm with a fluid dynamic bearing. Corsair describes a PWM cooling fan with a Zero RPM mode that eliminates fan noise completely at low to medium loads. The supply is specified for continuous output at 50 C, and the capacitors are 100 percent industrial-grade 105 C rated Japanese electrolytic parts. The page does not list dimensions for this unit, and it does not mention an SFX-to-ATX adapter bracket in the text we read, so we make no claim about either. If your case is SFX-only, that is what you need; if it is an ATX case, our guide on SFX versus ATX power supplies explains what an SFX unit does and does not change for fit, cooling and noise. A small fan working harder is the usual price of compact power, and that is exactly why the Zero RPM mode and the noise grade matter here.

Efficiency and noise grades

The page lists 80 PLUS Platinum, Cybenetics Efficiency Platinum and Cybenetics Noise Standard++. The SF850 Platinum that is already in our database lists the same efficiency grades but a noise grade of A-, so the noise grade here is different. We do not interpret the Cybenetics scale in this entry, and we do not claim that one unit is quieter in practice; the grades come from Corsair's page and independent testing is the right place to compare them. For the broader question of what the efficiency tiers mean, read our guide on 80 PLUS tiers. The standards are ATX12V 3.1, with Corsair stating that SF Series supplies are formally certified for ATX 3.1, and EPS12V 2.92, and a PCIe 5.1 12V-2x6 GPU cable is included. The warranty is seven years, the MTBF is 100,000 hours and the weight is 2 kg.

Where it sits in our database

The closest relative is the SF850 Platinum, which lists 850 W, a +12 V rail of 70.8 A, three PCIe 8-pin connectors, a 12VHPWR cable, eight SATA connectors, three PATA connectors, a 92 mm fluid dynamic bearing fan, Type 5 cables and a seven-year warranty. Set against it, the SF1000 adds 150 W of rating (about 18 percent more than 850 W, our arithmetic), a +12 V rail of 83.3 A against 70.8 A, one more PCIe 8-pin connector (four against three) and a 130 W combined limit on the 3.3 V and 5 V rails that is the same as on the SF850. The input range, the fan, the cable type and the warranty are the same. Below both sits the SF600 Platinum, which lists 600 W and an older ATX12V v2.4 standard. You can read the first pair side by side in our comparison of the SF1000 and the SF850, and the full power supply category is open for wider browsing.

What the page does not say

Corsair's page does not give a launch date, physical dimensions, a detailed efficiency curve or a mounting-bracket statement. It also repeats guide links on PSU sizing, protections and SFX versus ATX cables, and we do not copy their conclusions. Use this entry to check the facts that decide fit: the SFX form factor, the 1000 W rating, the four PCIe 8-pin connectors plus a 12VHPWR cable, the 92 mm fan and the seven-year warranty. Then look at independent testing for noise under load, because that is where a small high-power supply is most likely to differ from its specification sheet, and measure your case for the supply's depth and the cable reach.