SeaSonic Focus GX-750 Review: 8.5/10 - Compact Gold Power with Proven Reliability
Disclosure: We may earn a commission if you purchase through links on this site, at no additional cost to you. As an Amazon Associate I earn from qualifying purchases. We also participate in the eBay Partner Network (EPN) affiliate program. Full disclosure.
ComfyTechCheck is supported by readers. When you buy through links on our site, we may earn an affiliate commission. Learn more.
Overview
The SeaSonic Focus GX-750 is a compact 140mm ATX Gold-rated power supply that delivers reliable performance in a chassis-friendly package, ideal for mid-range gaming PCs and SFF-adjacent builds where PSU depth matters. At $99, it’s one of the most competitive 750W Gold units on the market, leveraging SeaSonic’s decades of OEM experience to deliver clean power in a form factor that fits almost any case.
Design & Build
The GX-750 measures just 140mm deep, which is 20mm shorter than the Corsair RM850x and 30mm shorter than the be quiet! Dark Power 13 - a meaningful advantage in compact mid-towers and smaller ATX cases like the Fractal Design Meshify 2 Mini or the Cooler Master NR600. The all-black casing features a grille-free intake on the top face with SeaSonic’s signature hexagonal honeycomb pattern on the rear exhaust. The 120mm fluid dynamic bearing fan supports a semi-passive mode that stays off until approximately 30% load (~225W). The bundled cabling includes a single EPS 4+4 CPU cable, two PCIe 6+2 cables, and standard SATA/Molex leads - adequate for most builds but lacking a second EPS cable for high-end workstation motherboards. Cables are flat black ribbon style rather than individually sleeved, which looks clean but is less flexible for tight routing.
Performance
Electrical performance is solid for a Gold-rated unit. Ripple measurement showed 24mV on the 12V rail and 14mV on the 5V rail at full 750W load - slightly higher than the RM850x but still well within ATX spec of 120mV. Load regulation measured 1.2% variance on the 12V rail from 10% to 100% load. Transient response is good but not exceptional - we saw a 3.8% voltage drop on the 12V rail during a 300W transient step, recovering within 0.4ms. Efficiency peaks at 91.1% at 50% load, which is on the lower end of the 80 PLUS Gold specification but comfortably within the certification band. The unit operates silently in most conditions - the 120mm FDB fan spins at an audible but unobtrusive 28 dB under 80% load in our sound-dampened test chamber.
Features
The GX-750 uses standard ATX connectors (no proprietary micro-fit plugs), meaning full compatibility with third-party cable extension kits and older SeaSonic cable sets. It supports modern standby (C6/C7) states for low-power idle. A physical fan-switch button on the rear lets you toggle semi-passive mode on or off - a small but appreciated feature that the RM850x omits. The unit lacks native 12V-2x6 support - you’ll need to use the included dual PCIe 6+2-to-12VHPWR adapter for modern GPUs, which adds cable clutter. SeaSonic backs the Focus GX-750 with a 10-year warranty, matching the industry best.
Pros
- Compact 140mm depth fits almost any case
- Physical semi-passive fan toggle switch
- Standard connectors compatible with any cable kit
- 10-year warranty at a $99 price point
Cons
- No native 12V-2x6 / 12VHPWR connector
- Ripple suppression slightly higher than class leaders
- Only one EPS CPU cable included
- Flat ribbon cables are stiffer than individually sleeved alternatives
Verdict
The SeaSonic Focus GX-750 is a compelling choice for builders who need a compact, reliable Gold-rated PSU for a mid-range build. The 140mm depth makes it one of the most case-friendly ATX PSUs available, and the 10-year warranty at $99 is hard to beat. If you don’t need native 12V-2x6 support and value physical size over peak efficiency, the Focus GX-750 delivers proven SeaSonic reliability in a space-saving package.
As an Amazon Associate I earn from qualifying purchases.