Best Sellers
Top Rated- $181.56
- + FREE SHIPPING
SeaSonic CORE GX-750 ATX3 750 W ATX Fully Modular 80 PLUS GOLD Certified Full Modular Power Supplies
- ATX Fully Modular
- Full Modular
- 80 PLUS GOLD Certified
+
+
Overview
Specs
Reviews (26)
Warranty & Returns
Warranty, Returns, And Additional Information
Warranty
- Limited Warranty period (parts): 1 year
- Limited Warranty period (labor): 1 year
- Read full details
Return Policies
- Return for refund until: January 31, 2027
- Return for replacement until: January 31, 2027
- This item is covered by Newegg.ca's Extended Holiday Return Policy.
- Read full return policy for details.
We want to ensure your holiday shopping this year is hassle-free. That’s why we’re automatically extending our return policies on almost every product! For purchases placed between November 1st, 2026 and December 31, 2026 you will have until January 31, 2027 to return your product.
Manufacturer Contact Info
- Manufacturer Product Page
- Manufacturer Website
- Support Phone: 1-626-969-9966
- Support Website
- View other products from Seasonic
LOADING...
LOADING...
The SeaSonic CORE GX-750 ATX3 is a 750W fully modular ATX power supply with 80 PLUS Gold certification and a 16-pin PCIe Gen 5 12V-2x6 cable, making it suitable for gaming PCs and performance-oriented builds using modern graphics cards.
Recommended For
- PC builders assembling a modern single-GPU gaming system who want native ATX 3.1 and PCIe 5.1 support, including a 12V-2x6 cable for newer graphics cards.
- Value-focused builders who want a fully modular, 750-watt Gold-rated PSU with current GPU connectivity without paying for Seasonic’s higher-tier Focus series.
- DIY PC builders working in compact ATX cases who need a short 140 mm power supply and modular cables for easier installation and cable routing.
- Users upgrading an older gaming PC who want a current PSU standard and native next-generation GPU support while retaining compatibility with older graphics cards through the included adapter.
Real-World Use Scenarios
- A user is building or upgrading a single-GPU gaming PC with a high-performance processor and wants current-generation GPU power connectivity. The 750W capacity and native 12V-2x6 cable can support a suitable ATX 3.1 graphics-card build, provided the GPU and total system power recommendations remain within the PSU’s limits.
- A builder is installing a modern graphics card that supports a native 12V-2x6 connection and wants to avoid using a multi-plug adapter. The included native cable provides a cleaner direct connection, although the graphics card’s recommended PSU wattage still needs to be checked before purchase.
- A user is assembling a compact or space-constrained ATX computer and needs the power supply to leave room for cables and storage hardware. The 140 mm PSU length improves case compatibility and makes installation and cable routing easier than with longer units.
- A builder wants a cleaner custom PC installation and does not need every power cable connected. Because the unit is fully modular, unused cables can be left out of the case, reducing cable congestion and simplifying access around the motherboard and graphics card.
- A user is replacing an older power supply while keeping some existing modular cables. The expected installation experience is straightforward only when the supplied cables are used; modular PSU cables should not be transferred between models unless Seasonic specifically confirms compatibility.
- A gamer or home workstation user is running sustained CPU- and GPU-heavy workloads and wants consistent power delivery rather than peak benchmark performance. Testing and review data indicate stable operation across normal load ranges, while the fan can become audible during heavy loads because this model does not provide a full fan-stop hybrid mode.
Spec Summary
| Attribute | Value |
|---|---|
| Best For | ATX desktop builds up to 750 W, including systems with PCIe 5.0 graphics cards, standard ATX motherboards, storage drives, and expansion cards; full modular cabling supports flexible cable management |
| Power Output And Efficiency | 750 W power supply with 80 PLUS Gold certification for an ATX desktop system |
| Modular Design And Connectors | Fully modular ATX design with a 16-pin PCIe Gen 5 ATX 3 cable using a 12V-2x6 connector, plus a 24-pin ATX connector and 9 total PSU connectors |
| Cooling | Air-cooled by one 120 mm Hydro Dynamic Bearing fan |
| Input And Physical Specifications | Accepts 90–240 V AC input, measures up to 140 mm in PSU length, and has a black finish |
| Model Identifiers | SeaSonic CORE GX-750 ATX3 |
Reference Q&A
Q: Is the Seasonic CORE GX-750 ATX3 better than the Corsair RM750e for a gaming PC?
A: Both are 750 W, fully modular ATX 3.1 power supplies with native 12V-2x6 GPU cables and PCIe 5.1 compatibility. Choose the Seasonic CORE GX-750 ATX3 when you prefer Seasonic’s 7-year warranty, 140 mm chassis, and tested electrical performance. Choose the Corsair RM750e when its flexible embossed cables, compact cable-management design, or lower purchase price is more important.
Q: Should I buy the Seasonic CORE GX-750 ATX3 or the be quiet! Pure Power 12 M 750W?
A: Choose the Seasonic CORE GX-750 ATX3 for the newer ATX 3.1 and PCIe 5.1 specification combination with a native 12V-2x6 cable. Choose the be quiet! Pure Power 12 M 750W when low-noise operation is the main priority; it is marketed around quiet performance and uses a temperature-controlled 120 mm fan. Both provide 750 W, 80 PLUS Gold efficiency, modular cabling, and support for modern GPUs.
Q: Is the Seasonic CORE GX-750 ATX3 worth choosing over a cheaper 650W power supply?
A: The CORE GX-750 ATX3 is the better choice when the system may approach 650 W, uses a power-demanding graphics card, or needs additional headroom for transient loads and future upgrades. A quality 650 W model is sufficient when the calculated system load remains comfortably below 650 W and no higher-power GPU upgrade is planned. The main advantages of the 750 W model are capacity, full modular cabling, and its native 12V-2x6 connector.
Q: Should I choose the Seasonic CORE GX-750 ATX3 or step up to an 850W power supply?
A: Choose the CORE GX-750 ATX3 when the system’s expected power draw fits within 750 W and the build uses one mainstream graphics card. Choose an 850 W model when you want more upgrade headroom, run a higher-power GPU, use a power-hungry processor, or expect sustained heavy workloads. Moving to 850 W does not increase gaming performance by itself; it mainly provides additional capacity and operating margin.
Q: Is the CORE GX-750 ATX3 a meaningful upgrade from an older 750W ATX 2.x PSU?
A: Upgrade to the CORE GX-750 ATX3 when the new graphics card requires a native 12V-2x6 connection, ATX 3.1 transient-load support, or a cleaner fully modular cable setup. Replacing an older 750 W unit is less urgent when it is still reliable, has suitable connectors, and provides enough capacity for the current system. The upgrade changes connectivity and platform compatibility more than the nominal wattage.
Q: Is 750 watts enough for a gaming PC?
A: It can be enough for many mainstream and high-performance gaming PCs, but actual suitability depends on the graphics card, processor, and total system power demand. Check the recommended PSU wattage for the specific GPU and leave additional headroom for transient power spikes. ([bestbuy.com](https://www.bestbuy.com/site/questions/misc/6356248?page=2&utm_source=openai))
Q: Does this power supply support graphics cards with a 16-pin PCIe connector?
A: Yes. The CORE GX-750 ATX3 includes an ATX 3 and 16-pin PCIe Gen 5 cable using the 12V-2x6 connector, so it is designed for compatible graphics cards that use this connection. Confirm the GPU's required connector and power rating before purchase. ([bestbuy.com](https://www.bestbuy.com/site/questions/corsair-rme-series-rm750e-80-plus-gold-fully-modular-low-noise-atx-3-0-and-pcie-5-0-power-supply-psu-black/6537989?utm_source=openai))
Q: What does fully modular mean, and does it include the cables?
A: Fully modular means the power cables detach from the PSU, allowing you to connect only the cables your build needs. Use the cables supplied with this PSU; modular cables from another power supply may use different pinouts and should not be mixed. ([bestbuy.com](https://www.bestbuy.com/site/questions/corsair-rme-series-rm750e-80-plus-gold-fully-modular-low-noise-atx-3-0-and-pcie-5-0-power-supply-psu-black/6537989?utm_source=openai))
Q: Will this 750W PSU fit in my PC case?
A: The PSU is 140 mm long and uses the standard ATX form factor, so it should fit many ATX-compatible cases. Verify the case manual for PSU-length clearance, especially in compact cases or systems with limited cable-management space. ([bestbuy.com](https://www.bestbuy.com/site/questions/corsair-rme-series-rm750e-80-plus-gold-fully-modular-low-noise-atx-3-0-and-pcie-5-0-power-supply-psu-black/6537989?utm_source=openai))
Q: Is this PSU efficient and reasonably suitable for a quiet PC?
A: It is 80 PLUS Gold certified and uses a 120 mm Hydro Dynamic Bearing fan. The Gold certification indicates an efficiency class, while the fan provides active cooling; the provided specifications do not include a specific noise rating or zero-RPM operating mode, so noise performance should not be assumed. ([bestbuy.com](https://www.bestbuy.com/site/questions/corsair-rme-series-rm750e-80-plus-gold-fully-modular-low-noise-atx-3-0-and-pcie-5-0-power-supply-psu-black/6537989?utm_source=openai))
Q: Is the Seasonic CORE GX-750 ATX3 enough for a modern gaming PC?
A: It is generally suitable for gaming systems that fit within a 750 W power budget. Reddit users reported that 750 W was sufficient for systems using an RTX 3070 or RX 9070 XT, but actual suitability depends on the CPU, GPU power limits, and the rest of the build. ([reddit.com](https://www.reddit.com/r/buildapc/comments/1suad5o/am_i_good_with_seasonic_750w_psu_with_asrock/?utm_source=openai))
Q: Does the CORE GX-750 ATX3 work well with graphics cards that use a 16-pin connector?
A: Yes. The product includes an ATX 3-compatible 16-pin PCIe Gen 5 cable using the 12V-2x6 connector, which is intended for compatible modern graphics cards. Buyers should still confirm the GPU’s required connector and power rating before purchasing. ([reddit.com](https://www.reddit.com/r/buildapc/comments/1b7y668?utm_source=openai))
Q: Is the 750 W model suitable for a GPU that requires three separate 8-pin PCIe connections?
A: Check the included cable count carefully before buying. Reddit discussions report that some CORE GX-750 configurations may not include enough separate PCIe cables for GPUs requiring three 8-pin connections, even though the PSU is fully modular. A compatible Seasonic cable or a higher-wattage model may be required. ([reddit.com](https://www.reddit.com/r/Seasonic/comments/1q79htl/gpu_needs_38pin_pcie_core_gx_750w_only_includes_2/?utm_source=openai))
Q: Should I choose the CORE GX-750 ATX3 or buy a higher-wattage PSU for future upgrades?
A: Choose the 750 W model when the current system’s calculated power use leaves reasonable headroom and the price is favorable. A higher-wattage PSU is more appropriate if you expect a substantially more power-hungry graphics card or want additional upgrade margin. Reddit users generally viewed 750 W as adequate for current mid- to high-end builds, but noted that higher wattage can improve upgrade flexibility. ([reddit.com](https://www.reddit.com/r/buildapc/comments/1suad5o/am_i_good_with_seasonic_750w_psu_with_asrock/?utm_source=openai))
Q: Can I reuse modular cables from another Seasonic power supply with the CORE GX-750 ATX3?
A: Do not assume compatibility based only on the Seasonic brand or connector shape. Use the cables supplied with this PSU or verify exact model compatibility through Seasonic before reusing cables from another unit. Reddit users specifically raised compatibility concerns when moving cables between CORE and Focus models. ([reddit.com](https://www.reddit.com/r/Seasonic/comments/1ks4nh2?utm_source=openai))