For walk-in customers: please always INQUIRE FIRST before visiting as not all items are displayed in our physical store. As an online-first store, most of our inventory is held in our online warehouse and is transferred to the store upon request.
FSP HV PRO 85+ 550W 80 PLUS Bronze ATX 3.1 Non-Modular Power Supply, 120mm Fan, Black | FSP550-51AAC
Price Drop Alerts & Price History
⚠️ That's a steep drop! You might be waiting a while.
We'll notify you the moment the price hits your target.
The FSP HV PRO 85+ 550W is a non-modular ATX power supply for everyday desktops and mainstream gaming builds. This is the ATX 3.1 revision of model FSP550-51AAC: it carries 80 PLUS 230V EU Bronze certification, a single 45.8A +12V rail, dual 4+4 pin CPU connectors and two 6+2 pin PCIe connectors in a standard 150 × 140 × 86mm ATX housing.
This listing is the black unit; FSP sells a white version under its own model number, FSP550-51AAC,W. It suits Philippine buyers putting together an office PC, a school or home desktop, or a budget gaming rig with a single mid-range graphics card, and anyone replacing a tired or unbranded PSU in an existing build. One thing to know before buying: FSP has used the model number FSP550-51AAC on three different HV PRO products over the years. The unit sold here is the newest one, the HV PRO 85+ with ATX12V V3.1 compliance, not the original HV PRO with the lower 80 PLUS Standard rating.
Key Features and What They Mean
80 PLUS 230V EU Bronze, 88% at Typical Load
FSP rates this unit at 88% or higher efficiency at typical load, certified under the 80 PLUS 230V EU program. That program tests on 230V input, which is close to the 220V supply in Philippine homes and offices, so the rating reflects conditions similar to how the unit will actually run here. In practice, higher efficiency means less power turned into heat inside the PSU at the same load, which helps in a warm room without air conditioning.
Single +12V Rail With 45.8A
Almost everything that draws real power in a modern PC, the CPU and the graphics card, runs from the +12V rail. At 45.8A, the +12V rail can deliver about 549.6W (Netcodex calculation: 45.8A × 12V), essentially the full 550W rating. The +3.3V and +5V rails are generated by DC to DC modules and share a combined 100W, which is plenty for SSDs, USB devices and other low voltage loads.
ATX 3.1 Compliance
FSP states that this revision complies with ATX12V V3.1 and EPS12V V2.92 and supports power excursions of up to 200%. Power excursions are the very short spikes in draw that recent graphics cards produce under load; a PSU built to the newer standard is designed to ride through them rather than trip its protection. Note that ATX 3.1 compliance here does not mean a 12V-2×6 (12VHPWR) cable is included. Graphics card power comes only from the two 6+2 pin PCIe connectors.
Cables and Connectors
All cables are fixed. The 24-pin motherboard cable is 550mm. Both 4+4 pin CPU connectors sit on one cable, 700mm to the first and another 150mm to the second, which covers boards that ask for 8+4 or 8+8 pin CPU power and should give enough reach for routing behind the motherboard tray in most mid-tower cases. The two 6+2 pin PCIe connectors are also on a single cable (500mm, then 150mm). For drives there are five SATA connectors, two Molex and one floppy connector split across two cables, with 155mm between plugs. These lengths come from FSP’s cable drawing and carry a tolerance of plus or minus 10mm.
Protection, Capacitor and Fan
The unit includes over current, over voltage, over power and short circuit protection, uses a 450V / 105°C main capacitor, and is cooled by a 120mm sleeve bearing fan. Active PFC is rated at 0.9 or higher. In our assessment, the protection set is what you would expect from a reputable budget unit. The sleeve bearing fan is the cost saving part of the design: sleeve bearings are generally quiet when new but tend to wear sooner than fluid dynamic or ball bearing fans, especially in hot, dusty rooms, so keeping the intake side clean helps. In a short 2022 hands-on with the 650W sibling of the earlier HV PRO 85+ revision, Tech-Critter reported the fan was barely audible during testing; that was a brief test on a related model, not a long-term result for this exact unit.
Competitive Positioning
The HV PRO 85+ 550W sits in the entry level of branded, certified power supplies. Its main advantage over unrated or no-name units is a recognized manufacturer, a certified 80 PLUS 230V EU Bronze rating and a published protection set. Against pricier 550W to 650W units, it gives up modular cables, a longer life fan bearing and separate PCIe cables for each graphics card connector, and it is a Bronze unit rather than Gold, so it wastes a little more power as heat at the same load.
For a typical office, school or entry gaming build, those trade-offs are reasonable. For a build with a higher wattage graphics card or plans for a big GPU upgrade later, the money is better spent on a higher capacity unit with more PCIe cables.
Philippine Buyer Perspective
Our Take
What makes this unit worth considering is not a single headline spec but the combination: real Bronze certification measured at 230V, a single strong +12V rail that delivers almost the full 550W where the system needs it, dual CPU connectors for boards that need 8+4 or 8+8 pin power, and compliance with the ATX 3.1 standard. For a Philippine build running on 220V mains, the 200 to 240V input is not a limitation; it simply means this is not a unit for 110V setups.
The limits are just as clear. Both PCIe connectors come off one cable, there is no 12V-2×6 connector, and the cables are fixed, so a small case will need some cable tidying for the unused SATA, Molex and floppy plugs. We see it as a sensible choice for a system with a single mid-range graphics card that needs one or two 8-pin connectors, always checked against the card maker’s recommended PSU wattage. If you are planning a high-draw graphics card, look at a higher wattage unit with separate PCIe cables instead.
Because three FSP products share the FSP550-51AAC model number, older reviews and listings online may describe the original HV PRO with an 80 PLUS Standard rating. The specifications on this page are taken from FSP’s page for the HV PRO 85+ (ATX 3.1) 550W.
Known Compatibility and Setup Notes
Required: 200 to 240V AC input. The unit is specified for 200 to 240Vac only and is not rated for 110 to 120V mains. Standard Philippine 220V outlets are within range.
Possible consideration: graphics cards that use a 12V-2×6 or 12VHPWR power connector need the adapter supplied with the card, if one is included, because this PSU has only 6+2 pin PCIe connectors. Cards that need two 8-pin connectors will draw both from the same daisy-chained cable.
The housing is a standard ATX size at 150 × 140 × 86mm, so it fits cases built for ATX power supplies but not small form factor cases that require an SFX unit. Motherboards with an 8-pin CPU socket use one 4+4 connector; boards with 8+4 or 8+8 sockets use both. Because the cables are fixed, plan where the spare connectors will be stored before closing the side panel.
Who Should Buy This
Office and school PC builders who want a branded, Bronze certified PSU with full protection instead of a generic unit, for systems that will run long hours.
Budget gamers running a single mid-range graphics card with one or two 8-pin power connectors, after checking the card maker’s recommended PSU wattage.
Upgraders replacing an old or unbranded PSU in a standard ATX case, especially on motherboards that ask for 8+4 or 8+8 pin CPU power.
Not the right fit for high-draw graphics cards, cards that need a native 12V-2×6 cable, small form factor builds, or buyers who want modular cables for a clean showcase build.
FSP HV PRO 85+ (ATX 3.1) 550W Power Supply | FSP550-51AAC
Identification
Brand
FSP
Series
HV PRO 85+ (ATX 3.1 revision)
Model / SKU
FSP550-51AAC
Revision note
FSP uses the model number FSP550-51AAC on three HV PRO products. This listing is the HV PRO 85+ (ATX 3.1) unit: 80 PLUS 230V EU Bronze, ATX12V V3.1. It is not the original HV PRO (80 PLUS 230V EU Standard) or the earlier ATX12V V2.52 HV PRO 85+.
Color
Black housing (white version is a different SKU: FSP550-51AAC,W)
Power and Efficiency
Rated Output Power
550W (total)
Form Factor
ATX
80 PLUS Certification
230V EU Bronze
Efficiency
88% or higher at typical load
PFC
Active PFC, power factor 0.9 or higher
AC Input
200 to 240Vac, 4A, 50 to 60Hz
Main Capacitor
450V / 105°C
Standards and Protection
ATX Standard
Complies with ATX12V V3.1 and EPS12V V2.92 (Intel ATX 3.1 Power Design Guide); FSP states support for up to 200% power excursion
Single +12V rail; DC to DC modules for +5V and +3.3V
Cables and Connectors (fixed, non-modular)
24-pin ATX (motherboard)
1 × 24-pin, 550mm
CPU / EPS 4+4 pin
2 connectors on one cable: 700mm to the first, plus 150mm to the second
PCIe 6+2 pin
2 connectors on one cable: 500mm to the first, plus 150mm to the second
SATA
5 total: one cable with 4 × SATA (500mm, then 155mm spacing) plus 1 × SATA on the SATA / Molex / Floppy cable (500mm)
Molex 4-pin
2 (on the SATA / Molex / Floppy cable, 155mm spacing)
Floppy 4-pin
1 (end of the SATA / Molex / Floppy cable)
12V-2x6 / 12VHPWR
Not included
Cable length tolerance
All lengths ±10mm, per FSP cable drawing
Cooling and Physical
Fan
120mm sleeve bearing fan
Dimensions (L x W x H)
150 × 140 × 86mm
Packaging Weight
1.7 kg
Packaging Dimensions (L×W×H)
15 × 15 × 11 cm
Brand
FSP
Reviews
There are no reviews yet.
Only logged in customers who have purchased this product may leave a review.
ℹ️
Product Information Notice
Specifications, images, packaging, and included accessories shown on this page are based on information published by the manufacturer and are provided for reference only. Manufacturers may revise product specifications, features, SKUs, and designs at any time and without prior notice, and actual specifications may vary between board revisions, production batches, or regional versions of the same model.
While we take care to keep our listings accurate, we recommend verifying critical specifications on the manufacturer's official product page before purchasing. If a particular specification is essential to your purchase decision or build compatibility, please confirm it with our team first and we will verify the exact unit on hand.
Product images are for illustration purposes and may differ from the actual item. If you spot an error in any listing, please let us know so we can correct it promptly.
Reviews
There are no reviews yet.