FSP VITA GM 750W ATX v3.1 PSU Review

Part Analysis

General Data
Manufacturer (OEM) FSP
PCB Type Double-Sided
Primary Side
Transient Filter 4x Y caps, 2x X caps, 2x CM chokes, 1x MOV
Inrush Protection 1x NTC Thermistor SCK-056 (5 Ohm) & Relay
Bridge Rectifier(s)
2x GBJ1506 (600V, 15A @ 100°C)
APFC MOSFETs
2x Toshiba TK16A60W (600V, 15.8A @ 150°C, Rds(on): 0.19Ohm)
APFC Boost Diode
1x Toshiba TRS6E65F (650V, 6A, @ 175°C)
Bulk Cap(s)
1x Toshin Kogyo TK (450V, 560uF, 3,000h @ 105°C, LGWA)
Main Switchers
2x Toshiba TK12A60W (600V, 11.5A, @ 150°C, Rds(on): 0.3Ohm)
APFC Controller Champion CM6500UNX
Resonant Controller Champion CU6901VPA
Topology
Primary side: APFC, Half-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters
Secondary Side
+12V MOSFETs 4x CYStek MTB1D6NO4RH8 (40V, 84A @ 100°C, Rds(on): 1.8mOhm)
5V & 3.3V DC-DC Converters: 4x XSEMI XP3R303GMT-L (30V, 25A @ 70°C, Rds(on): 3.3mOhm)
PWM Controller(s): UPI uP3861P
Filtering Capacitors Electrolytic:
6x Nippon Chemi-Con (1-5,000h @ 105°C, KZE),
2x Rubycon (6-10,000h @ 105°C, ZLH),
Polymer: 4x CapXon, 2x Apaq, 26x
Supervisor IC IN1T703I-SDG
Fan Model Yate Loon D12SH-12 (120mm, 12V, 0.30A, Rifle Bearing Fan)
5VSB Circuit
TVS Diode 1x SMAJ15A
High Side Rectifier US1MGR (1000V, 1A)
Standby PWM Controller Grenery GR9230UK

The design looks clean and neat, with several electrolytic caps on the secondary side, which have unobstructed airflow. The heat sinks are not large, especially on the secondary side, where the 12V FETs are on the PCB’s solder side. The soldering quality is good in this unit. The parts that FSP used are of decent quality except for the fan, which is terrible. The FETs regulating the 12V rail are also by a lesser-known manufacturer, but they didn’t create any issues during testing under harsh conditions.

The unit’s design is contemporary, with a half-bridge topology on the primary side and an LLC resonant converter for lossless switching. Four CYStek FETs handle the 12V rail on the secondary side, and a pair of PWM controllers generate the minor rails. Instead of an ANPEC PWM controller on the VRMs, we find one from UPI.

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19 thoughts on “FSP VITA GM 750W ATX v3.1 PSU Review

  1. I know I’m late to the party, but I bought the VITA GM 750W yesterday. My unit comes with only a 300W-rated 12V‑2×6 cable. I expected a 600W cable, although I think a 450W cable would be sufficient for a 750W PSU. The 300W cable feels a bit underpowered.

    Did FSP silently change the cable, or did only the review units come with the 600W-rated cable?

      1. First, thanks for the reply!

        If I’m right, you’re saying the cable is capable of 600W throughput, but the sense pins are configured differently.

        My problem with this whole thing is that there is no clear indication that this PSU only comes with a 300W 12V-2×6 cable. There is no mention of it on the manufacturer’s website, not even in the manual. Cybenetics and this review state it’s 600W, so it’s safe to assume it’s 600W.

        The PSU can handle a GPU like the RTX 5080, but the native 12V-2×6 cable can’t. Using an adapter is the solution, which can go up to 600W, but then why do we even have the native cable? Like in the review, 600W is overkill, but a 450W one is sufficient for a unit like this; there is still plenty left for other components if it’s a safety concern.

        I just feel a little scammed because the reviewer’s unit is different from the retail ones, and again, this is not stated anywhere.

        1. normally a 750/850W unit should come with a 300W set cable and NOT higher. If you want 600W you should go with a 1050W PSU or higher. This is according to Intel’s rules.

  2. FSP was in the past not known for silent PSUs, looks like it changed. I hope the Non-modular variants also silent?

  3. brother i want to ask

    right now i have 650 rmx 2018 version of corsair psu

    my system was 7900 gre hellhound standart clock
    7800x3d standart clock
    6400mhz expo ram
    3 hdd 2.5 inc
    1 ssd 2.5 inch
    2 nvme drive
    and a lot of fans like 6 fans

    is this psu decent ? i am planning to get 5070 in future

    this psu was very2 cheap because promotion please answer is it good?

  4. Your in depth reviews of psu’s are amazing.

    I hope you review the Lian Li Edge 1300 and new phanteks revolt 1200. I want one of those psu’s for my new built.

      1. I’m in Indonesia and bought 1000w version. Bulk caps is Toshin Kogyo. The box said it’s Korean version. Perhaps some region in Asia using TK caps instead Nippon Chemicon to reduce price.

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