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Thread: Seasonic Focus Plus 750w Review @Tomshardware

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    Default Seasonic Focus Plus 750w Review @Tomshardware


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    Great, it has no major flaws related to performance whatsoever. Two EPS, too. Nice.

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    No major flaws but it has a relative poor performance in transient tests at 3.3V rail and is noisy.

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    This is not what I'd call noisy, it is a quiet PSU at low and mid loads. Give me fairly loud @500w+ over this 800RPM+ at low loads crap every day.

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    Solid performer at an awesome price. I would pay a bit more for a better fan and I'd also remove in-cable caps, though, but every unit has its flaws: in this case, I have no bad thoughts about this one, overall.

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    This is not what I'd call noisy, it is a quiet PSU at low and mid loads. Give me fairly loud @500w+ over this 800RPM+ at low loads crap every day.
    I agree with you, as at low load is inaudible but if installed in a computer with a power consumption of about 500-650W then this PSU gets louder, by comparison with a RM750X which remain silent.
    Last week i bought for my brother-in-law some Focuses (550w model) and some be quiet! Straight Power 10 - 400 and i maked some tests with both models and various PC configurations and it's feel the difference of noise level between those when i approched the ear close to PSU (it needed to do that because in that populated office was a high ambiental noise like is in any office, and that ambiental noise make also a hair dryer to seem a silent device). The be quiet! is always inaudilbe but the Focus it's not so silent at high loads (FX8350 and an old GTX570) and the noise at higher load is worst at 750W model than 550w model.
    This is the point for which i call this PSU a noisy one.

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    "An AC power cord is also provided." No mention of the AWG.

    "We don't expect much from Hong Hua, but apparently Seasonic does since it's guaranteeing the SSR-750FX for 10 years." Is that because Seasonic bought the bearings, and supplied them to Hong Hua for inclusion into their fans?

    " . . . a CM02X that blocks current through the X cap discharge resistor when AC voltage is connected. It also automatically discharges the X cap through the discharge resistor when AC is disconnected." Does this feature make the PSU safe to handle when it is unplugged? I remember a discussion about residual charge making user intrusion unsafe.
    CPU: Core i7 8700k, HT enabled, all 6 cores OC'd to 4.8GHz, Vcore = 1.24v
    Heatsink: Noctua NH-D15 with one NF-A15 1500 RPM PWM fan
    Motherboard: Gigabyte Z370X Aorus Gaming 7
    RAM: 4x16GB (64GB) Corsair Vengeance LPX DDR4 RAM 16-18-18-36@3200MHz, Vdimm = 1.35v
    GPU: MSI GeForce GTX 1080 DirectX 12 with 8GB 256-Bit GDDR5X
    SSD1: Samsung 840 EVO 500GB TLC; SSD2: SAMSUNG 860 EVO 1TB 3-bit MLC
    HD: WD 500GB (old); Case: LIAN LI PC-7H Aluminum ATX Mid Tower
    PSU: Seasonic Platinum 660W

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    Quote Originally Posted by ehume View Post
    " . . . a CM02X that blocks current through the X cap discharge resistor when AC voltage is connected. It also automatically discharges the X cap through the discharge resistor when AC is disconnected." Does this feature make the PSU safe to handle when it is unplugged? I remember a discussion about residual charge making user intrusion unsafe.
    Those are generally for discharging the "X capacitors" (noise suppression on the input, the usually-yellow rectangular plastic ones). They will not discharge the bulk caps (or whatever you want to call them - the big electrolytics on the primary side) since the bridge rectifier is in the way. This means that voltage should not be present on the power connector after it's unplugged, but there may still be some inside the unit unless those capacitors have their own discharge system.

    Here's a diagram:

    The IC would go in series with the resistor across the left cap (100K), and disconnect it when (and only when) power is applied. It does nothing for the one across the right cap (10K). That right resistor may or may not be present, and may or may not have its own disconnect system.
    Last edited by cheapie; 10-31-2017 at 03:54 AM.

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    I don't know if Aris is going to read this but let's give it a try:
    Are there IR shots available from the OTP shutdown?
    Do you remember the power supplys behaviour after the shutdown?

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