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Thread: PSU suggestions for i7-8700k build

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    Default PSU suggestions for i7-8700k build

    Hello everyone, am looking for a new PSU. I've been using the Cooler Master GM550 Bronze for the past 5 years - no issues.

    I'm upgrading my computer and current working specs are:
    i7-8700k (plan on overclocking)
    GTX 1060 6GB (may upgrade to a 1080ti or new AMD Navi next year)
    Samsung 970 m.2 256GB
    SanDisk Ultra II SSD
    Kingston HyperX Fury 16GB DDR4

    Looking in the 750w range (gold/platinum) - would this be sufficient? Is it worth to go up to the 850w or 1000w range? Any recommendations or advice would be appreciated, thank you!

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    Why 750W??
    For that a good 550W is more than enough...

    750W is something for high end desktop, 500€+ CPUs...

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    Yeah. Agree with Stefan here. You don't need a bigger PSU. There's no advantage to doing that.

    Your Cooler Master isn't a horrible PSU either. I think the fact that it's 5 years old is the worst thing going for it.

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    ...why do they generally give longer warranties on larger capacity units? such as 750W+?

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    They don't? It's mostly by series. But if someone does that, it's because of the higher margin. Most of the time the difference in 100W is less then 1 dollar to make the PSU. But if they sell them the difference is like 10 dollars most of the time. Long warranty is just nothing more then a marketing bullet point. And the manufacturer is just letting you pay for it. So how bigger the margin how longer the warranty can be.

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    adamsleath (12-09-2018), breixobaloca (12-09-2018), turkey3_scratch (12-10-2018)

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    (I think) only EVGA does that and the reason is not related with quality as Mask explains.

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    Once upon a time, I ran an i7 8700k at 5GHz, using a Vcore of 1.37v (this was to test heatsinks). Using the iGPU, I powered the thing with a Gold-rated PSU of 460W. Add a 1060? Well, others can advise you, but running an i7 8700k is no big deal. If the experts say that 550W is enough, believe them.
    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 adamsleath View Post
    ...why do they generally give longer warranties on larger capacity units? such as 750W+?
    Who is "they"? I have not seen this.

    Usually better quality PSUs get the longer warranty.

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    Quote Originally Posted by jonnyGURU View Post
    Who is "they"? I have not seen this.

    Usually better quality PSUs get the longer warranty.
    corsair
    seasonic
    evga
    antec

    if the longer warranty is just a marketing measure then all very well. i'm sure you have a very detailed knowledge of psu's...i doubt anyone would question that. i'm all ears.

    it seems the longer warranty comes at a price premium. and no doubt there are many psu's of smaller capacity that may last the 10 year mark...even when they dont have the longer warranty. In Australia there is a more limited choice compared to the u.s. sometimes newegg offers good deals, even free shipping on some items, once the shipping is added however it is often less expensive to buy locally...from the price point of view.

    it might be a false economy to buy some cheaper units. while others might go the distance. i certainly dont know how to ascertain it. so i pay a bit more for the warranty.
    ---
    definitely hard to find a lower capacity psu , in Aus. that have longer warranty periods. seasonic had a 400w fanless unit ...available here at one time, it was pretty pricey, but it may have been a very good unit.
    https://www.umart.com.au/SeaSonic-40...II_23840G.html

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    Quote Originally Posted by adamsleath View Post
    corsair
    seasonic
    evga
    antec
    Sorry. You are completely wrong.

    Where are you getting this information that higher wattage is longer warranty??

    The warranty is per series. Not wattage.

    Corsair, for example:

    VS = 3 years
    CX = 5 years
    SF and TX = 7 years
    All other models, RMx, RMi, HX, HXi, AX, AXi are 10 years.

    https://www.corsair.com/us/en/warranty

    Absolutely no mention of warranty varying based on wattage.

    Seasonic, for example:

    S12II and ECO = 3 years
    M12II and Focus non-modular = 5 years
    Focus semi modular = 7 years
    Focus Plus Series = 10 years
    PRIME = 12 years.

    https://seasonic.com/support#

    Absolutely no mention of warranty varying based on wattage.

    Antec, for example:

    1, 2, 3, 5, 7 and 10 based on series.

    http://store.antec.com/info/antec-warranty

    Absolutely no mention of warranty varying based on wattage.

    So please tell me where you get this out of space idea that warranties vary based on wattage.

    You said it... none of us did. You said "why do they give longer warranties on larger capacity units? such as 750W+?" and I don't see anywhere where that is the case. Then you provide examples that a simple trip to the company's own website proves the absolute opposite.

    Quote Originally Posted by adamsleath View Post
    if the longer warranty is just a marketing measure then all very well. i'm sure you have a very detailed knowledge of psu's...i doubt anyone would question that. i'm all ears.

    it seems the longer warranty comes at a price premium. and no doubt there are many psu's of smaller capacity that may last the 10 year mark...even when they dont have the longer warranty. In Australia there is a more limited choice compared to the u.s. sometimes newegg offers good deals, even free shipping on some items, once the shipping is added however it is often less expensive to buy locally...from the price point of view.

    it might be a false economy to buy some cheaper units. while others might go the distance. i certainly dont know how to ascertain it. so i pay a bit more for the warranty.
    I'm sorry. None of this makes any sense to me at all. What are you trying to say?

    I already said, "a better quality power supply will tend to have a longer warranty." What's hard to understand in that statement? No price premium for warranty blah blah blah. The price premium is that you're getting a better unit and, guesss what? It has a longer warranty.

    Quote Originally Posted by adamsleath View Post
    definitely hard to find a lower capacity psu , in Aus. that have longer warranty periods. seasonic had a 400w fanless unit ...available here at one time, it was pretty pricey, but it may have been a very good unit.
    Sometimes I feel like a broken record sometimes because I have to make this point two or three times a week...

    Better quality power supplies tend to not come in lower wattages because it doesn't cost any less to make a lower wattage PSU than a higher wattage PSU. If you can buy a 750W Platinum for $129.99, do you think there are customers willing to pay $129.99 for a 650W Platinum? $129.99 for a 550W Platinum? No. That would be stupid. Fact of the matter is, output wattage capability is not always the deciding factor in how much it costs to make a PSU. If the BOM cost between building a high quality 550W, 650W and 750W is the same, why would you even bother making the 550W and 650W?
    Last edited by Jon Gerow; 12-10-2018 at 01:34 AM.

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