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    Re: My new Build Project, with

    Quote Originally Posted by MrJim View Post
    That's power consumption whilst gaming though - I would expect the power consumption would be much higher if one were doing other workloads that might use AVX instructions, e.g rendering. I would expect 450W would be a bit close for my liking.
    That's true, and I would personally like a bigger PSU for a bit of thermal margin too. A 450W PSU with the fans flat out will generally be noisier than a 650W at medium load (if you choose carefully) and the bigger PSU should run fanless for longer as well.

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    Re: My new Build Project, with

    Quote Originally Posted by MrJim View Post
    That's power consumption whilst gaming though - I would expect the power consumption would be much higher if one were doing other workloads that might use AVX instructions, e.g rendering. I would expect 450W would be a bit close for my liking.
    Even with AVX the CPU won't be anywhere near 300 W, and it's unusual to try and CPU render while gaming. It's just a 225 W GPU (post XT bios flash), that's plenty of spare capacity for a 105 W (at stock) CPU. The figure is also power from the wall, accounting for PSU inefficiency it's under 400 W on the 12 V side.

    Quote Originally Posted by DanceswithUnix View Post
    That's true, and I would personally like a bigger PSU for a bit of thermal margin too. A 450W PSU with the fans flat out will generally be noisier than a 650W at medium load (if you choose carefully) and the bigger PSU should run fanless for longer as well.
    Loud enough to be heard over the CPU and GPU coolers? Any decent PSU will comfortably be inaudible under full load, as the stuff cooling the silicon has a much harder job (~10x more heat, and more concentrated). Bigger PSUs will have a higher fanless load if they support semi-passive operation, but 550 W semi passive units claim they're good for ~200 W or so - that's plenty of power for the rest of the system to drown it out.

    You also tend to find strong similarities between PSUs in the same range, with the lower capacity units having very similar setups just with the fan running slower for the lesser heat load. Going down to SFX is a different matter, of course

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    Evil Monkey! MrJim's Avatar
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    Re: My new Build Project, with

    Well if it were me spending around £2,000 on a new PC, I personally wouldn't 'cheap out' and spend about £50 on 450W PSU. The better quality PSUs tend to start at around the 650W mark it would seem, and that capacity PSU would allow for future system upgrades too (since most good PSUs have 10 year warranties or more, and tend not to be changed every upgrade cycle).

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    Re: My new Build Project, with

    On the PSU front I have a EVGA 750W SuperNova G2, absolutely rock solid, and quiet too, fans don't come on unless PSU goes over a certain temp and in all the time I have used my PC never seen the fan come on once, and yes it does work as there is a switch where you can choose to have the fan on all the time if you want

    Never buy a cheap PSU
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    Re: My new Build Project, with

    Quote Originally Posted by Jonj1611 View Post

    Never buy a cheap PSU
    Very much this. The OP had a lucky escape to have had a bad PSU from an unknown brand without it burning his motherboard or other components. I've had a Hiper PSU go pop and damage my motherboard in the past and a Q-tec one just fail by making my PC turn off while I was in the middle of working on something which could have lost work and data and corrupted Windows.

    Get this one, looks like there is stock: https://uk.pcpartpicker.com/product/...y-focus-px-650
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    Re: My new Build Project, with

    I did think about going down to less that 650W, and know that I could probably get away with 550W, but that would give me little headroom at full output and so too low a margin of error. 650W gives me a comfortable headroom for all that I intend to do, which certainly isn't just gaming. It also builds in some future proofing given AMD's support for the AM4 socket over the next year or more. There's a nice PSU reckoner on the be quiet! website which allows you to add your components in and it calculates how much power you'll need, which I used to decide on a 650W

    I've actually ordered the replacement PSU, which will be a be quiet! Straight Power 11 650W 80 Plus Platinum Modular PSU. Chosen for design, acoustically quiet modus operandi and it has enough connectors to supply both 8-pin CPU sockets that the Auros Master has. Also, there really wasn't much left in the OCUK CV19-ravaged product range to chose from. It will be with me on Wednesday.

    In the meantime, OCUK have agreed to RMA the old one and refund the price.

    Tomorrow I'll update you all on how I improved the X570 chipset heatsink - I've read too many complaints on different forums about the potential irritation of the chipset fan coming on. On the board it's also located very close to being completely overhung by the end of the GPU in the first PCIe slot. I therefore wanted to improve its passive thermal performance to minimise the chances the fan will come on.

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    Re: My new Build Project, with

    Quote Originally Posted by Ciber View Post
    Very much this. The OP had a lucky escape to have had a bad PSU from an unknown brand without it burning his motherboard or other components. [/url]
    Indeed - a lucky escape. The new PSU is 67% more expensive!

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    Re: My new Build Project, with

    A decent 550W PSU powered my mates overclocked FX6350 and R9 390 for 5 years fine. Quality and the number of amps the PSU can deliver are more important than pure wattage. For instance I use a 450W Corsair SF450 to power my stock Ryzen 5 2600 and GTX1080FE,as Corsair used the 400W SF400 to power a Core i7 7700K and a GTX1080FE in one of their own SFF systems. So I would aim for a decent 500W~600W PSU.

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    Re: My new Build Project, with

    A PSU operates most efficiently at 50% load (ie. your PC is currently drawing 325W meaning a 650W would be best) so take that into consideration.

    Get the best PSU you can afford.

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    Re: My new Build Project, with

    Quote Originally Posted by MrJim View Post
    Well if it were me spending around £2,000 on a new PC, I personally wouldn't 'cheap out' and spend about £50 on 450W PSU. The better quality PSUs tend to start at around the 650W mark it would seem, and that capacity PSU would allow for future system upgrades too (since most good PSUs have 10 year warranties or more, and tend not to be changed every upgrade cycle).
    It's not cheaping out to only buy the PSU capacity that you need. A no-name brand PSU is asking for trouble, no matter the capacity, while something like this (gold rated, 7 year warranty, and a decent manufacturer):
    https://www.scan.co.uk/products/450w...mm-fan-atx-psu
    Would do the job just fine. There's plenty of high-quality PSUs at lower wattages (EVGA even does a semi-passive one at 450 W) - it's got enough spare capacity to go up to any single GPU card on the market and a 16 core processor, what more do you want? It won't be enough for a top end workstation CPU, but not many 650 W units that have enough 8 pin connectors for that either

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    Re: My new Build Project, with

    Quote Originally Posted by MagicWok View Post
    A PSU operates most efficiently at 50% load (ie. your PC is currently drawing 325W meaning a 650W would be best) so take that into consideration.

    Get the best PSU you can afford.
    It does, but that means a 650 W model is even further from the best efficiency range when you're web browsing

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    Re: My new Build Project, with

    Quote Originally Posted by Xlucine View Post
    It does, but that means a 650 W model is even further from the best efficiency range when you're web browsing
    Not really with modern PSUs which are designed to work like that. Old ATX PSUs, sure.

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    Re: My new Build Project, with

    be careful with the 650w and under models - not all have two mobo powersupply connectors which is recommended for your x570. Speculation is they will become more important with future chips. You can run the board on just one connector but the motherboard manual says use two. I found i had to get 750w to get something with both connectors

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    Re: My new Build Project, with

    Quote Originally Posted by ik9000 View Post
    be careful with the 650w and under models - not all have two mobo powersupply connectors which is recommended for your x570. Speculation is they will become more important with future chips. You can run the board on just one connector but the motherboard manual says use two. I found i had to get 750w to get something with both connectors
    Those connectors are supposed to be maximum 7A per terminal. 8 conductors is 4 pairs (what comes out one yellow wire loops back in a black ground wire) so that's 4x7 = 28A total, which at 12V would be 336W. That's the point you risk melting it, but I expect for most of us our cpu cooler will have given up before we hit the limit of a single 8 pin connector.

    In case the internet lied to me about the current rating of that molex connector (the Internet is always right, isn't it?) a rough estimate is that the rather similar PCIe 8 pin PEG connector is conservatively rated at 150W, but one of the connectors is a sense line not for power delivery so you only get three pairs from the possible 4. So scaling the 50W per pair for 6 active cables an 8 pin connector should allow 200W.

    So that single 8 pin connector should deliver 200W all day no problem, possibly up to 300W. Driving even the bigger Ryzen chips from an old 4 pin EPS connector should be possible, but peaks will be on the limit.

    If you intend using PBO overclocking where the motherboard will tell the CPU that it can deliver an unholy deluge of power, then it might be wise to connect it all up so it isn't lying. But then most of us don't overclock.

    OTOH, if you have two 8 pin power connectors then I think it would look nice to have them both in use. But then I drive a car that really doesn't need twin exhausts at the back

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    Re: My new Build Project, with

    Quote Originally Posted by ik9000 View Post
    be careful with the 650w and under models - not all have two mobo powersupply connectors which is recommended for your x570. Speculation is they will become more important with future chips. You can run the board on just one connector but the motherboard manual says use two. I found i had to get 750w to get something with both connectors
    This is what I've ordered: https://www.overclockers.co.uk/be-qu...ca-141-bq.html

    It certainly seems to be specified for two CPU 8-pin plugs.

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    Re: My new Build Project, with

    Quote Originally Posted by Xlucine View Post
    It does, but that means a 650 W model is even further from the best efficiency range when you're web browsing
    These are figures for the 650W PSU I've ordered:

    80 PLUS certification - Platinum

    Efficiency at 230V, 20% load - 92.4%

    Efficiency at 230V, 50% load - 93.7%

    Efficiency at 230V, 100% load - 92.6%

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