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Thread: How much does Power Supply (PSU) quality affect overclocking?

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    Default How much does Power Supply (PSU) quality affect overclocking?

    Hey guys! I've already read up on this so I have an idea, but I thought it would be beneficial to get some user experience on this. Obviously, a quality PSU will have an effect on system stability, but what should an overclocker really be looking at? I've read some views that say ripple and voltage regulation are both moderately important, but I've also seen comments that lean towards having the best ripple suppression you can get! I'm leaning more towards ripple being really important, but what are your takes on thing like voltage regulation and efficiency. I know efficiency can help with heat, but if the PSU is contained, does that heat really spread to the other components? Let us know about your experiences.

    (I'm really hoping that Ciarlatano chimes in on this as well!!!)

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    Default Re: How much does Power Supply (PSU) quality affect overclocking?

    I think of it like this:

    1. efficiency counts only if running long hours in places like Europe or California where cost of electric is high Heat should be sucked out by the fan so not an issue

    2 Voltage regulation needs to be as good as you can get particularly across the on load range of current you plan for when overclocking. I think the actual voltage measured is less important than the fact it stays at that level as near as possible across a broad load range as possible.

    3. Ripple... Think here of what among other things is called load line calibration You want things to stay as stable as possible with no spikes or sags in the voltage as load is applied or removed. A good supply will have small magnitude spikes etc

    Given that a cpu requires a certain voltage to achieve a certain speed and that the effort to make that as good as possible is happening on the MB Making the MB try to compensate for these PSU foibles in to be avoided

    The PSU is the heart of your rig. Give it the best you can. Audiophiles spend thousands on quality power supplies, sometimes even running off of batteries to ensure pure dc. There might be a lesson there.
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    Default Re: How much does Power Supply (PSU) quality affect overclocking?

    The PSU is the most important part of any PC.

    I like SeaSonic brand the best but I have used a few Corsair units lately. All of them have been good to me.

    This is a good guide to read up on them.

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    Default Re: How much does Power Supply (PSU) quality affect overclocking?

    Grumpy really summed it up well.

    One thing of note - a lot of PSU lines have hold up time drop as the efficiency increases. If you have somewhat inconsistent or dirty power in your house (office, etc) this can become a much bigger deal. This is another spec that is often completely overlooked that deserves consideration.

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    Default Re: How much does Power Supply (PSU) quality affect overclocking?

    Quote Originally Posted by Ciarlatano View Post
    Grumpy really summed it up well.

    One thing of note - a lot of PSU lines have hold up time drop as the efficiency increases. If you have somewhat inconsistent or dirty power in your house (office, etc) this can become a much bigger deal. This is another spec that is often completely overlooked that deserves consideration.
    Is hold up time related to warranty or something else? Hadn't heard of hold up time before.

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    Default Re: How much does Power Supply (PSU) quality affect overclocking?

    Quote Originally Posted by joshjaks View Post
    Is hold up time related to warranty or something else? Hadn't heard of hold up time before.
    Hold up time is the length of time that the PSU can continue to deliver power with no or compromised AC current coming in. If you have inconsistent power, brown outs, etc, it allows the PSU to keep the computer functioning. The last I saw, 16ms was required for ATX spec. If you have AC that dips, it will not only keep the computer from rebooting (it's intended purpose),it will also keep it from crashing due to PSU output power dipping.

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    Default Re: How much does Power Supply (PSU) quality affect overclocking?

    Quote Originally Posted by Ciarlatano View Post
    Hold up time is the length of time that the PSU can continue to deliver power with no or compromised AC current coming in. If you have inconsistent power, brown outs, etc, it allows the PSU to keep the computer functioning. The last I saw, 16ms was required for ATX spec. If you have AC that dips, it will not only keep the computer from rebooting (it's intended purpose),it will also keep it from crashing due to PSU output power dipping.
    Riiiigggghhhttt! Can't believe I didn't remember that.

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    Default Re: How much does Power Supply (PSU) quality affect overclocking?

    Gonna throw a bit of a wild card in here....

    Out there in psu land there are a number of units that are completely overlooked.

    If you are just overclocking your rig then you can continue to overlook these but if you are benching they are worth some consideration...

    What am I talking about here ??? .....Server power supplies.

    Some just supply 12v others provide all the voltages but often need a backplane to get at them easily

    Perhaps it is worth thinking about adding one to an existing supply to provide greater power, especially if benching GPU.

    Two downsides to all of this: Form factor and noise (40mm fan @ 24000rpm anyone?)

    Upside is readily available high efficiency psu's of 1200w to 2400+w for cheap that are designed to keep critical infrastructure running 24/7/365

    I am thinking here of HP common slot which are tiny and HP c7000 psu's that are powerful but a real nasty shape. I am sure others qualify

    This is probably getting away from the point of your first post but hey.... just covering all bases

    Just by the way I have some c7000 psu's here and they run on for maybe 4 seconds after the power is cut. Just recently bought a 490w common slot supply that you cannot hear at idle.... yet to load it up though The common slot idea is that there are 3 supplies all of the same form factor ... 490w, 750w and 1200w in a package around 90x40x210mm secondhand prices range from about $5 upwards
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    Default Re: How much does Power Supply (PSU) quality affect overclocking?

    Honestly, the point of this post was to at least have an easy to find thread with general PSU advice on it. I did some searching, and I know I've seen this kind of stuff on the site before, but I feel like this is great for giving the random google/forum search a great starting point in understanding what PSU to buy.

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    Default Re: How much does Power Supply (PSU) quality affect overclocking?

    OK jj I hear you. Then my recommend s at this time are the platinum and above Seasonics and EVGA's because they seem to tick most if not all boxes.

    If anyone wants to read up on test results for psu's then there are two sites of some interest:

    Silverstone Strider Titanium 600W Review

    and

    Ecova Plug Load Solutions
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    Default Re: How much does Power Supply (PSU) quality affect overclocking?

    Quote Originally Posted by joshjaks View Post
    Honestly, the point of this post was to at least have an easy to find thread with general PSU advice on it. I did some searching, and I know I've seen this kind of stuff on the site before, but I feel like this is great for giving the random google/forum search a great starting point in understanding what PSU to buy.
    Oh....that's easy.

    Buy a Superflower Leadex or Seasonic oem with good cables. You will never be disappointed following that simple rule.

    As a simple rule of thumb, not much more needs to be said than that.

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    Default Re: How much does Power Supply (PSU) quality affect overclocking?

    In a slight counterpoint to GrumpyDaddy's first element, efficiency.

    Efficiency also governs dissipated heat. In other words, if the PSU is rated 92% Efficient @ 50% Load, then 8% of the total current draw is dissipated (directly) as waste heat. So, supposing you had a 1000 Watt PSU with a 500 Watts continuous load and it was 92% efficient, 40 Watts of Waste Heat would be generated. In contrast, an 80% Efficiency PSU would dissipate 100 Watts of waste heat at the same load.

    Now, in most cases, this isn't entirely relevant to your PSU selection decision, as the 100 Watts of waste heat is likely pushed out by the PSU fan...but if your air flow characteristics are poor, or if you are trying for a low noise solution, then an extra 100 Watts of heat is a significant issue. Further, if your case is shoved under your desk, the dumping of 100 Watts of heat from the CPU Alone (not to mention the heat being shoved out of the box by your CPU, Video Card, Chipset, etc) could be a significant detriment to the comfort of your tootsies in a long gaming session. Or, a significant benefit if you live in a cold clime, like Alaska, Canada, Lapland, Norway, Scotland, or my house when I've spent too long on said Gaming machine and the Mrs is upset.

    Otherwise, as others have recommended, a PSU of reasonable efficiency from a reputable manufacturer like Seasonic is worth every penny.

    One final point. I've worked with electronics of varying qualities for years (decades), and one of the things my maintenance techs always told me when diagnosing failures in solid state systems: "99% of the time it's the Power Supply". Buying a quality power supply for your PC reduces that 99% figure significantly. Today's PC's are astonishingly resilient and reliable, but poorly regulated voltage, dirty power, and over stressed PSU's can increase your likelihood of system failure dramatically.

    To paraphrase a many faceted meme: "Friends don't let Friends buy **** Power Supplies".

    Scott

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    Default Re: How much does Power Supply (PSU) quality affect overclocking?

    I would highly recommend EVGA they are as good as Seasonic

    this is the one I am currently using

    http://www.evga.com/Products/Product...220-P2-1200-X1

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    Default Re: How much does Power Supply (PSU) quality affect overclocking?

    Quote Originally Posted by vinman View Post
    I would highly recommend EVGA they are as good as Seasonic

    this is the one I am currently using

    EVGA - Products - EVGA SuperNOVA 1200 P2 Power Supply - 220-P2-1200-X1
    The P2, G2, B2 &T2's are all SuperFlower and the GS's are Seasonics. Some of their other models are HEC and FSP (Fortron Source). As long as you stick with the SuperFlower Models or the SeaSonics, EVGA's are fantastic and well priced.

    S.

    A good table for identifying said models is: http://www.orionpsudb.com/evga

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    Default Re: How much does Power Supply (PSU) quality affect overclocking?

    Quote Originally Posted by Gu3 View Post
    The P2, G2, B2 &T2's are all SuperFlower and the GS's are Seasonics. Some of their other models are HEC and FSP (Fortron Source). As long as you stick with the SuperFlower Models or the SeaSonics, EVGA's are fantastic and well priced.

    S.

    A good table for identifying said models is: EVGA - PSU Platform Database
    I think I should put a plug here too recommending Jonny Guru for PSU reviews. He's had really good things to say about EVGA units as of late. Always says good things about Seasonic.

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    Default Re: How much does Power Supply (PSU) quality affect overclocking?

    Quote Originally Posted by joshjaks View Post
    I think I should put a plug here too recommending Jonny Guru for PSU reviews. He's had really good things to say about EVGA units as of late. Always says good things about Seasonic.
    But.....you also need to take their Corsair reviews with a huge grain of salt. Jonny works for Corsair.

    My statement "Buy a Superflower Leadex or Seasonic oem with good cables. You will never be disappointed following that simple rule." should actually be read as "buy an EVGA P2, G2 or GS, or a BQ Dark Power Pro". Just didn't want to advertise. The GS and DPP are better than anything Seasonic markets under their own name (or oem for anyone else) and the P2/G2 are the incredible Leadex units with the fan control tweaked.

    Personally, anything with flat cables is a complete turn off. If the mfg is skimping that badly on parts you can see (you need to realize that the flat cables are only used because they are so incredibly cheap to manufacture), can you imagine what is going on inside the unit? It is not always true (the CM V series are very close to the BQ), but it gives you a good heads up that corners are being cut.

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