What PSU will plug into my motherboard? Don't know what connection I need and size etc? Also which one to buy?

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Tronlo

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May 26, 2016
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Basically my old PSU seems to be breaking. I experienced freezes and restarts when I play a game for couple of minutes and sometimes straight after I run it. I also have shut down my pc last night and my mouse light stayed on making me think that it definitely is the PSU but correct me if you think it may be a fault of other component.

I also tried to look at the cabling but basically its just a bundle of tied up wires that go inside the actual PSU case so I can't see what is going on there. This PC is also about 5-6 years of age and my old pc's power supply also went with the wind around that age so I wouldn't be surprised this one is going.

I have had the following PSU over the years: The FSP450-60APN(85)
http://www.fsp-group.com.tw/index.php?do=proinfo&id=1682
So anything that has same compatibility (like cables connection and so on are the same) and size also so it fits in my case is great.

I don't exactly know what I am looking for when it comes the pricing and generally the quality of the PSU. It is important that it lasts me long though, so maybe a durable one. What I have seen so far on Amazon is that the prices go up to about £100 for best ones that give about 550W. I am thinking I wouldn't really mind spending about £70 but I don't really feel like I need the best one since my graphics card and processor ain't so demanding - I got Radeon HD 6700 Series and AMD FX-8120 8core processor, 8GB of ram. I may be looking to upgrade the ram and graphics card maybe to 16GB of ram and GTX 970/R9/GTX 750 Ti so let me know if your choice is compatible with these...

Thank you for all your help and sorry that my post turned out to be a bit long.
 
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turkey3_scratch
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basroil

basroil

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If you want to upgrade to a 970 or 380(x), then a 650W PSU is recommended, EVGA G2 line or XFX TS /Seasonic Gold generally are more than enough. For 960/370 or lower, you can get away with 500W and a 750Ti doesn't need more than 430W even with an overclocked 9590!
 
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Tronlo

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How about EVGA GQ 750..?
 
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basroil

basroil

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Absolutely not! The only GQ that is any good is the 850W version, the 750/650 (exact same thing actually) is absolute garbage. Go with the G2, you won't regret spending an extra $10 on it!
 
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Tronlo

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I actually ended up buying the GQ because it was the best one available in the store and I needed it now. I can't just wait 2/3 days without pc that's torture. Anyway, I've been told its tier 2 so why is it so bad..? How would it help my PC if I got a better one if this one does the job?
 
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turkey3_scratch

turkey3_scratch

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The 750 GQ downfall is high ripple on the 3.3V and 5V rails, as seen in the ripple crossload graphs here: http://www.tomshardware.com/reviews/evga-gq-series-750w-psu,4396-6.html

It also fails the 3.3V rail transient response test: http://www.tomshardware.com/reviews/evga-gq-series-750w-psu,4396-7.html

The 650 GQ is just an average unit. I'd say above average actually. http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story4&reid=454

No single GPU that you buy will put enough load anyway on the 750 GQ (if you got that one) to cause out-of-spec ripple. As for the transient response, nothing end-of-the-world in my mind, but it is subject to opinion.
 
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Tronlo

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Sorry but sadly I don't understand anything you're saying about the ripple or transient response and how it affects anything. I am a very basic person, knowing the basic stuff. Maybe you got a dummy explanation that you can give me?
 
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turkey3_scratch

turkey3_scratch

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Best I point you to an article. Here is a good explanation of ripple http://www.hardwaresecrets.com/everything-you-need-to-know-about-power-supplies/11/
Besides that, the power supply must be able to deliver a “clean” output. In a perfect world, the voltages on the power supply outputs would draw a single horizontal line when seen on an oscilloscope. But in the real world, they aren’t perfectly straight; they present a little oscillation, called ripple. On top of this oscillation you can see some spikes or noise. Ripple and noise together cannot exceed 120 mV on the +12 V outputs, and 50 mV on the +5 V and +3.3 V outputs. These values are peak-to-peak values.
Read more at http://www.hardwaresecrets.com/everything-you-need-to-know-about-power-supplies/11/#Z95dEXKF70kx1C5g.99
Click to expand...
Basically, there is voltage oscillation left over from when it was alternating current/voltage. A power supply converts AC to DC, and after the conversion, there is still some oscillation left over. The less oscillation, the better. The 750 GQ has some higher oscillation on its 5V and 3.3V wires. What can it affect? It won't affect the performance of the computer, it just can affect how long the attached hardware will last. For instance, higher ripple makes the voltage regulator modules of things like the GPU and motherboard heat up. A voltage regulator module is just another power supply. Yes, GPUs and motherboard have power supplies, too. When stuff gets hotter, its lifespan decreases.

Transient response is how the voltage outputs react to sudden load changes. So going from low load to high load very quickly will cause a voltage drop, and on the 750GQ, the 3.3V voltage goes below 3.14V, which is the bottom limit for the ATX specification.

If you own the 750GQ, there is no need to be concerned. Your PSU won't be stressed to pose high enough ripple. And the 3.3V rail is the least important rail, and most power supplies do quite poorly with 3.3V transient response anyway. Also, having a sudden load change on the 3.3V rail is not very realistic either.
 
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basroil

basroil

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Transient = power spikes. A higher end card will have higher power spikes, and bad power supplies shut down when power spikes are too large for it to handle. The PSUs I listed above. EVGA G2, XFX TS Gold, Seasonic Gold will handle the power spikes from even a 980Ti and Fury X.
 
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