PSU tier list 2.0

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No wonder my PC has been crashing due to power surges while gaming. I have a CX750M, and recently installed a GTX 970. I think I shall upgrade to the corsair RM750X.
 


In my country 850 B2 coast like $250, and for some reason it's cheaper than 750 B2. I'm willing to buy that 850b2 i guess. What do you think ? 750b2 or 850b2 ?

nvm Just get it, thank's btw.
 


The transient response performance is disappointing, the 12V rail deviates about 3% when a load of 9.25A is applied at 25% of 50% load. Good units are about in the 0.5% deviation territory. Whenever you game, the power is not constant. For a typical GPU, it fluctuates heavily. Look at the GTX 1080, which is actually a very relaxed GPU in terms of power spikes:

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From the looks of it, it spikes about 70W the majority of the time up and down. That is 5.8A right there of transients going on constantly when gaming. Although HardOCP tests at 9.25A, per the ATX spec testing methodology, 5.8A will still cause a voltage drop and the Seasonic Prime's performance in this aspect is mediocre at best. Other graphics cards such as the GTX 980 have much heavier spikes, making transient response a more important consideration when purchasing such a card.


I mean, it's still a great unit, but when it comes to the hefty price you bet you'll pay for it, you want it to be great in every aspect, and it is purely mediocre with transient response, which is a disappointment. Transient response is much more important than progressive load testing in my opinion, because once you are in a game, average power does not change too much but it's the fluctuation that really gets heavy and affects the voltage outputs. This is why I think JG really needs to adopt transient response testing, I'd much rather have that than the less important turn-on transient tests. Just to show you how much these GPUs can spike, look at the R9 290:

HYIxHdI.png


It doesn't matter if voltage regulation is top notch because the voltage will be fluctuating a lot from the transients. This is one aspect in which I believe a tier list falls short, some people need a PSU with better transient response performance, and others may have a more relaxed GPU, so in that situation what PSU is good or not really depends on that person and his or her exact needs and can not be categorized into a tier. To put it in InvalidError's own words, transient response testing is definitely one of the two most important things to be tested. I just wish a $200 unit had better performance in it. Nonetheless, the Seasonic Prime units are good, but they are only somewhat better than the Seasonic Platinum units, which were phenomenal in the first place, but these are nothing groundbreaking. The best thing is the efficiency, with Kitguru measuring over 95% at 50% load.
 


I think it's best to make a post with your specs and budget and ask for a PSU recommendation there. Tiers can only go so far, the perfect PSU depends on you and your exact needs. In addition, you probably don't want to go endlessly down the list looking up every single unit, many of which are not available for sale anymore.
 
There is no "perfect" PSU. There are only suitable, not suitable, good, bad and great quality units. None of them are "perfect", as you know perfectly well. Tiers aren't what matters. The fact that all of the units LISTED on Tiers 1 and 2 are good or great quality units, does. Units listed at Tier 3 or lower are either "meh" or just plain lousy, and shouldn't be paired with a gaming card unless you have no other options.
 
You're right, there is no perfect unit. But I still recommend people ask what some good options are for them, because the tier list will leave them with too many options always which can make the purchasing decision a confusing process, or some units that are on the market today may be absent from the list altogether.
 

That is good to know. I have someone wanting to get a new rig, and they want to get everything from Microcenter. The CX650m may be my best option, to keep costs in check, and get a decent PSU.
 


would the CX750M be good for around $60 used? I need to run na 6-core i7 3930 K and a zotac AMP! edition GTX980
my mobo has an OC genie feature, which is as far as Id go OC-ing any part of it. I don't plan to OC the GPU, but i do plan to run a blu-ray/DVD drive
parts list: http://pcpartpicker.com/list/Hp4RJV
 
As with many things, care must be taken when buying Corsair psus. They love to reuse the same names and designations. There was a prior version of the CX750M and now a new version. If the used unit is a new version, its decent, if it's the old version, its not. Best to get the model number, just CX750M doesn't say much.

If you plan on OC, do the research on that msi board, and OC manually. Software driven OC is a sales gimmick and really not a reliable OC as it tends to mess with everything like BCLK which raises speeds of everything on the buss. Not necessarily a good thing.
 
Buying a used power supply is a bad idea in general but especially with a high end system like that.
 


I looked at an old link , the Silver and Black are the refresh models
http://www.corsair.com/en-us/power-supply-units
Click CXM models.

750w and 850 are there , was the 3 originally , but they are all listed.
 
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