Corsair Vs Series Vs Cx Series - Power Supplies - Linus Tech Tips

• Gitesh

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What is difference between corsair vs650 and cx650 psu.

Cx-series is around 25$ more than vs-series but what is main advantage?       

i usually don't care about modular vs non modular type anyway.

Is there any advantage for sending 25$ more for same power,same company psu?

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• Vandorlot

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The CX has better efficiency which will help with oc's as well as temperatures but it will be a slight difference. I would go with the CX.

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• powerplayer75

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^ on top of what he said, since its more efficient it'll probably be quieter

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• TheKDub

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Between the two, get the CX. However, there are much better options out there.

I'd highly recommend going with the CX650M over the CX650. Semi-modular is infinitely better to work with than non-modular.

It's a little older of a model, but I've been using the CX600M for four years now without any major issues, though with my upcoming rig update, I'll be moving to an EVGA 850 G3.

Specs: CPU - Intel i7 8700K @ 5GHz | GPU - Gigabyte GTX 970 G1 Gaming | Motherboard - ASUS Strix Z370-G WIFI AC | RAM - XPG Gammix DDR4-3000MHz 32GB (2x16GB) | Main Drive - Samsung 850 Evo 500GB M.2 | Other Drives - 7TB/3 Drives | CPU Cooler - Corsair H100i Pro | Case - Fractal Design Define C Mini TG | Power Supply - EVGA G3 850W

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• RAM555789

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I've heard bad stuff about both PSU's and would stay clear of them, however of the two from what I've gathered the CX is a bit better.

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• Jurrunio

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newer CX are decent

old CX and VeryShit unit should be avoided, mostly for durability reasons.

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• Spotty

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What system are you building? Why do you need 650W? 550W is enough for an 8700k + 1080ti. If you want dual GPUs (which you shouldn't cause SLI/Crossfire is dead) you're better off with 750W + If you post the rest of your system parts we may be able to recommend a more appropriate PSU. The new grey label CX series PSUs use better quality components than the VS series. The VS series is Corsairs cheap budget offering. That is the reason for the cost difference. Of those two options, you should buy the grey label Corsair CX/CXM.  

19 minutes ago, Vandorlot said:

The CX has better efficiency which will help with oc's as well as temperatures but it will be a slight difference. I would go with the CX.

15 minutes ago, powerplayer75 said:

^ on top of what he said, since its more efficient it'll probably be quieter

Efficiency ratings are a rating of power efficiency. They don't rate noise, temperature, or overclockability. An 80+ Platinum PSU could be noisier than an 80+ Bronze PSU. It's more due to the quality of the fan, the internal layout of the PSU, as well as features like semi fanless modes or better fan profiles.

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• Elamontel
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• powerplayer75

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5 minutes ago, Spotty said:

What system are you building? Why do you need 650W? 550W is enough for an 8700k + 1080ti. If you want dual GPUs (which you shouldn't cause SLI/Crossfire is dead) you're better off with 750W + If you post the rest of your system parts we may be able to recommend a more appropriate PSU. The new grey label CX series PSUs use better quality components than the VS series. The VS series is Corsairs cheap budget offering. That is the reason for the cost difference. Of those two options, you should buy the grey label Corsair CX/CXM.  

 

Efficiency ratings are a rating of power efficiency. They don't rate noise, temperature, or overclockability. An 80+ Platinum PSU could be noisier than an 80+ Bronze PSU. It's more due to the quality of the fan, the internal layout of the PSU, as well as features like semi fanless modes or better fan profiles.

youre right about all that but if its more efficient then less wasted heat will be given off per a certain amount of power passed through a PSU, therefore the fan will have to kick on less since there is less heat to cool and it'll be quieter compared to a less efficient PSU (also, generally higher efficiency PSU's come with a bunch of those features anyway)

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• Spotty

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10 minutes ago, powerplayer75 said:

youre right about all that but if its more efficient then less wasted heat will be given off per a certain amount of power passed through a PSU, therefore the fan will have to kick on less since there is less heat to cool and it'll be quieter compared to a less efficient PSU

I understand your logic, but the difference between a 80+ White unit and an 80+ Bronze unit isn't that severe and may only be 1% difference in efficiency rating, so the difference in temperature/heat output as a result of efficiency value alone may not be significant. The PSU efficiency ratings require a unit to meet a certain percentage of efficiency at varying levels of load (20%, 50%, 100%). This means it is possible for a white unit to be more efficient under some loads than a bronze unit. For example, a white unit may be 84% efficient at 20% and 87% efficient at 50% load, but only 80% efficient at 100% load. While it meets the requirements for Bronze rating at 20% and 50% load, it doesn't meet the requirements for Bronze rating at 100% load, and as such can't be classified as 80+ Bronze. Meanwhile, a Bronze unit may have 82% efficient at 20% load, 85% efficiency at 50% load, and 82% efficiency at 100% load, which will qualify it for Bronze rating. In that [exaggerated] example, the white unit would be more efficient than the bronze in a more typical range (20-50% load), even though it doesn't meet the Bronze standards.(This probably isn't the case for the VS series vs CX series PSUs, and I actually don't know what the VS efficiency curve looks like, but still worth mentioning in general) You can't judge how loud a unit is or how much heat it will produce based on its 80+ efficiency rating. The CX series should* be quieter than the VS series, but that's not due to efficiency ratings, but instead due to the CX series using quieter fans*. The new grey unit CX series (Not CXM or older green CX) uses rifle bearings in its fan, while the VS series uses sleeved bearings. Typically fans with rifle bearings are quieter than an equivalent sleeved bearing fan.(*In theory. I haven't stuck my ear next to both units to test. Other things like different fan profiles and fan blade design will also contribute to noise)

Unless you get your hands on both units and measure the noise output of each with a decibel metre, you're not going to be able to know for sure which is louder. Most decent reviewers will include noise measurements in their reviews of power supply units, so if you're concerned about how loud a unit will be, the best thing to do is to check out reviews for each unit that measure and test how loud it is.@Gitesh What parts does your system have? What CPU and what GPU? You likely don't need 650W. You may be better off with a Corsair CX450M which will be the same price as the VS650, but better quality.

CPU: Intel i7 6700k  | Motherboard: Gigabyte Z170x Gaming 5 | RAM: 2x16GB 3000MHz Corsair Vengeance LPX | GPU: Gigabyte Aorus GTX 1080ti | PSU: Corsair RM750x (2018) | Case: BeQuiet SilentBase 800 | Cooler: Arctic Freezer 34 eSports | SSD: Samsung 970 Evo 500GB + Samsung 840 500GB + Crucial MX500 2TB | Monitor: Acer Predator XB271HU + Samsung BX2450

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• Vandorlot

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9 hours ago, Spotty said:

Efficiency ratings are a rating of power efficiency. They don't rate noise, temperature, or overclockability. An 80+ Platinum PSU could be noisier than an 80+ Bronze PSU. It's more due to the quality of the fan, the internal layout of the PSU, as well as features like semi fanless modes or better fan profiles.

Worse efficency would mean the PSU send's variable amounts of voltage and there is more fluctuation in the current so it would  result in less stability in overclocks.

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CPU - Ryzen 5 [email protected]          GPU - XFX XXX RX580 8g          Cooler - Arctic Freezer 33 eSports edition green          Motherboard - Gigabyte AB350 Gaming 3          Ram -  G.Skill 2x8 Ripjaws 5 2666                   Case - Pahntecs P400s TGE Modded with Green accents          PSU - Seasonic M1211 evo 620w          SSD - Samsung 960 evo 500 GB          HDD - Seagate Barracuda 7200rpm 2tb       

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• OrionFOTL

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20 minutes ago, Vandorlot said:

Worse efficency would mean the PSU send's variable amounts of voltage and there is more fluctuation in the current so it would  result in less stability in overclocks.

Efficiency has ABSOLUTELY NO CONNECTION to the quality of output power.

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• seon123

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18 minutes ago, Vandorlot said:

Worse efficency would mean the PSU send's variable amounts of voltage and there is more fluctuation in the current so it would  result in less stability in overclocks.

The efficiency has nothing to do with how the output is. Or are you telling me that the Strider Titanium is better than the G3?

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• STRMfrmXMN
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• STRMfrmXMN

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26 minutes ago, Vandorlot said:

Worse efficency would mean the PSU send's variable amounts of voltage and there is more fluctuation in the current so it would  result in less stability in overclocks.

No.

10 hours ago, Gitesh said:

What is difference between corsair vs650 and cx650 psu.

Cx-series is around 25$ more than vs-series but what is main advantage?       

i usually don't care about modular vs non modular type anyway.

Is there any advantage for sending 25$ more for same power,same company psu?

The CX was updated in 2015(?) with a grey label on the side and a radically different platform. It's actually quite good nowadays, especially for the money. The VS is for low-end builds, as it always has been.

My account is almost entirely dormant. Hope you all are having a grand time. Many years of fun were had here.

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• Guest

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10 hours ago, Vandorlot said:

The CX has better efficiency which will help with oc's as well as temperatures but it will be a slight difference. I would go with the CX.

21 minutes ago, Vandorlot said:

Worse efficency would mean the PSU send's variable amounts of voltage and there is more fluctuation in the current so it would  result in less stability in overclocks.

No.  That is completely wrong!!!!!  Where do you get your information from?!!?!? CHRIST!!!!!  It amazes me.  You guys have the most B.S. answers and are so confident in them that you're willing to mislead people by responding to their posts.

All lower efficiency means is it uses more AC power to produce the same amount of DC power.

And better efficiency does not help OC.   AT ALL.

What you ARE correct about it lower temperatures.  If more AC is used, but isn't converted to DC power, what is it converted into?  Heat.  But that shouldn't make your whole PC hotter. Since the PSU fan is an INTAKE (sucking air into the PSU housing), and the thermostatic control is in the PSU itself, that typically just means the PSU fan will have to run faster to exhaust that heat. 

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10 hours ago, TheKDub said:

Between the two, get the CX. However, there are much better options out there.

 

I'd highly recommend going with the CX650M over the CX650. Semi-modular is infinitely better to work with than non-modular.

 

It's a little older of a model, but I've been using the CX600M for four years now without any major issues, though with my upcoming rig update, I'll be moving to an EVGA 850 G3.

Actually, if we're talking about the gray label CX, it's better than the CX-M.

The CX has an LLC topology.  Responds better to transient loads from high end graphics cards (like 1080 Ti or Vega 64) and has a more flat efficiency curve because the switching frequency changes with load.

And yes.. a G3 850 is a better PSU... but it also costs a lot more than what the OP is looking at.     You get what you pay for. 

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• Guest

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10 hours ago, Gitesh said:

What is difference between corsair vs650 and cx650 psu.

Cx-series is around 25$ more than vs-series but what is main advantage?       

i usually don't care about modular vs non modular type anyway.

Is there any advantage for sending 25$ more for same power,same company psu?

CX is more efficient, so it uses less power and runs cooler.  If it's the newer gray label CX (not CX-M), it can support higher end graphics cards and will also have less transformer whine (VS and CX-M use double forward topology).  Also, CX and CX-M use DC to DC for the +3.3V and +5V so they support the newer (X99 and newer chipsets) sleep states that are typically so low that the PSU crossloads and shuts off instead of going into standby.

Also warranty.  VS is three years.  CX is five years.

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• awesomegamer919

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11 hours ago, STRMfrmXMN said:

No.

 

The CX was updated in 2015(?) with a grey label on the side and a radically different platform. It's actually quite good nowadays, especially for the money. The VS is for low-end builds, as it always has been.

CXm was updated in 2015, CX was updated in 2017

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