What PSU should I buy?

Eng_Heisenberg · Oct 1, 2016

Hi

I was decided to buy an EVGA Supernova p2 650W, but, after I read some reviews about this model, I discovered that it doesn't have over temperature protection (OTP). Should I be worried about this detail and buy another PSU?

Well, then I looked at the Corsair RM650i. It is as good as evga with ripple suppression, but there isn't a bypass relay to keep the thermistor cool, so I think it is not a good choice (correct if I am wrong). Then I looked the Seasonic x650. It has OTP, bypass relay, but the ripple suppression is not as good as the evga and corsair. So, I can't find the perfect 650w psu. What should I do?

Thanks very much =)

badboyrog2 · Oct 1, 2016

check with XFX XTR series

Dark Lord of Tech · Oct 1, 2016

Get a RMx from Corsair.

Ten year warranty

Your guarantee of reliable operation that will last across several system builds.

Eng_Heisenberg · Oct 1, 2016

But I think the inrush protection is not good since it does not have a bypass relay to keep the thermistor cool(Correct me if I am wrong).

turkey3_scratch · Oct 1, 2016

Eng_Heisenberg :

This is nitpicking to the max. And if you turn on your computer when it's been off all night the thermistor will already be cool. In addition, inrush current does not affect the PSU in anyway, it simply could trip a circuit breaker, but the RMx inrush current is fine.

Dark Lord of Tech · Oct 1, 2016

Exactly I agree Turkey , you can't lose with the EVGA P2 or RMx.

Eng_Heisenberg · Oct 1, 2016

turkey3_scratch :

Yeah, but, for example, if the power in my house suddenly goes down and and is reestablished seconds after, the termistor wouldn't be cool then the inrush current would be much greater, causing issues to the PSU, right?

Dark Lord of Tech · Oct 1, 2016

From EVGA site:
https://www.evga.com/articles/00722/

EVGA Standard Power Supply Safety Protections include:

OPP (Over Power Protection)
Protection from when a power supply exceeds its maximum rated capacity.
OVP (Over Voltage Protection)
Continuously checking the voltages at each rail point and will kick in if they surpass their set limits.
UVP (Under Voltage Protection)
Continuously checking the voltages at each rail point and will kick in if they surpass their set limits.
SCP (Short Circuit Protection)
Continuously monitoring the output rails and looks for impedance rates less than 0.1, if detected it immediately shuts down.
OCP (Over Current Protection)
Protects when the current in the rail goes beyond its limit.
OTP (Over Temperature Protection)
Added Thermistor's to heat sinks provides real time monitoring for protection and better fan control. When exceeded, the power supply shuts down.

Eng_Heisenberg · Oct 1, 2016

What is your opinion about the lack of over temperature protection in supernova p2 and lack of bypass relay in rmx to keep the thermistor cool?

Dark Lord of Tech · Oct 1, 2016

Aready did.

Eng_Heisenberg · Oct 1, 2016

From EVGA site:
https://www.evga.com/articles/00722/

EVGA Standard Power Supply Safety Protections include:

OPP (Over Power Protection)
Protection from when a power supply exceeds its maximum rated capacity.
OVP (Over Voltage Protection)
Continuously checking the voltages at each rail point and will kick in if they surpass their set limits.
UVP (Under Voltage Protection)
Continuously checking the voltages at each rail point and will kick in if they surpass their set limits.
SCP (Short Circuit Protection)
Continuously monitoring the output rails and looks for impedance rates less than 0.1, if detected it immediately shuts down.
OCP (Over Current Protection)
Protects when the current in the rail goes beyond its limit.
OTP (Over Temperature Protection)
Added Thermistor's to heat sinks provides real time monitoring for protection and better fan control. When exceeded, the power supply shuts down.

Hi, if you check the p2 650 page, you will find that there is not OTP, but just the oter protections (OPP, OVP, UVP, SCP and OCP)

I found OTP just in supernova T2 series

Eng_Heisenberg · Oct 1, 2016

But the lack of OTP could be dangerous to the PSU, or not?

turkey3_scratch · Oct 1, 2016

Eng_Heisenberg :

Yeah I don't think any of the G2s and P2s have OTP. I know Aris thinks OTP is a very vital protection, so I guess it depends. I guess if the fan fails and the computer is under load and is intaking heat from things like GPU and CPU exhaust, that could indeed result in something bad.

According to the Toms and TPU reviews of G2 and P2 units, Aris did not list any of them having OTP, contrary to EVGA's website's claims. I believe Aris since he actually tests these things. Also, a bypass relay is primarily used for increasing efficiency.

Dark Lord of Tech · Oct 1, 2016

I own the 1000w P2 , amazing PSU.

Eng_Heisenberg · Oct 1, 2016

turkey3_scratch :

Eng_Heisenberg :

Yeah I don't think any of the G2s and P2s have OTP. I know Aris thinks OTP is a very vital protection, so I guess it depends. I guess if the fan fails and the computer is under load and is intaking heat from things like GPU and CPU exhaust, that could indeed result in something bad.

According to the Toms and TPU reviews of G2 and P2 units, Aris did not list any of them having OTP, contrary to EVGA's website's claims. I believe Aris since he actually tests these things. Also, a bypass relay is primarily used for increasing efficiency.

Well, maybe buying a PSU with more power capacity could help to keep the PSU cool in stress situations.

Dark Lord of Tech · Oct 1, 2016

They shouldn't have that listed on their site if it's not true , join the forum and ask , they answer quickly.

turkey3_scratch · Oct 1, 2016

EVGA's website does not say OTP for the P2s it seems http://www.evga.com/Products/Product.aspx?pn=220-P2-1000-XR

It seems once you hit the 750 G2 the G2s thereafter have OTP http://www.evga.com/Products/Product.aspx?pn=220-G2-0750-XR strange how the 750+ G2s have OTP but not any of the P2s.

Eng_Heisenberg · Oct 1, 2016

https://www.evga.com/Products/Product.aspx?pn=220-P2-0650-X1

Heavy-duty protections, including OVP (Over Voltage Protection), UVP (Under Voltage Protection), OCP (Over Current Protection), OPP (Over Power Protection), and SCP (Short Circuit Protection)

See, there is not OTP.

BTW, my case has 5 fans, probably it could not be a problem, I realy dont know.

badboyrog2 · Oct 1, 2016

did you red my post?
see the link here
http://xfxforce.com/en-us/products/xtr-series-gold-full-modular/xtr-series-750w-psu-p1-750b-befx
Safety & Protection

Active Power Factor Correction (PFC) : Y

Over Current Protection (OCP) : Y

Over Power Protection (OPP) : Y

Over Tempurature Protection (OTP) : Y

Over Voltage Protection (OVP) : Y

Short Circuit Protection (SCP) : Y

Under Voltage Protection (UVP) : Y

turkey3_scratch · Oct 1, 2016

Hmm interesting how TPU says the 750 G2 has no OTP but EVGA's website does https://www.techpowerup.com/reviews/EVGA/SuperNOVA_G2_750/2.html

Ehh, who knows. But it's not something to worry about IMO, if it was really a dire problem they'd have it.

Dark Lord of Tech · Oct 1, 2016

They should remove the generalization from the buyers guide , it's misleading , shouldn't say standard feature unless it's all of them.

Eng_Heisenberg · Oct 1, 2016

Well, my case has 5 fans, so probably inrush protection should be my priority. evga supernova p2 has bypass relay.

Lets see. My computer should consume around 320w at max load:

i7 6700
asus gtx 1070 founders edition
32gb ram hyperx fury 2133 mhz
MB asus z170m plus
5 fans
1 480gb ssd

So, if a buy a 750w p2, it would be cool I think.

Dark Lord of Tech · Oct 1, 2016

I bet it has some kind of OTP built in the fan controller , there's no way there's not some sort of thermal protection with PSU's of those caliber.

Eng_Heisenberg · Oct 1, 2016

It seems a good choice to keep the PSU cool:

https://www.amazon.com/EVGA-SuperNOVA-PLATINUM-Warranty-220-P2-0850-X1/dp/B010HWDOH6/ref=sr_1_2?ie=UTF8&qid=1475340874&sr=8-2&keywords=evga+supernova+p2

https://www.amazon.com/EVGA-SuperNOVA-PLATINUM-Warranty-220-P2-0750-X1/dp/B010HWDP48/ref=sr_1_3?ie=UTF8&qid=1475340886&sr=8-3&keywords=evga+supernova+p2&refinements=p_n_shipping_option-bin%3A3242350011

the 850w is cheaper then the 750W

turkey3_scratch · Oct 1, 2016

Wait why are you even concerned about inrush current? Firstly, I must dispel the notion that your computer hardware affects inrush current. What is connected to the PSU has no effect. Inrush current is solely related to the primary side of the power supply, not the secondary. Also, case fans use like 1W each so all those case fans in total use like 5W. In fact, your system there should have a gaming power consumption around 235W and max load should be around 275W; not high at all. So there's no reason to look into a power supply above 550W IMO. 450W is perfectly fine. Let me break down a gaming scenario for you:

GTX 1070: 150W
I7-6700: 70W
Other stuff: ~25W

So yeah you're looking at about 245W when gaming, I'll bump up my previous estimate a bit. So if you want your PSU to be cool, get one that will be more efficient for your type of load, which would be a ~500W power supply so 450W or 550W will work.

What PSU should I buy?

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