PSU Wattage Confusing

[Stefan Payne]

3 hours ago, SpinSol said:

Guys thanks for your replies Im thinking of getting the Corsair rm 650 is it good for my build ?

 

Get the 550W instead or the Bitfenix Whisper M.

[SpinSol]

On 5/7/2018 at 12:25 AM, breixobaloca said:

RM650 or RM650x?

 

Rm650x

I believe it's better

[SpinSol]

On 5/7/2018 at 3:59 AM, Stefan Payne said:

Get the 550W instead or the Bitfenix Whisper M.

Im planning on upgrading the gpu

[seon123]

Just now, SpinSol said:

Im planning on upgrading the gpu

To what, a 1080 Ti? 450W is fine for that. 

[Stefan Payne]

2 minutes ago, SpinSol said:

Im planning on upgrading the gpu

Yes, and?
I'm using a 550W PSU with TWO Tahitis in the GHz Version -> 7970GHz/280X.

And I am still under 550W!

 

So what are you planning that you need more than 550W??

[SpinSol]

Then why all calculations websites give me suggestions always 600W or more

[seon123]

1 minute ago, SpinSol said:

Then why all calculations websites give me suggestions always 600W or more

Because they are useless, and overestimate by a ton. The brands have higher margins on the higher wattage models, and want to sell more of them. 

[SpinSol]

Alright thankyou everyone Ill go with the 550W

[breixobaloca]

Also, just check the internal differences between the RM550x and RM650x:

 

https://www.tomshardware.com/reviews/corsair-rm550x-power-supply,4484-3.html

https://www.tomshardware.com/reviews/corsair-rm650x-psu,4611-3.html

 

Not worth it in my opinion.

[Stefan Payne]

6 hours ago, SpinSol said:

Then why all calculations websites give me suggestions always 600W or more

Because they calculate with bullshit/worst case TDP Values.

 

Just try adding more DIMMs or remove them, adding HDDs and removing them. And look by mow much the calculated Value change.

 

And now think a bit about heatsinking, how huge the heatsinks for even 10W Power Consumption are.

 

A HDD can use up to 50W - for a couple of Milliseconds, the normal operation of IDE Drives is something like 700mA on +5V and +12V.

PSU Calculators regularly work with 50W for a HDD....

[SpinSol]

Thank you guys for your help I really apreciate it and learned a lot of things thanks

[Real Helper]

Best smps for your build. Corsair cs650m or corsair rm750i.

If you want to go cheap you can go with coolermaster masterwattelite 650 watt

Or corsair vs650

[Stefan Payne]

1 hour ago, Real Helper said:

Best smps for your build. Corsair cs650m or corsair rm750i.

If you want to go cheap you can go with coolermaster masterwattelite 650 watt

Or corsair vs650

?!

No...

 

The ones you recommended aren't that good, Corsair CS Series is EOL for a Decade, RM750i is just overkill, thus a waste of money.

 

And Master Watt Lite and VS650 are group regulated -> voltages can be forced out of Spec with load because +5V and +12V are dependent on each other.

That's why nobody here recommends those, especially in 650W, because you can get better quality PSU for the same amount of money. For example the be quiet Pure Power 10 Series (400W or up), Corsair CX Series (450W doesn't have two PCIe)

[SpinSol]

Cx series are better than Rmx ? 

[LienusLateTips]

11 minutes ago, SpinSol said:

Cx series are better than Rmx ? 

No.

[Stefan Payne]

2 hours ago, SpinSol said:

Cx series are better than Rmx ? 

CX550 is like 65€

RM550x is like 90€

 

Wich one would probably be better I wonder.