Power Supply Wattage Calculator

Quick question, I'm upgrading to a system based on an overclocked 3570K ivy and an overclocked 7950, my current PSU is a 650w OCZ bronze-rated unit I bought when I built my current 6850/Phenom II X4 955 rig, do I need to bother upgrading the PSU for my new build, or will the current one suffice until I decide to add a second card?

It ill be enough for one. You could possibly manage with 2, but I really wouldn't trust an OCZ power supply on that.

Get a good brand like Corsair, Seasonic or Silverstone
 
It ill be enough for one. You could possibly manage with 2, but I really wouldn't trust an OCZ power supply on that.

Get a good brand like Corsair, Seasonic or Silverstone

Why does people complain so much on OCZ PSU?
OCZ has less RMA's than 2 of the other Brands u named...

///€dit: I'm sorry, mixed it up with Cougar <_<
 
Last edited:
Yeah i cant understand that. I am using a OCZ ZT 750W for all kinds of purposes since 3 month now and it works perfectly fine.
 
Why does people complain so much on OCZ PSU?

OCZ has less RMA's than 2 of the other Brands u named...

Are you talking about what Linus said on his Live stream?

If you are that's just one Computer store. So it doesn't necessarily give you a full picture.
 
Are you talking about what Linus said on his Live stream?

If you are that's just one Computer store. So it doesn't necessarily give you a full picture.

Ummm...
No?

I'm talking because OCZ power supplies are generally very unreliable. Please show me where you got the info on them having less RMAs than silverstone, corsair or seasonic?

A fair few on these forums have had OCZ psus fail on them, because they use cheap components in their products - hence why their SSDs have the highest return rates out of any other SSD manufacturer.
 
Just to clarify, Cos I think you got the wrong end of the stick.
I think the figure about OCZ having better RMA's rates is quoted from Linus.
I was just saying that I don't think that's a full statistical sample of worldwide OCZ RMA's.
 
Just to clarify, Cos I think you got the wrong end of the stick.
I think the figure about OCZ having better RMA's rates is quoted from Linus.
I was just saying that I don't think that's a full statistical sample of worldwide OCZ RMA's.

I have no idea what the comment even meant about Linus...
I don't watch him.

I'm talking from what I've read around the internet, especially on these forums, OCZ are a terrible company.
 
Generally speaking, OCZ PSUs are not to be trusted. Many of the users of this forum have OCZ products with no real qualms, but even more have had products break on them in undue time. I would never use an OCZ PSU in my own rig.

As an example, OCZ were sponsors of one of Tom's competition builds a few years back. Ever notice that Tom never reviews OCZ PSUs anymore? It's because the one they sent him caught on fire.

Stay awaaaaaaay.
 
Its not just about watts, always pay close attention to the 12v rail amp output. Without it meeting the minimum requirement of your gpu/s they will either have a shorter lifespan or behave erratically especially under heavy workloads.
Always good to have headroom with a psu. Their continuous power output degrades over time and once you go over the unit's level of efficiency power wasting increases.
Plus the noise from the fan trying to keep it cool.
There is no way id put my high end components in the hands of a cheap psu. Typo many systems get toasted by overworked psu's or poor caps etc.
 
Last edited:
I really don't think that site is very good, according to it, I could run a 3570k oc'd th 4.5ghz and 2 HD 5850's and that would only use 440w
Old post, but...

That seems to be fairly accurate actually. A 5850 has a rated TDP of 151w, the 3570k has a TDP of 77w, which would probably be around 100w depending on how many volts are added for the overclock. Since you didn't specific about the hard drives and motherboard, so I would assume the rest of the components would be pulling around 50w, which totals to 450w.

Should you be running a rig like that on a 450w power supply? Of course not, something along the lines of a 600-700w units would be suitable to ensure that unit is at lower load levels for cleaner power output and a longer lifespan overall.

Why does people complain so much on OCZ PSU?
OCZ has less RMA's than 2 of the other Brands u named...
It's worth noting that OCZ doesn't actually make the power supplies, but they sell rebranded units, typically produced by Highpower or FSP. Consequently you really can't generalize all of their products as they are being produced by completely different companies, let along the different price ranges different products are targeted at.

Their ZT and ZX series are pretty decent though, high quality internal components and clean power output.
 
Back
Top