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HD 5850 crossfire on 650wats - Page 3

post #21 of 43
Quote:
Originally Posted by Willhemmens View Post
I admit I did my maths wrong.

I did 400+150=650 somehow. I ran a 5850 on a CX400, just and a 5850 pulls 150W so that's were I got my figure. With an extra 100W, you should be fine.
age_ruler1:

This post does a great job at explaining what I mean. AMD recommends a 500W power supply to power a system with one 5850 in it, but yet the CX400 handled his system fine. This is because it's a continuous-rated PSU. If I were to give it a peak rating, then I would probably call it a 550W PSU (again, if I were rating it by its peak power).

So that's why I say things like, "AMD/NVIDIA recommends a 500W power supply to power it, so that means a quality 400-450W is enough".
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post #22 of 43
Thread Starter 
@WillHemens.

Yup, I agree. I think and extra 5850 will draw another 100Wats or so. I guess I'm good Atm. I'm glad i didn't went cheap on my PSU. Back when I bought my PSU I was about to buy a random brand PSU with, as Two Cables said, 650 Peak-Rate PSU for like $60. But I decided I could spend more and get a good brand PSU. Phew!
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post #23 of 43
I had a no name 450W PSU once.

Put an AMD quad core and and 9600GT in it, after a few days it gave out, opened up the PSU, and the PCB was melted.

Lesson learned.
    
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post #24 of 43
Thread Starter 
@ Two Cables:

I see... I didn't knew that. And I find that very handy 'cuz I have built some rigs for friends and I always use good quaility PSU with 650-750Watts guessing that AMD and NVIDIA meant Quality 500-600 Watts PSUs for Mid-Range cards.

Thanks! Very handy info.
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post #25 of 43
Quote:
Originally Posted by age_ruler1 View Post
I did not knew that. Good to know. I just went and check my PSU box and it says 80% Bronze certificate. What does that means? Is that what you are talking about? that it can deliver 80% all the time?
The efficiency works like this:

If you were to measure the power draw at the wall outlet and ended up with a 600W reading, then we can say something like this:

If your PSU were 85% efficient during that power draw, then that would mean that the system was pulling 510W from the power supply when you saw 600W being pulled from the wall outlet.

So, if we had a system pulling 510W from a 100% efficient PSU, then we'd get a 510W reading at the wall outlet.

That's really all efficiency means.

Regarding that Bronze certification: meh, I think that it's over hyped for the sake of sales and marketing. For example: the 1100W ABS Majesty has the 80 Plus Gold certification, but I saw a professional review that basically said the PSU is a piece of junk.


Quote:
Originally Posted by age_ruler1 View Post
Yea... he had a Brand-less PSU.
Yeah, that's how important the PSU is.
Edited by TwoCables - 6/4/11 at 4:32pm
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post #26 of 43
Quote:
Originally Posted by age_ruler1 View Post
@WillHemens.

Yup, I agree. I think and extra 5850 will draw another 100Wats or so. I guess I'm good Atm. I'm glad i didn't went cheap on my PSU. Back when I bought my PSU I was about to buy a random brand PSU with, as Two Cables said, 650 Peak-Rate PSU for like $60. But I decided I could spend more and get a good brand PSU. Phew!
I'm sorry to repeat this, but I'm worried that you missed it:

Quote:
Originally Posted by age_ruler1 View Post
Hello OCN.

I just bought a second HD 5850 to crossfire with my current one. But I want to be sure if an Antec true Power 650wats can run them? I have 4HDDs 5 fans (One led) DVD burner and Some Leds. Everything else its on the sig rig.

Will my PSU be able to handle it ok?

Thanks
It will be very easy. The 650W TruePower New is a great unit.

AMD recommends a 600W peak-rated power supply to power a system that has two 5850s in it (proof). The 650W TruePower New is a continuous-rated unit which means it has a significantly larger capacity than any 600W peak-rated unit.

So yeah, you have tons of headroom.
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post #27 of 43
Thread Starter 
Quote:
Originally Posted by SmokinWaffle View Post
I had a no name 450W PSU once.

Put an AMD quad core and and 9600GT in it, after a few days it gave out, opened up the PSU, and the PCB was melted.

Lesson learned.
Lol... You learned the hard way. JK

I think I used my brand less PSU for about 3 months with a 9600gt and Phenom x4 (Not Phenom II)
Then I bought this PSU. With my first HD 5850.
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post #28 of 43
Thread Starter 
Okey... I kinda get it lol. I think this is the very first time I talk about PSUs at all lol. Very confusing at start. Just like any other PC component. But I think I understand now.
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post #29 of 43
I remember i tried to run my old HD5850 off of the stock PSU that came with my case, this was back before i knew anything about PSU's, it was a 500w raidmax and newegg said i need a 500w PSU so i figured i was k. Got the card and i mustve spent 5 hours trying to fanangle a way for the PSU to turn on with the card installed, i think the PSU had 21A on the 12v rail . So after taht ordeal i followed alot of phaedrus' posts and guides and am now very smart with the PSU's and the units of power supplying alike.
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post #30 of 43
Quote:
Originally Posted by age_ruler1 View Post
Okey... I kinda get it lol. I think this is the very first time I talk about PSUs at all lol. Very confusing at start. Just like any other PC component. But I think I understand now.
If you ever feel like you want to learn more, then definitely read any of these articles (actually, all of them - eventually):

http://www.overclock.net/power-suppl...-articles.html
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