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Can the PSU handle it ?

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May 31, 2009 8:16:17 PM

Hey. :bounce: 

I want to buy a "Cooler master Cosmos" with PSU of 850W. The "RS-850-ESBA".

And the rest of my system will be.

GFX cards : 2x XFX Radeon HD 4890 1GB GDDR5 (crossfire)
RAM : OCZ Platinum XTC DDR3 1333MHz 6GB KIT (3x Platinum Z3 XTC 2GB, CL7-7-7-20, 1.65 Volts, 240pin)
Mainboard : Gigabyte GA-EX58-UD4, X58, Socket-1366
CPU : Intel Core™ i7 Quad Processor i7-920
HD's : WD VelociRaptor® 300GB SATA and 2x Western Digital Caviar® GreenPower™ 1TB

+ Fans and a dvd rom

I have read a lot of articles to see how much power all this uses on full load, and
i came to the conclusion that this power supply just barely would make it.
but i might be wrong, im not an expert in power consumption.

What do you guys think ?. Can the PSU handle this computer ?
And i that case is there more power to spare, in case i need more HD's and such?

Thanks in advance :) 

More about : psu handle

a b ) Power supply
May 31, 2009 8:38:08 PM

yes.
May 31, 2009 8:52:08 PM

Not a single doubt at all it seemed :p 

Mind if i ask ? :p . How much more Hd's can i put in over time ?.
What if i upgrade to 12Gb ram ?
Or will it never be a problem at all ?
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June 1, 2009 11:23:01 AM

CaptivA said:
Not a single doubt at all it seemed :p 

Mind if i ask ? :p . How much more Hd's can i put in over time ?.
What if i upgrade to 12Gb ram ?
Or will it never be a problem at all ?


With 5xHDD and 6xRAM plus overclocking accounted for both i7 920 and 2xHD4890, still yes.
Or with a 25W pump for watercooling if you decide to go that route for that matter.
June 1, 2009 11:29:47 AM

Haha k. Thanks guys.

I just got worried when i read a test post that showd that each radeon card pulled
275W on full load, and the i7 + motherboard and ram pulled 285W on full load.
It made me kinda worried.

:D 
June 1, 2009 11:45:49 AM

No graphics card is capable of pulling that much at stock freq.
A single HD4890 pulling that much would be in excess of 1.05Ghz(core) with increased vGPU.

285W for i7 @4.1Ghz + Mobo + RAM is plausible.
June 1, 2009 1:02:46 PM

i guess it doesn't matter if i change the 4890 cards to GTX275 either then ?

Thanks in advance.
a c 243 ) Power supply
June 1, 2009 3:02:50 PM

CaptivA said:
I need you too look at this.

http://techreport.com/articles.x/16681/11

This is just another power consumption test out there which shows that the cards draw
quite a bit of power. What am i missing here ?.

That those wattages are for the entire system, not just the card.
Also that they are AC wattages, once converted, DC power will be about 20% lower.
June 1, 2009 10:00:12 PM

Ahh Okey :D 

I learned something new. woohoo xD :bounce: 

Thanks for the help fellas.

I do have more questions if that is okey. :o 
It looks like i'm going to buy the GTX 295 instead. But later on i would
probably like to buy another GTX 295 and run Quad SLI.

Can the power take THAT ? xD
And does that mainboard support Quad SLI ?. I did not find out about that anywhere. Maybe some of you can.
June 1, 2009 10:08:44 PM

Why would you want QuadSLI? It's buggy and low scalability.
By the time you want more performance R800(2xRV870) or G300 would be out, stomping any previous-gen. in SLi/Crossfire in dust. History repeats itself many times.

2x HD4890 uses slightly more power than a single GTX295 so no problem there.
June 2, 2009 10:04:14 PM

Oki. Well thanks for your help fellas. :) 

It will be the GTX-295 for me, should be just fine =)
Costs about the same as two 4890.
June 2, 2009 10:12:44 PM

Quad SLI is inefficient overkill.

As Wuzy said, wait till the GT300 chips come out if you're after extreme performance.

The 295 slaughters almost any game as it is so you seriously don't need to worry about that.
June 2, 2009 10:52:47 PM

Yup. I know. only buying 1 GTX-295 :) 

And yes, sounds fair to wait for the 300 series. And i will actually. :) 
The reason i'm so damn into this "must have super GFX power" is mainly because i'm
going from making machinima in BF2 to other games like OF2 or Crysis. And i need
the juice. but 1 single GTX-295 will do... saves me some money at least :bounce: 

Anyways, thanks again for your help :) 
June 2, 2009 11:12:28 PM

With the mainstream being 1680x1050 and now 1920x1080 a single top-end GPU will be able to power all modern games (except the overkill CryTek engine) above 40FPS at minimum, even with 16xAF switched on. SLi or Crossfiring two top-end GPU is really meant for resolution 1920x1200 and above to take full advantage (at current generation of graphics). At 80FPS and above you won't notice the difference.

It's a sharp increasing curve if you graph resolution/$ when it comes to gaming.
!