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PSU question with RAdeon 5770

Last response: in Components
February 15, 2010 4:53:07 AM

I recently ordered an XPS 8100 and upgraded to a HD 5770 from Dell. I hear the 5770 requires a 450wt PSU, and the studio XPS 8100 only comes with a 350wt. In result, they turn down the card so the psu supports it. Is this true at all?

I dont know anything about computers so how negatively would this affect my performance?
February 15, 2010 5:10:58 AM

February 15, 2010 5:15:20 AM

If you put a 5770 in that 350wt system, chances are it wont even start up, youll most likely need to get a new PSU.. something from a quality brand around 550 watts will do fine. What was the GPU that came with the system?
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a b ) Power supply
February 15, 2010 5:18:35 AM

^What are you saying?
Even a good quality 400W PSU will take the load of a HD5770.

Can you tell the amps on +12V Rail of your PSU...It should be written on a sticker on the power supply.
Dell PSU are pretty good.
February 15, 2010 5:28:37 AM

I havent recieved the PC yet. It had some options for gfx cards when i built it, and i picked the 5770. There was no info on what wattage the PSU was, but i heard to XPS8100 comes with a 350 watt PSU.

I dont think dell would sell PCs that wont work from the get go.
February 15, 2010 5:29:36 AM

Do you guys think maybe they will underclock the gpu so the 350 watt psu will take the load? And would that hit the performance badly?

Can you upgrade the PSU in Dells?
February 15, 2010 5:30:19 AM

My specs are I7, 6gb ram and Radeon 5770
a b ) Power supply
February 15, 2010 5:43:00 AM

Yes you can upgrade PSU in dells.
350W will suffice but you're cutting it too close.
But you'll be having warranty with that Dell...

So you're good to go.
February 15, 2010 5:45:23 AM

Like what kind of problems could this cause?

Can i just go to best buy and get a PSU? Will they all fit, or do i have to get certain ones?
February 15, 2010 6:22:00 AM

Also, will i be able to upgrade the gfx card in this machine? I heard dells are picky with what you can upgrade. Im not thinking about that now, but maybe in a year or two.

Thanks for all your help so far, too:) 
a c 248 ) Power supply
February 15, 2010 10:59:16 AM

Go to the Dell website. Contact Dell. Ask about the video card upgrade and the power supply.
a b ) Power supply
February 15, 2010 12:53:30 PM

Unless its a slim PC case...You should be able to change the PSU. But as Johnny said you should contact dell.
They will give you precise info...
a b ) Power supply
February 15, 2010 2:32:01 PM

Also keep in mind if you upgrade the PSU on your own it will void the warranty you have with DELL - I'm sure that DELL has tested the configuration as is to ensure they work together otherwise when selling the upgrade they would require the PSU to be upgraded as well so I wouldn't worry about it - My system has a 5770 and a Phenom II X3 720 with the 4th core unlocked and it never uses more than around 230W under load and only uses 95W when just using the internet etc. so a good quality 350W PSU should be plenty !!
a b ) Power supply
February 15, 2010 5:22:30 PM

^Yes. They have seal on the side panel,which if damaged,voids the warranty...
February 16, 2010 9:23:57 AM

Ok so it seems i should be good to go. And yeah i didnt think they would sell a PC that would break, cuz its hassle for them as for me.

Thanks everyone, you have all been very helpful :) 
a b ) Power supply
February 16, 2010 9:43:26 AM

One advantage of getting branded PCs : WARRANTY ;) 
February 16, 2010 11:21:33 AM

yes, haha. Im just hoping i dont have to use it, because it will be a hassle. Ive never really had Pc problems, and hope i never do:) 
February 22, 2010 10:57:12 PM

Well i got the PC, and it runs great. Im playing Crysis at max settings and it runs good, played some demos of CoJbib and UT3, everything runs great. I am pleased with it and thankful for all your helo:) 
a b ) Power supply
February 23, 2010 2:42:07 AM

Wow! :) 

Good to know all this.

Enjoy buddy!
March 9, 2010 9:29:09 PM

I just found this thread from a search, so I thought I would chime in. I recently purchased the 8100 with the 5770 in it as well. It works fine. No problems.

I wanted to upgrade the power supply and add case fans but didn't want to lose the warranty coverage.

Anyhow, my 5770 is working great with the 8100!
March 10, 2010 9:01:08 AM

yeah ive had no problems whatsoever so far.