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Is my PSU good enough?

post #1 of 17
Thread Starter 
I was looking to upgrade to the AMD 7870 gpu, and at the moment i have a Xigmatek 400w psu. Would it be good enough to handle the new card?
post #2 of 17
What kind of CPU do you have?

EDIT: Also, what PSU exactly and how old is it?
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post #3 of 17
Thread Starter 
I have the AMD Fx 4100 cpu and the psu is a xigmatek nrp-vc403 not sure when it was released but i havent had it long since May 2012
post #4 of 17
Haven't heard much about that PSU and it doesn't appear to be 80+ certified. I would think it could handle it, as long as you're not overclocking anything, but I'm not 100% sure it could. I'd say get either a better 400w or get a 500+ watt PSU just to be safe.
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post #5 of 17
Thread Starter 
Whats the worst that can happen if the psu cant handle it? Will it damage anything?
post #6 of 17
Typically it won't cause any damage. Most PSUs will simply lock up the computer and shut down. There is always the chance that it will destroy a component, but chances are the PSU will simply shut itself down before anything like that would happen, it's what they are designed to do.
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post #7 of 17
Thread Starter 
OK thanks, have you got any recommendations for a suitable psu?
post #8 of 17
Depends on how much you want to spend. Rosewill and NZXT are a few I prefer, but a lot of people recommend Corsair. If you're looking for something cheaper, Antec and OCZ make pretty cheap, solid PSUs.

Here's a 550w Rosewill Hive for $50 after MIR.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817182131
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post #9 of 17

Your current PSU has enough power, but I recommend keeping everything at stock because the quality of this PSU is questionable.

 

http://www.guru3d.com/articles_pages/amd_radeon_hd_7850_and_7870_review,7.html

 

With one 7870 under full load in their system, their PSU pulled 274W from the wall outlet.  Their CPU was idling, so I have to add 95W for an FX-4100 under full load (this would be the absolute maximum).  So, if the FX-4100 and the 7870 are both under full load at the same time, then the PSU would be pulling 369W from the wall outlet.  Now, the test PSU in the review linked above has about 85% efficiency, so if the PSU is 85% efficient while pulling 369W from the wall outlet, then the system is only pulling about 315W at the most from the PSU.

 

Still, I do not know how good your current PSU is, so don't overclock.  To be honest, it doesn't look like a quality-made unit to me.

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It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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post #10 of 17
Thread Starter 
Does anybody know the length of the XFX 7870 DD edition gpu?

EDIT: Its ok ive just found out that its roughly 254mm

Thanks everyone for the info
Edited by williamsd - 1/22/13 at 11:46am
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