PSU for new build

MaelstromMaster

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Mar 8, 2012
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Hi everybody-

So I'm building a new rig and was wondering if a 550W PSU is going to be enough for it/future-proof.

Here are the specs:

Intel i7-3770k CPU (I know it's not out yet; I'm waiting for it)
Mobo TBD (waiting for the Z77s)
DVD-RW
1x HDD
1x SSD
4 x 4 GB DIMM

That's it for now. I plan on adding a discrete GPU eventually, but for now, I don't really need it/can't afford it. That's why I'm waiting for IVB. When I do, it'll probably be something like a Radeon HD 6870. It's pretty unlikely that I'll be running a dual GPU setup.

The other consideration is overclocking. Is 550W going to give me enough room to overclock the crap out of the CPU/RAM? I may add a water-cooling option later on if I really get into video editing.

Thanks!
 

MaelstromMaster

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Mar 8, 2012
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So 550W would be enough for water cooling, over-clocking, and a discrete GPU? (Because I'm able to get a 550W supply at a big discount. Probably should've mentioned that.)
 

e56imfg

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Sep 5, 2011
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It should be a quality one with enough AMPS to power everything. If you're getting a $5 PSU with a funky looking brand name, it will blow up your PC guaranteed.
 

MaelstromMaster

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Mar 8, 2012
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Nah. It's an XFX. My friend builds systems and has an extra XFX 550W. I just came on here for a second opinion.
 
The 3770K is a 77w part.
Without a graphics card, you will only need a 150-300w psu for the whole pc.

Add 200-300 w per graphics card.

Your 550w psu should be sufficient to run your rig including a current graphics card as good as a GTX570. Newer 28nm 7970 and GTX680 will need only 500w.
XFX is an excellent brand. Go for it.


 


If you increase the core voltage of a 77w chip by 20%, you are adding only 15w.
Exceedingly high voltages are not good, better to be conservative and just raise the multiplier.
 
CPU power consumption is not linear.

e.g.: i7-2600K (Max TDP of 95 W) overclocking power draw from the +12 Volt rails @ 100% CPU load :

@ 5.0 GHz 219 Watts (18.25 Amps)
@ 4.8 GHz 180 Watts (15.0 Amps)
@ 4.7 GHz 162.4 Watts (13.5 Amps)
@ 4.4 GHz 111 Watts ( 9.25 Amps)
@ 3.4 GHZ 86 Watts ( 7.2 Amps) <--- Stock Clock Speed

In this example the power draw rapidly increases when the clock speed is above 4.6 GHz (i.e. more like an exponential increase).