How Much Power Do I Need for My System?

[FrPSh]

Check out my lineup of parts for a new build, and tell me what size power supply I should get.

I will have

Gigabyte 890FX AMD motherboard
Phenom II X4 965 125W processor
2x2GB A-Data RAM @ 1600
HD 5770 (eventually in crossfire)
Single HDD and CD/DVD Drive

I am looking at a 750W supply for this, does that sound about right? I need enough power to do crossfire of the 5770's, from a good solid PSU manufacturer.
Recommendations?
I've been looking at this one because of it's 80+, great power, price, and reviews: http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006

Whaddaya think??

 

[lcp1109]

hello, here u can find the awnser: http://extreme.outervision.com/index.jsp

at most you will need a good 750w to CF and overclock the CPU, but just use the calculator to be sure

 

[WR2]

The Corsair 750 is a great deal @ $90.
You could easily get by with a Corsair 550VX for $20 less - but its just $20, right?

edit; the 750 has free shipping so the cost differential is even less.

 

[lcp1109]

http://www.tomshardware.co.uk/forum/282454-10-seeking-power-supply#t2114077

they told me that 550 is not the right choise to CF an HD 5770

 

[cowgod2007]

Great PSU at a great price (the corsair 750w). I basically have your system, except for a amd phenom II x3. I also have a 750w PSU, although not corsair, and everything runs perfectly.

 

[FrPSh]

Calculator gave me 407W - ??? Seems kind of low.
If I find a cheaper 600W, would that be enough?

 

[WR2]

I saw at least one person suggesting a Corsair 550VX. But with the price difference down to about $15 its hardly worth a quibble.

For this top-end system

 

[WR2]

The power calculator gave you something within a nudge or two of that chart.
Do you want to try and find something a bit less expensive?
Split the difference and go with the Corsair 650TX? lol

 

[lcp1109]

you will not OC your Phenom 965?

for how long are you planing to keep that PSU?

 

[WR2]

And free shipping.

 

[WR2]

When you figure in the rebates, discount and shipping.....the 650TX is actually cheaper than the 550VX.
That doesn't happen every day. And it won't happen after 5/31.

 

[lcp1109]

yep, go for corsair 650w, the configuration I want to make is a bit different

 

[FrPSh]

Thanks for the quick replies guys.
Would the 650W leave room for overclocking, crossfire, and possible multiple HDD's?
If so, I think I will save myself some money and go with the 650W one. Sounds like a very very nice PSU.

 

[WR2]

Would leave plenty of room for CPU AND GPU overclocking and beau coup HDDs, a few extra fans plus some nice case lighting.

 

[FrPSh]

Best answer selected by FrPSh.

 

[neiroatopelcc]

Calculator gave me 407W - ??? Seems kind of low.
If I find a cheaper 600W, would that be enough?

I found that an i5-750 with an 5850 only used 400W even when lightly overclocked (3.3) so I would be prepared to expect a 600W to be plenty.

I ran 3x4870 in my i7 (3.8) system with a draw of just over 740W from the socket - and an 4870 is more power hungry than your system, and so's my cpu.

 

[FrPSh]

zipzoomflyhigh,
I did read your post, and I really appreciate your answer. But I was getting the opinion of others as well. I want to make sure I have more headroom for future expansion, so I thought a 650 would be a bit safer. The quality of Corsair products will probably make the PSU last for a while, too.