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450W power supply good for this build????

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November 12, 2010 10:15:14 PM

450W

- Seagate barracuda 500GB 7200rpm SATA HDD

- Intel Core i5 650 3.2GHz socket 1156 w/ fan

- ASUS P7PP5D-E PRO Socket 1156 DDR3 (i7/i5/i3 support)

- 22X Dual Layer SATA DVD RW

- Kingston 2x 2GB RAM (1333MHz)

- ATI Radeon HD6850 PCI-E Graphics Card
a b B Homebuilt system
November 13, 2010 1:04:51 AM

I don't know about all that. If you're using a quality PSU, 450 should be sufficient. I'd go with something along the lines of 600 or so just to add in some expandability, but that's just me.

http://extreme.outervision.com/PSUEngine

Try that out. It's not perfect, but it can get you a decent ballpark. I used the 5870 as a reference, since they don't have the new 6xxx cards plugged in yet. I imagine they'll use less power too.
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Related resources
November 13, 2010 1:11:24 AM

jack_attack said:
I don't know about all that. If you're using a quality PSU, 450 should be sufficient. I'd go with something along the lines of 600 or so just to add in some expandability, but that's just me.

http://extreme.outervision.com/PSUEngine

Try that out. It's not perfect, but it can get you a decent ballpark. I used the 5870 as a reference, since they don't have the new 6xxx cards plugged in yet. I imagine they'll use less power too.




http://c1.neweggimages.com/BizIntell/tool/psucalc/index...

i used this as a reference
they don't have the 6xxx series cards up either >.<
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a b B Homebuilt system
November 13, 2010 1:25:57 AM

Silly PSU calculators anyways. ATI recommends a 500W PSU, but they usually go high. I think I remember nvidia spec'ing a 850W or something for my 295, but my Corsair 750 has no problem whatsoever.

With the price difference between 450 and 650 on decent PSU's being low, I'd still take the leap for more.
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a b B Homebuilt system
November 13, 2010 2:06:53 AM

Just use the 5850 in your estimates, and you'll be plenty safe. Here is a comparison from Tom's: Power Temperature And Noise Benchmarks.

Using this calculator: Antec Power Supply Claculator assuming no overclock, 4 led fans and 20% aging of capacitors, I come up with minimum 397 watts.

That is close - you had better have a Seasonic or equivilent. Check your PSU against JonnyGURU. If you do not see your specific brand/model, then check todays' article to see the make: Who's Who In Power Supplies
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November 13, 2010 2:18:49 AM

I think I am going to go with the 550 or 650W PSU. Thanks for all of the help fellas. Keep your opinions coming. I am a pretty amateur PC designer though I have been involved with PCs a lot in my life.
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a b B Homebuilt system
November 13, 2010 2:21:12 AM

eloric said:
Just use the 5850 in your estimates, and you'll be plenty safe. Here is a comparison from Tom's: Power Temperature And Noise Benchmarks.

Using this calculator: Antec Power Supply Claculator assuming no overclock, 4 led fans and 20% aging of capacitors, I come up with minimum 397 watts.

That is close - you had better have a Seasonic or equivilent. Check your PSU against JonnyGURU. If you do not see your specific brand/model, then check todays' article to see the make: Who's Who In Power Supplies



I've never seen those two resources, but they look very helpful!
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November 13, 2010 3:20:26 PM

This is an alright PSU calculator. It seems to not over exaggerate too much....

http://www.corsair.com/psufinder/default.aspx

It says 450 should be fine, you might want a bigger one if you want to upgrade, video or add more HDs.
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November 13, 2010 7:18:24 PM

I suppose PSU efficiency/ratings should be taken into account (no rating/80+/80+ Gold etc). Are PSU wattages the figure for continuous power (ie. they can supply a higher peak power than rated) or do they just give their peak value?
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November 13, 2010 7:24:28 PM

I can understand "ATI going a bit high" - just because the PSU box says 500W it's not what you'd really be getting, because no PSU is 100% efficient, some might be far from it.
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a b B Homebuilt system
November 13, 2010 7:30:06 PM

ATI doesn't make power supplies.

That's based of their recommendations, and you're right on with efficiencies. In reality, the majority of consumers are A-Ok with going to Best Buy and slapping the fattest Dynex PSU in there prebuilt to power that new GPU. But, we all know how that goes, so they peg the number high so the majority of PSU's will power the system. I imagine that's a corporate liability and PR issue, not so much on real actual numbers.
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