i5 on Asus P7P55D with Radeon HD 5770, PSU???????

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Gregory

5 posts

Wannabe Geek

# 45684 3-Nov-2009 20:09

Hey I'm in the process of odering some new parts.
I was just looking for a bit of advice .
My basic set-up will be:

ASUS P7P55D Intel P55 Core i7/i5 PCI-E DDR3
Intel Core i5 750 Lynnfield 2.66GHz 8MB

SuperTalent Gold Series 2x2GB DDR3-1600 CL9
Sapphire ATI Radeon HD5770 1GB GDDR5 PCI-E

with a 1tb SATAII HDD
dvd writer

and that's about it

I was wondering wheter I could get away with using a 420W Power Supply.
Would this be fine, or should I buy a new one?

If so, what sort of supply would you recommend???

Thanks, Greg

Wilstar

71 posts

Master Geek

# 269836 4-Nov-2009 00:50

That's gonna be a bit tight, it's better to have a slightly higher rated supply than you need in my opinion. This way it's not going full steam all the time which can cause temperature and voltage stability issues. I'd go a 550-600w psu. I'm an enermax fanboy, but anything with a warranty does the job. Heard good things about Antec earthwatts

Gregory

5 posts

Wannabe Geek

# 269842 4-Nov-2009 01:46

Thanks for the answer.

To make things a little better I have found a deal I am happy with for a 500W PSU.
Is this compromise enough in your opinion?

Ragnor

8035 posts

Uber Geek

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# 269843 4-Nov-2009 01:51

With power supplies you're better safe than sorry in my opinion, I would go for > 500w . Corsair come highly recommended for reliability and quietness, they do a 550w with standard cabling and a 520w with modular cabling for around $170ish if I remember rightly.

Gregory

5 posts

Wannabe Geek

# 269846 4-Nov-2009 02:06

I used the Extreme outer vision PSU check for the system under full stress and received 314W as total consumption. http://extreme.outervision.com/PSUEngine

A few components in this set-up are 'green' so consume less power than conventional components.

With this said, is this a reliable answer @ 314W

If so I would still aim to 500W.

Please tell me if this is unreliable information.

Ragnor

8035 posts

Uber Geek

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# 269849 4-Nov-2009 03:01

That calculator is pretty good, the new tech i5 and 57xx are pretty energy efficient.

What make and model is the 420w you have at the moment? Can you read the sticker on the side of it with the rails (5v, 12v) and what they are rated for?

One thing you need to bear in mind many older and even newer generic PSU's state a maximum rated power level, but do not guarantee that they will supply that power level continuously.

Another thing is that some PSU manufacturers inflate their wattage number by rating it at at ambient temperature at 25C in a lab, PSU's typically operate at 40C in the real world and higher temps typically mean the output falls.

Gregory

5 posts

Wannabe Geek

# 270149 4-Nov-2009 20:40

Hey I'm not going to use the 420W as it is unsuitable (poor quality).

I can get a Cooler Master Extreme power plus 460W for a reasonable price.

I looked at the stats and am confident this will work fine.

If the rig is rated at 314W, a reliable 460W supply is almost 1.5x the required amount.

I heard that is a good figure to use for a safe supply.

Would you consider my problem to be solved?

Wilstar

71 posts

Master Geek

# 270274 5-Nov-2009 10:53

Sounds as though you've already made up your mind. We have both given sound advice, I stick by my previous recommendation.

vinnieg

2260 posts

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# 270282 5-Nov-2009 11:19

To be honest, I wouldn't trust that PSU.

The Cooler Master Extreme Power Plus 460w is only actually 401.5w max power and in most the reviews on the net, it fails to even try and deliver 460w of Power.

I'd go for say a Silverstone or Corsair 500w minimum PSU with an 80+ efficiency rating. So you'll overall save power on the 460w(really just a 400w) non 80+ efficiency PSU and have room to move to a higher CPU and more ram/more HDDs etc

I have moved across the ditch. Now residing in Melbourne as a VOIP/Video Technical Trainer/Engineer.

vinnieg

2260 posts

Uber Geek

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# 270287 5-Nov-2009 11:28

If by the good price, you mean $65 from Pricespy, I would seriously consider spending another $100 ontop of that. You want the PC to last, you don't want it ruining parts due to a bad PSU and you also don't want to be limited by the PSU. I would go the: Silverstone ST50F 500w 80+ efficiency $95 Silverstone Strider ST56F 560w 80+ efficiency $126 Corsair CMPSU-520HX 520w 80% efficiency $169 Thermaltake Litepower W0355 600W 65% efficiency $110

This is worrying, it's only rated at 70% max efficiency @ 401 watts max..and fails a lot of online stress tests at anything above 350w....also, this would cause you to use more power, if it was draining say 300 watts, it'd be pulling above 400ws with the 70% efficiency, probably higher though...so in the end you'd be using more power than a 500w 80% running @ 400w

I have moved across the ditch. Now residing in Melbourne as a VOIP/Video Technical Trainer/Engineer.

Ragnor

8035 posts

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# 270305 5-Nov-2009 12:12

Yeah that cooler master uses a two rail design ie: two 12v rails at 18A. Multiple rail designs were common in the past when the ATX standard restricted PSU's to 20A max on the 12v rail.

However those designs have been superseded by large single rail designs.

I would still recommend a Corsair VX550 or HX520 (HX if you want modular cables). Very quiet, great reliability and 4-5 year warranty.

Gregory

5 posts

Wannabe Geek

# 270335 5-Nov-2009 13:58

I'm sorry if it seems as though I ignored your advice.
I was just reading other forums online, that psu had good reviews. But I guess people always try to claim the components they own themselves are great ,and that can be a little misleading.
I will not be purchasing the cooler master.
Thanks for your help, I will look out for one of the suplies you have collectively recommended.

Thankyou all

Greg

vinnieg

2260 posts

Uber Geek

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# 270340 5-Nov-2009 14:06

No worries Greg :) looks like you are going to have an awesome machine and very power efficient too!

Keep us informed of how you go and post pics

I have moved across the ditch. Now residing in Melbourne as a VOIP/Video Technical Trainer/Engineer.

Ragnor

8035 posts

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# 270500 5-Nov-2009 21:46

The thing with the PSU is you could get away with it, it may work fine... but it's the worst part to skimp on because it affects everything.

Wilstar

71 posts

Master Geek

# 270510 5-Nov-2009 22:41

And might burn your house down!