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PSU 12v amperage

post #1 of 30
Thread Starter 
I'm looking to buy a new PSU, and I was wondering how many amps i should have at least on the 12v rail/rails? I plan on having a 7200 rpm hd, an ssd, an i5, and for now a HD 4890 probably upgrade that soon. so how many amps should i have?
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post #2 of 30
Ehh hard to say exactly. 40A-50A maybe?

A quality 500W should do quite well. Just make sure you have the right amount of PCI-E connectors.
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post #3 of 30
Quality 450W would do.

+12V amperage just determines effective wattage. If a PSU's total +12V capacity is less than 80% of its total capacity then it's effectively lower wattage than what the label says.

Just ignore "+12V amps", we'll already have weeded out the crap.
post #4 of 30
Phaedrus2129, the guru here. Agree. i5 processors are from 70w to 100w at stock depended on the which one, dual or quad etc. 4890 max draw 190w. Based on what you have, a solid psu can do 33a/400w should be fine. However, if you OC cpu and GPU, then you need to add additional 5a or so to it. Anyway, forget about the +12 amperage liked Phaedrus2129 said, pick a solid 450w psu.
Edited by linskingdom - 12/30/10 at 1:01pm
post #5 of 30
Thread Starter 
My problem is that I have a 550W PSU and its not quite doing the job. I do have my PC overclocked and sometimes it just cuts off during stress testing. Right now its at 4.011 drawing 1.275v on the CPU. I have ordered a water cooling setup and have been told that with it and possibly upgraded GPU later that I probably would be better with a higher wattage cpu. but i've been told that amps matter.

I plan to push it as far as I can, but I don't want my CPU crapping out on me.
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post #6 of 30
Which Rosewill 550W do you have? Rosewill started out a terrible brand, but have improved greatly. They've had several 550W models that range from decent to terrible.
post #7 of 30
Thread Starter 
Quote:
Originally Posted by Phaedrus2129 View Post
Which Rosewill 550W do you have? Rosewill started out a terrible brand, but have improved greatly. They've had several 550W models that range from decent to terrible.
I have this one http://www.newegg.com/Product/Produc...82E16817182017

When i bought it it had good reviews and it still does. I didn't think it would be a bad one. Which it hasn't failed, it just shut down unexpectedly.
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post #8 of 30
Thread Starter 
I should also add that i'm wanting one under say 90 dollars. Modular if possible but not necessary
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post #9 of 30
Quote:
Originally Posted by Phaedrus2129 View Post
Just ignore "+12V amps", we'll already have weeded out the crap.
By this, do you mean that selecting a quality built unit with an appropriate rated wattage negates the need to make sure it is providing sufficient amperage on the 12V?
    
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post #10 of 30
Quote:
Originally Posted by dembo1305 View Post
I have this one http://www.newegg.com/Product/Produc...82E16817182017

When i bought it it had good reviews and it still does. I didn't think it would be a bad one. Which it hasn't failed, it just shut down unexpectedly.
Oh yeah, that is crappy. Try looking at a Antec Truepower New. They have some on sale with a 10% discount code I believe.
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