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Important have to read this psu warning

post #1 of 9
Thread Starter 
Hello guru3d said that it is recommended 700 watt for gtx 590 but I had problems with my pc shutting off and on and I had 750 cheiftec psu so I upgraded to 850 and works great now
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post #2 of 9
FYI a good 650W unit can run any video card on the market, including the GTX 590. Guru3D is a good site but their PSU recommendations are always over the top. I just hope the 850W you got is good quality.
post #3 of 9
It has to do with the quality of the PSU.... not the advertised wattage.


A 600w could handle your rig.
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post #4 of 9
Thread Starter 
Yeah there is a difference between thermal and corsair 600watt than 850 cheitec that's for sure
Dovahkiin
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post #5 of 9
I have a cheiftec 650w PSU which can barely holds 300w requirement.
Best bet its the PSU being degraded to a point it can't support the 590.
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post #6 of 9
Quote:
Originally Posted by DuckieHo View Post
It has to do with the quality of the PSU.... not the advertised wattage.


A 600w could handle your rig.
And then some
    
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post #7 of 9
Agreed on wattage being pushed. Quality over quantity every time, although getting a high output, quality PSU is even better.

I bought a Corsair TX650V2 for my "spare" box, which pulls a little over 300 watts (according to a Kill-A-Watt) under typical encoding or gaming use. Assuming 80% efficiency, I'm not even hitting a 50% load on things.

My big rig has the HX1000, and has been known to pull 650 watts from the wall, and again, minimum of 80% efficiency would show 520 watts of power (this is my sig rig). However, I am a very, very firm believer in having far more power supply than required.

I've dealt with half a dozen Corsair units so far, and all of them have been very fine. I used to solely rely on PC Power and Cooling, but after the 750 Quad series, avoided due to more quality issues (their industrial side is still good). Seasonic is nice, too. I would also really suggest hitting up other reviewers to see better reviews. There is one site that even takes the power supply apart and shows the individual components, and where breakdowns may occur.

Typically a power supply included with a case is going to be rubbish, although some top tier makers are starting to do that, and I think that's a good idea.

I think many people also forget the multiple 12V rails many power supplies use. Some of those use virtual rails, too, but it can still cause issues. I prefer 1 (2 at most in the case of the HX1000) 12V rail. They may not reach the absolute efficiency of multi-rail designs (yet), but are far easier to balance loads on, and I believe it also shows better design, as engineering a heavier duty circuit is always more difficult, and requires more expensive parts instead of building multiple small-power circuits with cheap parts. I'm waiting to see more redundant power supplies come to market for the everyday power user.
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post #8 of 9
Quote:
Originally Posted by UnexplodedCow View Post
I think many people also forget the multiple 12V rails many power supplies use. Some of those use virtual rails, too, but it can still cause issues. I prefer 1 (2 at most in the case of the HX1000) 12V rail. They may not reach the absolute efficiency of multi-rail designs (yet), but are far easier to balance loads on, and I believe it also shows better design, as engineering a heavier duty circuit is always more difficult, and requires more expensive parts instead of building multiple small-power circuits with cheap parts. I'm waiting to see more redundant power supplies come to market for the everyday power user.
Actually, all multi-rail PSU's (except the one you have, which is really 2 separate PSU's in one) use 'virtual' rails, if you want to call it that.

In fact, multi-rail and single-rail PSU's are identical internally with the sole exception of the presence of over-current protection circuits placed on various groups of cables coming out of the unit (these OCP circuits define the 'rails'). 'Rails' are just a safety feature, not an architectural difference in the basic PSU design.

Externally the only difference is that multi-rail units will generally use higher-gauge (thinner) wiring vs. a single-rail equivalent. This is because the OCP's protect against any more than the specified wattage being pulled through the set of wires that's governed by that OCP.

With a single-rail unit you could theoretically pull the PSU's entire capacity through one molex plug, so all the wires need to be of a gauge that could handle this possibility w/o catching fire.

And 'balancing loads' is not a problem on multi-rail PSU's these days (was different in the early days) unless you're doing strange stuff like running TEC units or have a bunch of molex-PCI-Ex adapters running your video cards. As long as you use all cables as they're originally intended, there's never an issue in terms of trying to pull too much juice out of any one set of wires and tripping the OCP.

Lastly, multi/single rail has no effect on efficiency.

Don't mean to sound like I'm blasting you man ... a lot of people have the exact same misunderstanding ... I did myself back in the day until someone set me straight
Edited by brettjv - 4/15/11 at 6:20pm
    
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post #9 of 9
Quote:
Originally Posted by DuckieHo View Post
It has to do with the quality of the PSU.... not the advertised wattage.


A 600w could handle your rig.
This, a poor 700W power supply may not even supply 500W of stable continuous power.
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