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Myth: More wattage is better - Page 2

post #11 of 24
Quote:
Originally Posted by Phaedrus2129 View Post
400W is about the lowest wattage you can find quality power supplies, so I don't rag on people for getting a 400W if they only use 200W. But PSUs like these:

Can power a lot more than people give them credit for.
It's precisely because nobody buys <400W PSUs that Enermax, Seasonic, etc, don't scale down their best designs. At this rate it won't be long before you have to get a 1000W PSU for your HTPC because every other design is years outdated on account of all the noobs buying 2000W units.

THIS IS WHY WE CAN'T HAVE NICE THINGS!
Edited by RonindeBeatrice - 2/23/11 at 5:26pm
    
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post #12 of 24
But how much is considered "headroom" vs "overkill"? When even most SLI setups can run on 600W I would argue many current PSUs as overkill.
post #13 of 24
Yet another good and informative post by Phaedrus.

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post #14 of 24
Quote:
Originally Posted by RonindeBeatrice View Post
It's precisely because nobody buys >400W PSUs that Enermax, Seasonic, etc, don't scale down their best designs. At this rate it won't be long before you have to get a 1000W PSU for your HTPC because every other design is years outdated on account of all the noobs buying 2000W units.

THIS IS WHY WE CAN'T HAVE NICE THINGS!
But you can't scale down a good performing mid-power design and expect to make any money on it. There really isn't much difference between a 400W and 600W that are of the same quality and built on the same design. Even though the 400W provides 33% less power, there is no way they can charge 33% less without cutting corners somewhere. You still need cabling (although a little less with a 400W vs 600W), you still need a fan and housing, you still need a PCB and transient filter and going from 600W->400W really isn't going to affect the capacitance needed all that much. Sure you can use slightly less powerful transistors/rectifiers/MOSFETs in the 400W, but it won't be enough to make much difference in the final pirce. There is a reason why the HX450 and VX450 were discontinued. Sure they performed just a well as their higher wattage brethren, but no one would buy them since you can get a 550W for not much more.
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post #15 of 24
Quote:
Originally Posted by RonindeBeatrice View Post
It's precisely because nobody buys >400W PSUs that Enermax, Seasonic, etc, don't scale down their best designs. At this rate it won't be long before you have to get a 1000W PSU for your HTPC because every other design is years outdated on account of all the noobs buying 2000W units.

THIS IS WHY WE CAN'T HAVE NICE THINGS!
Don't forget that the little alligator mouth eats the bigger number in inequalities.

I personally think the market will stabilize around 750W supplies, somewhat like we have now (meaning you can still find things +- 450W). They're already more than most people will ever use (dual GPU is already pushing it for the common user, and anything above is quite a rarity), quite cheap and reasonably efficient. As time progresses electricity will not be getting any cheaper, it has nowhere to go but up, and people will start becoming disenfranchised with the idea of bigger and bigger energy beasts jacking up their bills.
That's why we see CPUs and GPUs becoming consistently more efficient rather than more power hungry with every new iteration (with some exception of course).

And while I agree with phaed's post, I don't see why, within reason, if you find a good deal you couldn't bump yourself up a bit more in power supply than is strictly needed.
Sure I could get a sweet seasonic x400 and power my current rig with beautiful deliciously clean power without skipping a step, but on the other hand I've seen sweet 650watt XFX's sale for less than half the price, which would still give quite admirable performance and if I decide to slot a second 6870 into my machine, or do just about whatever, not worry about full-load / overloading or adding the cost of a replacement PSU into my purchase thoughts.

Just run a real cost / benefit analysis for yourself, and keep in mind that as a number of people often mention, your needs are probably far less than what advertisers lead you to believe, to find the right slot for yourself.
Edited by ocpokey - 2/23/11 at 4:53pm
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post #16 of 24
Quote:
Originally Posted by ocpokey View Post
Don't forget that the little alligator mouth eats the bigger number in inequalities.
That's why that loop ran forever today

I really didn't consider the difficulties in scaling down the best designs
Edited by RonindeBeatrice - 2/23/11 at 5:33pm
    
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post #17 of 24
Quote:
Originally Posted by Bal3Wolf View Post
1 reason i see alot that people buy higher psus then they need is so they can upgrade later on it would suck to buy a 400 watt for a single card then decide your going to get another and then you would have to invest in another psu with the new video card.
But quality 400w psu are only $30-$40 which isn't a lot and most of the time people buy them is because of there budgets/needs
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post #18 of 24
Ive been using a super cheapo 500w psu and I cant say that I have had any problems.

I should be getting a 550w ocz today so I can crossfire some hawks. Even though ati recommends 600w, I think 550w should be fine, I do have a couple of case fans but their like 2watt each max. At the MO i dont think I am using above 400watts, the reason i am upgradding is because ive run out of connectors for my second hawk.
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post #19 of 24
Quote:
Originally Posted by Phaedrus2129 View Post
So they buy a higher wattage PSU and try to justify it to themselves. "I need it for that Sandy Bridge and Fermi upgrade I might do some day maybe if I get two promotions and taxes drop." "It's for headroom." "I heard PSUs are more efficient if you only run them at 50% load."
This right there is what annoys me the most.

Edit: Another pretty ridiculous rule I've heard around here is that you should never have your PSU above 80% of its rated output.
Edited by GameBoy - 2/24/11 at 12:27am
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post #20 of 24
I run my main desktop with a Q9550 and GTX260 on a 430W Seasonic S12II. I can be compiling and have a 3D game running in the background for hours and the I won't feel any heat on the PSU chassis or from the exhaust.

Apparently my graphics card recommends a minimum of 500W PSU and a 36A rating on 12V. PSU doesn't meet either of those specifications on top of needing to power a quad.

This might actually be a problem..
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