Originally Posted by Stefy
Yes, I thought so. Also, in the reviews I linked the PSU is keeping 80% efficiency, even goes as high as 89% in one of them, so I don't see the problem. Silentpc seemed to be completely off with their numbers. And the fact that I ran 470's in 8 months s just proves that it ain't crap. But /care anyway, just because it's an unknown brand doesn't make it trash.
But just because a PSU has good efficiency, it doesn't automatically mean that it's a quality unit (unfortunately). I would like to elaborate on this and prove it, but instead I have to humbly refer you to Phaedrus2129. Not only will he be able to explain it, but he'll also be respectful (unlike some
people in this thread).
Originally Posted by IntelConvert
i was assuming if you have the money for SLI 580s, you will be running comparable hardware in the rest of the computer like a 1366/1155 rig or PHII X6. the HX750 is also capable, i like that PSU a lot
your original post was pretty offensive and i assumed you were trolling. plus you didnt even provide a link to the thread where people recommended a 1000w psu for SLI 560s, because i dont think anyone who knows what they are talking about would recommend that. SLI 560s arent hard to run, specially on a 700w unit. they are pretty efficient cards
How was Stefy's OP offensive? All he was doing was asking a question, and that question was this: "why are there so many people who make such bloated PSU recommendations?"
So, that's why I replied with this:
"Being that NVIDIA recommends a 500W to power a system with a single GTX 560 in it, I'm absolutely not surprised that a 700W can power a system with two 560s in it. Even a quality 600W would
[or should] be enough.
I think the reason why people recommend way more than is actually needed is just because they don't know enough, and plus it seems like too many people immediately think that the newest graphics cards will consume way more power than their older counterparts."
Believe me, if his post were offensive, then I would have reported it and I also would not have responded. I mean, all he's doing is trying to figure out why we have people who confidently make overly-bloated PSU recommendations. Of course, he's also being helpful by adding a thread to OCN that proves that our systems don't consume as much power as some people think. I can almost guarantee you that this thread will help at least
one person save money.
Originally Posted by IntelConvert
maybe the horrible units they stock in stores you need a giant PSU to power a normal computer lol. people in stores suck. lol. my friend just went to a best buy and the guy at the geek squad desk was looking up how to install a DVD drive.
manufactures go with worst case scenarios so people who buy rosewill or raidmax wont grenade their computers immediately.
Actually, their PSU recommendations are covering PSUs with a "peak" rating (which, of course, does include the lower quality PSUs). But there's a little bit more to it than that. Take the GTX 560 for example: NVIDIA says that they recommend using a 500W power supply to power a system with a single GTX 560 in it. So even if you're using a 500W that has a "peak" rating of 500W, it should be enough. But they're also referring to powering the typical type of system that would have a single GTX 560 in it. In other words, they're referring to a totally modern system.
So, this is why we can say that even a quality 450W would be absolutely enough to power a system with a single 560 in it because a recommendable 450W should have a "continuous" 450W rating with its "peak" rating exceeding 500W (usually).
But things get a bit hairy when such a system is overclocked because this raises the importance of getting a quality PSU that has important things under control such as the ripple which helps keep the system stable while overclocked. So this is where it becomes a bad idea to get like a generic 900W PSU to power a system with like two GTX 560s in it because it's quite likely that such a PSU woudn't be able to handle it and it might fail under the stress of trying to keep an overclocked system stable - especially when playing something like Metro 2033, or when doing all of the necessary stress testing.