• Help with a build
    44 replies, posted
Talk about overkill on the PSU. Get a 500W-600W. Unless you're Crossfiring 5970s, you won't need 1000W.
[QUOTE=GamerKiwi;22684957]Talk about overkill on the PSU. Get a 500W-600W. Unless you're Crossfiring 5970s, you won't need 1000W.[/QUOTE] In case he wants to throw another 5870 in there... or water cooling later on.
[QUOTE=NecroTitan;22685045]In case he wants to throw another 5870 in there... or water cooling later on.[/QUOTE] Sounds neat.
[QUOTE=NecroTitan;22685045]In case he wants to throw another 5870 in there... or water cooling later on.[/QUOTE] not even two 5870s will use 1000w He only need 750w if he wants to CF in the future
No they wont use 1000w, but the amperage on most 750w PSU's is lacking for CF 5870s.
Just an FYI: Two HD 5870's and a i7 930 OC'ed to 4GHz + consume just under 700w of power. if you wanted to max out 1000w PSU, and im not making this up, you would need a Phenom 2 X4 and FOUR GTX 295's
[QUOTE=Milky;22691921]Just an FYI: Two HD 5870's and a i7 930 OC'ed to 4GHz + consume just under 700w of power. if you wanted to max out 1000w PSU, and im not making this up, you would need a Phenom 2 X4 and FOUR GTX 295's[/QUOTE] I saw a video on Youtube not to long ago, and the guy had four GTX 480s in quad SLI. He was getting a max draw of 970 something watts while in-game. [editline]12:22AM[/editline] Oh, and a OC'd i7 980x [editline]12:22AM[/editline] I think the GPUs were OC'd too. [editline]12:22AM[/editline] I'll just try to find the video. [editline]12:32AM[/editline] My bad. I got that wrong. The video I watched must've been GTX 460s. [media]http://www.youtube.com/watch?v=vY8uppkjwL0[/media] The Quad SLI GTX 480s draw close to 1500 Watts.
[QUOTE=ghostofme;22693706]I saw a video on Youtube not to long ago, and the guy had four GTX 480s in quad SLI. He was getting a max draw of 970 something watts while in-game. [editline]12:22AM[/editline] Oh, and a OC'd i7 980x [editline]12:22AM[/editline] I think the GPUs were OC'd too. [editline]12:22AM[/editline] I'll just try to find the video. [editline]12:32AM[/editline] My bad. I got that wrong. The video I watched must've been GTX 460s. [media]http://www.youtube.com/watch?v=vY8uppkjwL0[/media] The Quad SLI GTX 480s draw close to 1500 Watts.[/QUOTE] Yet will still run on a 1200w PSU... interesting.
I got that info out of the latest issue of Custom PC where they had a PSU labs test and showed the different configurations for maxing out PSU's
[QUOTE=Milky;22701147]I got that info out of the latest issue of Custom PC where they had a PSU labs test and showed the different configurations for maxing out PSU's[/QUOTE] What alot of people don't know is that PSU's are rated for DC draw, and you cant test that without really expensive equipment, so when people say oh my god its pulling 1000w at the wall it doesn't mean that its outputting/being loaded at anywhere near that much. Watch linus-tech tips on quad sli GTX 480s. It runs on a 1200w PSU, and never draws more than 1100 at the wall. (Less than 900w of DC pull) Also anyone who says it takes 1500w is ill informed, as at max(In the US anyway correct me if this isn't true for you euro-fold) you can't pull over 1200ac watts from a wall socket, without a special breaker/socket.
[QUOTE=NecroTitan;22702835]What alot of people don't know is that PSU's are rated for DC draw, and you cant test that without really expensive equipment, so when people say oh my god its pulling 1000w at the wall it doesn't mean that its outputting/being loaded at anywhere near that much. Watch linus-tech tips on quad sli GTX 480s. It runs on a 1200w PSU, and never draws more than 1100 at the wall. (Less than 900w of DC pull)[/Quote] That's just energy lost in conversion. To get a close estimate of the wattage the system is using, multiply the % efficiency of the psu by the power draw at the wall. 1100 watts x .8 (typical efficiency of a good psu is 80-85) = 880 watts. :eng101: [editline]09:22AM[/editline] [QUOTE=NecroTitan;22702835]Also anyone who says it takes 1500w is ill informed, as at max(In the US anyway correct me if this isn't true for you euro-fold) you can pull 1200ac watts from a wall socket, without a special breaker/socket.[/QUOTE] Most breakers are 15 or 20 amps for normal household circuits; 15A will give you 1800watts, 20A will give you 2400watts. As far as I know, a normal outlet can handle the current. :science: [editline]09:32AM[/editline] Oh and just checked, the maximum draw for prolonged use (3 hours) is 20% lower than the breakers throughput. So 15A turns into 12, meaning 1440 watts. 20A turns into 16, 1920 watts.
[QUOTE=drummerundrcovr;22703500]That's just energy lost in conversion. To get a close estimate of the wattage the system is using, multiply the % efficiency of the psu by the power draw at the wall. 1100 watts x .8 (typical efficiency of a good psu is 80-85) = 880 watts. :eng101: [editline]09:22AM[/editline] Most breakers are 15 or 20 amps for normal household circuits; 15A will give you 1800watts, 20A will give you 2400watts. As far as I know, a normal outlet can handle the current. :science: [editline]09:32AM[/editline] Oh and just checked, the maximum draw for prolonged use (3 hours) is 20% lower than the breakers throughput. So 15A turns into 12, meaning 1440 watts. 20A turns into 16, 1920 watts.[/QUOTE] Standard is 15a, and at 1440 max reduced by say 20% because of the PSU's efficiency, that comes out to 1152, shockingly close to my original statement of 1200. In fact an 85% efficiency PSU comes out to Just over 1200, and its not just 3+Hrs that will reduce its efficiency, its also high load. Plus the fact that if you have anything else running on that circuit it will detract from the available wattage, or trip the breaker.
Dunno what calculation you're doing but 15A x 120V current = 1800 watts. Max continuous load is therefore 1440 watts on a 15A circuit. Also, I was talking about the household circuit when I said more than 3 hours continuous load... and good power supplies that can supply that high of wattage usually still retain good efficiency.
[QUOTE=drummerundrcovr;22705816]Dunno what calculation you're doing but 15A x 120V current = 1800 watts. Max continuous load is therefore 1440 watts on a 15A circuit. Also, I was talking about the household circuit when I said more than 3 hours continuous load... and good power supplies that can supply that high of wattage usually still retain good efficiency.[/QUOTE] 90% efficiency is highest and efficiency is best at 50-70% PSU load so at close to 100% load the best efficiency you can expect is around 80%, also 1800w is max theoretical burst power available.
[QUOTE=NecroTitan;22706012]90% efficiency is highest and efficiency is best at 50-70% PSU load so at close to 100% load the best efficiency you can expect [B]is around 80%[/B], also 1800w is max theoretical burst power available.[/QUOTE] :wtc: 80% is very good efficiency, the kinda of efficiency these high end psu's can supply. You're just restating what I said. And where are you getting your information from?!? It's not theoretical, If you have 14 gauge wire on a 15A circuit, you WILL be able to get near 1800 watts for a few hours before it trips. Go to or over 15A and it will trip fast.
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