Aces High Bulletin Board
General Forums => Hardware and Software => Topic started by: potsNpans on December 19, 2013, 06:41:59 AM
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My Antec EA-750 PSU I currently have lists its power output on the 12V rails, with 4 +12v rails each with a max load of 25A. I'm considering a new GPU, which requires a 42amp 12v rail and would like to know if my current PSU would suffice? The card I'm looking to run is a EVGA GTX 780 3GBhttp://www.newegg.com/Product/Product.aspx?Item=N82E16814130917 (http://www.newegg.com/Product/Product.aspx?Item=N82E16814130917). Would my current PSU be up to the task?
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Potsnpans, if you look at the 5th picture in the link for that card, it shows the top view of the video card. On the left you can see two black connectors with a total of 14 pins. That is where you will plug in the supplementary power for the card. Newegg's write up for your PSU show it has a PCI-Express Connector with 2 x 6-Pin, 2 x 6+2-Pin connectors. You'll be fine.
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He is asking about the amperage...
If you combine two of the rails you should be fine yes. 25+25=50A
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He is asking about the amperage...
If you combine two of the rails you should be fine yes. 25+25=50A
I wouldn't be so sure of that.
Volts x Amps = Watts. If he has 4 x 12V rails @ 25A ea. then his PSU should be rated at 1200 Watts at 100% efficiency.
Similarily, if it's rated at 750 W with four +12 volt rails equally rated then @ 100% efficiency each rail can only carry 15 amps; not enough to run the card unless he's somehow able to connect all four rails.
We know that no power supply runs at 100% efficiency and we're also not deducting wattage for the +5V circuits.
This is simple PSU marketing trickery. They're probably rating the rails at max load which is not sustainable but may be available for micro seconds. Reputable PSU maufacturer's don't resort to this and it's a good idea to check this when buying a PSU.
I'd warn you to use at your own risk.
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Single rail design PSUs are easyer to evaluate :)
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I wouldn't be so sure of that.
Volts x Amps = Watts. If he has 4 x 12V rails @ 25A ea. then his PSU should be rated at 1200 Watts at 100% efficiency.
Similarily, if it's rated at 750 W with four +12 volt rails equally rated then @ 100% efficiency each rail can only carry 15 amps; not enough to run the card unless he's somehow able to connect all four rails.
We know that no power supply runs at 100% efficiency and we're also not deducting wattage for the +5V circuits.
This is simple PSU marketing trickery. They're probably rating the rails at max load which is not sustainable but may be available for micro seconds. Reputable PSU maufacturer's don't resort to this and it's a good idea to check this when buying a PSU.
I'd warn you to use at your own risk.
Most power draw is on the 12v rails anyways. He has an 850 watt PSU so at 50 amps on 12 volts thats 600 watts. Now what maters is the other stuff connected to the computer that draws on the 5v and 3.3v He has to look at and estimate how much he is drawing per rail before he can put two rails in parallel.
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Most power draw is on the 12v rails anyways. He has an 850 watt PSU so at 50 amps on 12 volts thats 600 watts. Now what maters is the other stuff connected to the computer that draws on the 5v and 3.3v He has to look at and estimate how much he is drawing per rail before he can put two rails in parallel.
He said it was 750 Watts. If it's 80% efficient that's 600 Watts total for a maximum of 50 amps across all the 12V rails (53 amps @ 85% and 56 amps @ 90%).
Frankly I don't care what he does but if you're going to make these recommendations I hope you're prepared to replace the parts that fry when they do.
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He said it was 750 Watts. If it's 80% efficient that's 600 Watts total for a maximum of 50 amps across all the 12V rails (53 amps @ 85% and 56 amps @ 90%).
Frankly I don't care what he does but if you're going to make these recommendations I hope you're prepared to replace the parts that fry when they do.
Correct. Correct on both accounts.
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He said it was 750 Watts. If it's 80% efficient that's 600 Watts total for a maximum of 50 amps across all the 12V rails (53 amps @ 85% and 56 amps @ 90%).
Frankly I don't care what he does but if you're going to make these recommendations I hope you're prepared to replace the parts that fry when they do.
First off. You have no idea what the rest of the power draw is on the system. 750 watts is good FOR ANY single graphic card system out there. Even some 2 way graphic cards.
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BaldEagle is quite right. You also have to consider Antec does "marketing" numbers on the rails of their power supplies. They do not provide a true rating based on actual usage.
I would avoid using Antec and get a better quality supply.
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Thank you for your helpful input. I will be doing some more reading on power supplies units, and EVGA cards power draw.
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BaldEagle is quite right. You also have to consider Antec does "marketing" numbers on the rails of their power supplies. They do not provide a true rating based on actual usage.
I would avoid using Antec and get a better quality supply.
The Antec model in question is most probably made by Delta Electronics, just for the record. Delta seems to have a reasonably reputable name, but you never know what Antec has told them to build.
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The Antec model in question is most probably made by Delta Electronics, just for the record. Delta seems to have a reasonably reputable name, but you never know what Antec has told them to build.
There is a reason Seasonic stopped building many of Antec supplies.
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Skuzzy, are you reading my mind? Should I be worried about that? -Well, as long as you're working for HTC instead of NSA I suppose I'm safe.. :salute
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What are good PSU brands in addition to Seasonic, and what are some brands folks don't like?
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What are good PSU brands in addition to Seasonic, and what are some brands folks don't like?
Hello Brooke,
there are several different "Brands / manufacturers" out there that have some models built by Seasonic, while their other models are built by cheaper and lesser quality companies..
I am using 2 Thermaltake PSU units that are built by Seasonic currently, on my 2 main computers
On another pc of mine, I have an older "Original" PC Power & Cooling PSU.... but all of the PC Power & Cooling PSUs for/from the last 5+ years are made by OCZ, who recently filed for bankruptcy... ( due to their poor quality in products wether it is pc ram, SSDs, PSUs, etc...
Corsair is the same way as I mentioned about Thermaltake
Antec started going downhill right after their Antec - II models came out, iirc of what Skuzzy told me.... and that was like around the years of 2003-2004???
Hope this is helpful
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TC
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I had a PC Power and Cooling 750W PSU that failed after two years and it was a pre-OCZ model. I replaced it with a Corsair TX-850 that's worked flawlessly for the past few years but, unlike a lot of the Corsair PSU's, this one's not manufactured by Seasonic.
If you buy a rated supply (bronze, silver, gold) and do the math to make sure there's nothing funny going on with the numbers and plan for a little overhead you're probably going to be OK.
And, as can be seen by my PSU choices, I always look for a single rail design so I know exactly what it can deliver.
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I had a PC Power and Cooling 750W PSU that failed after two years and it was a pre-OCZ
And, as can be seen by my PSU choices, I always look for a single rail design so I know exactly what it can deliver.
Sorry to hear about your short life of your pc p&c PSU, BE.... They carried a 5 year warranty on them, best I recall...
I too, only look for single 12v rail PSU units , preferably with a silver or gold rating these days... almost all seem to have at least a bronze 80% rating anymore....
«§». Merry Christmas everyone
TC
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My Antec EA-750 PSU I currently have lists its power output on the 12V rails, with 4 +12v rails each with a max load of 25A. I'm considering a new GPU, which requires a 42amp 12v rail and would like to know if my current PSU would suffice? The card I'm looking to run is a EVGA GTX 780 3GBhttp://www.newegg.com/Product/Product.aspx?Item=N82E16814130917 (http://www.newegg.com/Product/Product.aspx?Item=N82E16814130917). Would my current PSU be up to the task?
Back to the OP. Not too hot about Antec PSU's. I bought this one to as the backbone of my system built just over a week ago: http://www.newegg.com/Product/Product.aspx?Item=N82E16817139010 (http://www.newegg.com/Product/Product.aspx?Item=N82E16817139010)
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I believe this list with the side notes is still valid information: http://www.tomshardware.com/reviews/power-supply-oem-manufacturer,2913.html (http://www.tomshardware.com/reviews/power-supply-oem-manufacturer,2913.html)
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Back to the OP. Not too hot about Antec PSU's. I bought this one to as the backbone of my system built just over a week ago: http://www.newegg.com/Product/Product.aspx?Item=N82E16817139010 (http://www.newegg.com/Product/Product.aspx?Item=N82E16817139010)
I had the HX850 version. My first one made a bad buzzing sound at start up and the 5v rail was dead. After the RMA the second one made a rattling sound and had a terrible load dependent coil whine. (When I start up a power demanding task you hear the thing go from like a *eeeeeee* sound to a *iiiiiiiiiiiiiiiiiiiiiiiiii* sound). And just a few weeks ago it died. First one was DOA and the second was dead in under a year. I refuse to buy corsair power supplies now.
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I had the HX850 version. My first one made a bad buzzing sound at start up and the 5v rail was dead. After the RMA the second one made a rattling sound and had a terrible load dependent coil whine. (When I start up a power demanding task you hear the thing go from like a *eeeeeee* sound to a *iiiiiiiiiiiiiiiiiiiiiiiiii* sound). And just a few weeks ago it died. First one was DOA and the second was dead in under a year. I refuse to buy corsair power supplies now.
According to my previous post here the HX850 is made by ChannelWell, who is known for cheap products. Both price and quality...
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It's too bad -- I otherwise would like Corsair based on its name. :aok
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It's too bad -- I otherwise would like Corsair based on its name. :aok
We just need a company called JUGS....
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(http://)
It's too bad -- I otherwise would like Corsair based on its name. :aok
You still can, just choose the model right:
(http://www.telemail.fi/petrin.atk-apu/Corsair.gif)
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so the Antec 750 i bought that claims 40A on the 12V rail is a lie?
can you test how many amps are at the plug?
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so the Antec 750 i bought that claims 40A on the 12V rail is a lie?
can you test how many amps are at the plug?
No, that could be right. It's actually conservative (50 amps total at 80% (750/12*0.8) with the other 10 to the other 12V rails) so at least they don't seem to be overstating it's capacity.
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I didn't see this in earlier threads:
http://www.extreme.outervision.com/psucalculatorlite.jsp
Crazy handy tool for calculating this stuff
The Interwebs can be used for something other than Aces High?
<S> HACK :cheers: