Im planning to buy sapphire r9 380 dual-x 2Gb OC and according to game-debate it needs 500W psu and 33 amps. What does that mean? Should ONE of my +12v rails have that amperage or ALL of them combined? I have two of them one is 18 and the other is 18 amps too. Tnx in advance.
R9 380 psu
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Mousemonkey
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BerettaOnTheNightStand
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For my 380, I'm getting a 550W 80+ Gold (+12V@45.8A.) I recommend getting a PSU with at least 10-15 amps of buffer. The reasoning is as follows > a 380 needs about 30-35 continuous amps, but after extended usage (let's say after about 8 hours of uninterrupted usage) the overall amperage will drop about 10-15 amps. Personally, I'm using an EVGA SuperNOVA G2 550W 80+ Gold Certified Fully-Modular ATX Power Supply. These are a little pricier, but you don't really want to skimp on a PSU. It is literally the heart of your system, and if it dies, it might take everything with it.
BerettaOnTheNightStand
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I'm sorry, I realized I sorta just told you what I was using for my build, and didn't really answer your question at all. This should answer your question; in order to run an R9 380, you'll need a combined 30-35 of continuous amps. Where as your dual 18A rails only have a combined 26A. The combined amps of a multi rail is about 70-75% of if you were to add them together. Ex: 18 + 18 = 36, 72.5% of 36 is 26, therefor your combined amps are 26A.
Hope that clears things up
BerettaOnTheNightStand :
I'm sorry, I realized I sorta just told you what I was using for my build, and didn't really answer your question at all. This should answer your question; in order to run an R9 380, you'll need a combined 30-35 of continuous amps. Where as your dual 18A rails only have a combined 26A. The combined amps of a multi rail is about 70-75% of if you were to add them together. Ex: 18 + 18 = 36, 72.5% of 36 is 26, therefor your combined amps are 26A.
Hope that clears things up
Sry my mistake my total amperage is 45 not 36 so i will have around 32 combined amps and is that enough for r9 380 so my system can run stable
BerettaOnTheNightStand
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Where did the extra amps come from? Did you have another +12V rail you didn't know about? Or, are you referring to "Peak Amps"? Now that I think of it, you should have 41 combined amps since you do have a 500w PSU. That being said, you should have three +12V@18A rails. I should've asked you before, but does it say exactly how many amps the +12V rails supply? (it's usually right under where it lists the 12V rails.) But to answer your question, yes. If you have a multi rail PSU that can supply the +12V rails with a combined 32 amps of "Continuous Amps" that should be enough to power the 380. Just as long as you don't game for longer than 8 hours a day. But if you actually have 41A that would be better for extended use.
I should also state that calculating combined amps on multi rails isn't an exact science. There are a lot of variables, like the quality of the metals used to make the rails, and also how thick the rails are. Just so you know; basically, Rails are just thin narrow strips of conductive material on a PCB (printed circuit board) that carry electrical current from the AC/DC converter to the cables that plug into your motherboard, graphics card, etc... The main reason for rails is so that the current coming from the converter can be accurately monitored and maintained. This is why a lot of people are right in believing that multi rail PSU's are safer. The reason is because they are limited at lower currents, where as a single rail isn't. So if you don't have a good single rail with OCP (over current protection) you run the risk of blowing all the components connected to it. A good multi rail should still have OCP, but at the lower currents there isn't as much risk versus a single rail. Sorry for the long winded explanation.
I should also state that calculating combined amps on multi rails isn't an exact science. There are a lot of variables, like the quality of the metals used to make the rails, and also how thick the rails are. Just so you know; basically, Rails are just thin narrow strips of conductive material on a PCB (printed circuit board) that carry electrical current from the AC/DC converter to the cables that plug into your motherboard, graphics card, etc... The main reason for rails is so that the current coming from the converter can be accurately monitored and maintained. This is why a lot of people are right in believing that multi rail PSU's are safer. The reason is because they are limited at lower currents, where as a single rail isn't. So if you don't have a good single rail with OCP (over current protection) you run the risk of blowing all the components connected to it. A good multi rail should still have OCP, but at the lower currents there isn't as much risk versus a single rail. Sorry for the long winded explanation.
BerettaOnTheNightStand
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No problem, it's worth the time if it helped clear things up for you and other people. Again, sorry for the long winded explanations.
In short; Amps are calculated by dividing your total Watts by the number of volts. Ex: 500W ÷ 12V = 41A. It just really confused me when you said you only had two 18A rails
In short; Amps are calculated by dividing your total Watts by the number of volts. Ex: 500W ÷ 12V = 41A. It just really confused me when you said you only had two 18A rails
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