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How Many Volts, Amps, and Watts Does This Cable Support??

post #1 of 11
Thread Starter 
I have a Coolmaster Real Power Pro 650w psu. It has five 4 pin peripheral connectors and I have no idea to find out how many volts, watts, or amps 1 of the cords can handle. I wanted to find out how many things I can plug into it with full power to each. Please help me!

Heres a link..
http://www.coolermaster.com/products...te=173&id=2562
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post #2 of 11
Volts x Amps = Watts
4 pin molex connectors are 12 volt.

There should be a plate on your PSU that states how many Amps each rail will supply.
3.3V, 5V, 12V, etc.

Note that if you add up the Amperage off all the rails it will add up to more that the PSU can put out. Each 12 rail (molex) may be rated for 20 amps, but the total Amps that the PSU can supply to all the 12V rails is less. For example (I don't know the exact specs for your PSU and the linkey you posted was a blank page) each of the 12v rails may be rated for 20 Amps (4 x 20 Amps = 80 Amps, 80 Amps x 12v = 960 watts), but I'm sure your PSU won't put out 960 watts.

It's all on the label. And it's all marketing hype.
Edited by billbartuska - 8/4/08 at 4:35pm
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post #3 of 11
Thread Starter 
Ok, but I dont understand the chart, i mean how do I know which is the molex ones?
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post #4 of 11
Thread Starter 
AC INPUT 115/230Vac 10/5A 60/50Hz
Load +3.3V +5V +12V1 +12V2 +12V3 -12V +5Vsb
Maxload 25A 25A 19A 19A 19A .8A 3.5A
Maxpower [ 191w ][ 540w ] 9.6w 17.5w
[ 650w ]

That was spaced out all nice 2 seconds ago.
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post #5 of 11
Quote:
Originally Posted by NewAtOCing View Post
AC INPUT 115/230Vac 10/5A 60/50Hz
Load +3.3V +5V +12V1 +12V2 +12V3 -12V +5Vsb
Maxload 25A 25A 19A 19A 19A .8A 3.5A
Maxpower [ 191w ][ 540w ] 9.6w 17.5w
[ 650w ]

That was spaced out all nice 2 seconds ago.
12v1 + 12v2 + 12v3 = 19A+ 19A +19A = 57 Amps
57 Amps x 12v = 684 watts
Total power for the 12v rails is stated to be 540 watts,
So, you can not load each of the three 12v rails to it's max amperage as the PSU will only supply 540 watts to the 12v rails conbined, not 684 watts.

And further, the total max power for all the rails is stated to be 650 watts, but if you add up all the various voltage rails that comes to 758.1 watts (191w + 540w + 9.6w + 17.5w = 758.1 watts), but again you can't run all the rails at their rated wattage because that adds up to more power than the PSU can supply.

So, if you put 38A (19A on each of two 12v rails) that's a total of 456 watts. That leaves only 84 watts (7A) for the remaining 3rd 12v rail.

The same scenario applies to the rails with other voltages. If they are loaded to the max, there won't be even 540 watts left for the 12 rails (650 - 191 - 9.6 - 17.5 = 431.9 watts, not 540 watts (much less 650 watts!).

See...........Marketing hype that confuses nOObs! "I've got a 650 watt PSU, how can that be a problem?" Well, it's possibly really only a 432 watt PSU!

And it gets worse........

That total power rating (650 watts) is established at some operating temperature, perhaps (as some PSU manufactures do) at a temperature that is just before the PSU bursts into flame! Not the condition were the typical user will be operating. Note that Antec, like many others, does not specify the temperature at which their specs are established.

And it gets still worse.......

When you start to get near the limits for a PSU, voltages can't be maintained. As amp draw gets near the limit that the PSU can supply, voltages start to drop. Yeah there's a wide spec for acceptable voltages for most components, but if you're overclocking to the limit, those voltage changes can kill stability.
When I was OCing I used a PCP&C 1 killowatt PSU to power the motherboard (basically the CPU) only (no video cards, no HDDs, no fans, no pumps, etc). I got 12.03 volts no matter what the overclock was. Overkill? ...probably. But I knew that when a OC was unstable, it wasn't because of the PSU!

When all is said and done, reading and understanding the specs and being aware of the fact that you get what you pay for will lead to a PSU that won't be a problem for your particular set up.
Edited by billbartuska - 8/5/08 at 8:10am
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post #6 of 11
Quote:
Originally Posted by billbartuska View Post
See...........?

I do.

But the real question is: can any of us remember it?.

Rofl.
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post #7 of 11
Thread Starter 
Wow, +1 bill! I'm gonna have 9 fans pluged in when I get my water cooling set up. At max its .25 amps per fan if I figured this out correctly. And that a little overkill because not all my fans are that strong.
http://www.petrastechshop.com/12scsysstcaf2.html

So if I plugged 9 fans into one 12v rail I would be fine? That's only 2.25 amps. My pump is going to be 2 amps. Then I have my mobo, 2 hard drives, and my graphics card.
I can't find the specs for the hard drive amp usage but I did find the graphics card. At max power it required about 225w. On a 12v rail that's right at 19 amps.

You said I get 540w, divided that by 12 and got 45amps total for my rig. I added my g card, fans, and guessed 4 amps for 2 hdds and get a total of 25.25amps, that leaves me roughly 20amps for the mobo. Hows my math? I kinda just went out on a limb for this.

How do I know what 12v rail is what plug? I assume one is for the graphics card. But I don't know what the other are.
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post #8 of 11
Quote:
Originally Posted by NewAtOCing View Post
You said I get 540w, divided that by 12 and got 45amps total for my rig.

How do I know what 12v rail is what plug? I assume one is for the graphics card. But I don't know what the other are.
No, you only get 45 amps "for your rig" if the other rails don't steal part of it.

As for which plug is 12v1, 12v2, etc. it probably doesn't matter as all the connectors are, in reality, hooked to a single 12v power source. And if not, and you overtax a rail, you'll just get a no boot since there won't be enough power.

Don't forget, CPU, optical drives, sound cards, NIC cards, USB ports, etc all use power too.
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post #9 of 11
Thread Starter 
Cpu is 65 watts, probably at 12v so thats 5.5amps. Sound card ill just put at 4 amps because I have no idea. Each usb port is 1 amp, and i use 2 so 2 amps for that. I found hard drives each use 1.08 amps at idle so lets say 3 for both drives. That would be roughly 35 amps. I think i'll be fine, just as long as I split up all my fans and pump and all equally between my 5 molex connectors. Do you agree?
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post #10 of 11
Quote:
Originally Posted by NewAtOCing View Post
Cpu is 65 watts, probably at 12v
No CPUs are on the 3.3V rail.

And yeah, what you said should be good.
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