# Thread: Determine Amps of server

1. Aspiring Evangelist
Join Date
Jul 2009
Posts
442

## Determine Amps of server

Okay, I have always found this odd and do not understand enough to figure it out.

Any knowledgeable people would be cool.

My datacenter has given me 2amp circuit for my computer. It seems to run fine on it.

Looking at the back of my power supply it says the following

520Watt max

Input rating
100-240v~,50-60Hz
7A-3A

Output rating
+3.3V & +5V combined 150W max
12V combined current 39A max
(and a lot of other stuff on amps and volts for output).

Now, Watts = Volts * Amps.
So if I have 520watts and 12 volts would be 43 amps
If it means 520 watts and 3.3volts it would be 157 amps
However it seems to max at 39amps on the back for output.

I imagine input is all that matters here and at 520 watts and 100 to 240volts that would be
5.2 amps to 2.16 amps

And the thing says 7amps to 3 amps on the back for input.

So....I imagine that is the max it can pull before dying.

However, I have 4 drives, 4 ram sticks, and 2 quad core cpus all going and I would figure I am at least halfway or more of the power use.

And the power says it starts at 3amps anyway.

But I only get 2amps.

I am confused. Anyone want to clarify how this really works?
I cannot believe the computer is running on only 2 amps.

2. Aspiring Evangelist
Join Date
Jul 2009
Posts
442
This is what my remote reboot card is saying from the server.

Code:
```     	Temperature  	CPU Temp 1  	OK  	45 degrees C
Temperature 	CPU Temp 2 	OK 	17 degrees C
Temperature 	CPU Temp 3 	No reading
Temperature 	CPU Temp 4 	No reading
Temperature 	Sys Temp 	OK 	47 degrees C
Voltage 	CPU1 Vcore 	OK 	1.112 (+/- 0.004) Volts
Voltage 	CPU2 Vcore 	OK 	1.112 (+/- 0.004) Volts
Voltage 	3.3V 	OK 	3.312 Volts
Voltage 	5V 	OK 	4.920 (+/- 0.012) Volts
Voltage 	12V 	OK 	11.712 (+/- 0.048) Volts
Voltage 	-12V 	OK 	-12.300 (+/- -0.050) Volts
Voltage 	1.5V 	OK 	1.472 (+/- 0.008) Volts
Voltage 	5VSB 	OK 	4.968 (+/- 0.012) Volts
Voltage 	VBAT 	OK 	3.216 (+/- 0.008) Volts```

3. Junior Guru
Join Date
May 2006
Posts
238
All those numbers are "maximum" values. Depending on your exact hardware specs, you are most likely pulling around ~300 watts max and much less at idle.

300W

@ 120V = 2.5A
@ 208V = 1.44A
@ 240V = 1.25A

To get a more accurate power consumption number you will have to list your specific hardware such as Processor model, mainboard model, RAM type (DDR, 2, 3 FBDIMM), RAID card model.

4. Web Hosting Master
Join Date
Jun 2003
Location
Las Vegas, NV
Posts
842
It's pretty simple to give you an estimate of your power draw if you publish your hardware configuration. Just post your exact hardware specs and either I or many others here can give you a pretty good idea how much power your hardware is actually using.

5. Web Hosting Master
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Aug 2009
Location
Orlando, FL
Posts
1,063
You can use an ampmeter. They have ones that hook up as multimeter attachments, or you could use a metered wall outlet model like this:

http://www.p3international.com/produ.../P4400-CE.html

6. Aspiring Evangelist
Join Date
Jul 2009
Posts
442
cool. I thought you could tell from your power supply what your min/max should be and it is odd the number on the back does not actually jibe with real use.

My hardware adds up to much less, though much of the hardware does not say a lot about it self (like the drives).

However, for the power supply to say 3 to 7amps and not actually use 3 as a minnimum is a bit of a shocker for sure.

But I have not had any issues with my datacenter and the 2 amps thing...weird

7. Junior Guru
Join Date
Jun 2005
Location
New Jersey
Posts
219
Check out newegg and look for a kill-a-watt meter.

8. Web Hosting Master
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You should probably figure out why the CPU temperatures are so disproportional.

While it's not unusual to be off a few degrees on boards that have a staggered chip setup, I'd say a 28 degree variance is far beyond the measure of acceptable, to say the least.

9. server automation specialist
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Apr 2009
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whitehouse
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yes, execute the sensors command on the server as well and it would give a reading of the cpu temp.

Originally Posted by porcupine
You should probably figure out why the CPU temperatures are so disproportional.

While it's not unusual to be off a few degrees on boards that have a staggered chip setup, I'd say a 28 degree variance is far beyond the measure of acceptable, to say the least.
As for the power consumption, though the smps ratings says 3-7 amps which would the ideal condtions for it , every device has a tolerance limit that enables them to go below the minimum listed or go above the maximum listed ratings.

I imagine input is all that matters here and at 520 watts and 100 to 240volts that would be
5.2 amps to 2.16 amps

And the thing says 7amps to 3 amps on the back for input.

So....I imagine that is the max it can pull before dying.

10. Aspiring Evangelist
Join Date
Jul 2009
Posts
442
Originally Posted by porcupine
You should probably figure out why the CPU temperatures are so disproportional.

While it's not unusual to be off a few degrees on boards that have a staggered chip setup, I'd say a 28 degree variance is far beyond the measure of acceptable, to say the least.
the server is a development server at the moment and is almost completely docile. I would expect the cpu use to be very small and since there are two quads of 2.x ghz running...I assumed the degrees would be low as the cpu was barely being used at all.

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