# How many amps am I pulling? 19? Please check.

#### travalon

##### Distinguished
Ok this is an offshoot of another thread I started. I apologize if I am in error in starting a new thread but it
applies to more than just running a monitor off a psu. (My other thread)

Trying to figure out:

1. total amps drawn from the 12v rail
2. Question: does the 12v rail constantly push out 28 amps? (I don't think this to be the case)
3.is there a way to throttle down/limit/manually adjust the amperage with
an inline resistor or Potentiometer if it is a constant 28 amps?
4. Why wouldn't an inline 4 ohm resistor limit the amps to 3?

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I googled it (DUH)... So Watts = Amps x Volts - therefore - Watts/Volts = Amps

My PSU - CORSAIR Builder Series CX430 V2 (CMPSU-430CXV2) 430W ATX12V v2.3
80 PLUS Certified Active PFC Power Supply

+3.3V@20A, +5V@20A, +12V@28A, -12V@0.8A, +5VSB@3.0A

My Mobo - H67M-ITX/HT
Here is shows a Maximum tdp of 95 watts (95/12= 7.91 - 8)
http://www.itxgamer.com/tools/compare-motherboards/

Here it shows under heavy load while grinding out Prime95 simultaneously with a i5 2500k (95 watts, 8 amps)
with 3DMark06 a total system draw of 120 watts w/a i5 2500k (120/12= 10)
http://www.itxgamer.com/motherboards/asrock-h67-itx-reviewed/

My Chip - i3 2100
65 watts (65/12=5.4 - 5)
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115078

MY RAM - 2 x 4gb G.Skill RipSaw 1600
1.5 v
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231426&Tpk=N82E1 6820231426

My GPU - PNY GT 430 fermi
49w (49/12=4.08 - 4)
A minimum 300W or greater system power supply (with a minimum 12V current rating of 22A)
http://www.newegg.com/Product/Product.aspx?Item=N82E16814133356

MY HHD - Seagate 500 Gb 7200 rpm Hybrid SSD x2
+5v @ 0.58 amps x 2 (3 watts x 2 = 6 watts) doesn't count though
http://www.newegg.com/Product/Product.aspx?Item=N82E16822148591

Liteon 1633 SOHW DVD DL drive IDE 12v @ 1.5 -2 amps and 5v @ 1.5 amps

Mobo 8 amps
GPU 4 amps
TTl 12 amps - where as above @ 120 watts it shows 10 amps W/o GPU but the i5 alone pulls 8 amps so it could really be 16 amps. + 4
I3 5 amps
DVD 2 amps

with the i3 8+4+5+2= 19 amps Total
With the i5 and no video card it looks like 18 amps + 4 GPU =22amps

If my monitor only pulls 3 amps then I should have 6 amps to spare. and with my current GPU and an i5 I should still have 3 to spare.
Please correct me if I'm wrong.

THX

#### GhislainG

##### Titan
It will draw only as many amps as are required. Adding an inline resistor doesn't make sense as it will increase the power draw. You can't use the COM1 header to connect a USB device.

#### travalon

##### Distinguished
Just learned that thx G