I want to add more ram to my computer but is the power supply good enough?

i have a dell 8400 but it only has 1gb(2 x 512mb) of ram i want to add more since windows 7 takes up 1 gb i wan to add another 1gb(2 x 512mb) and i was wonder if the power supply wont go up in smokes heres the specs for it - 400W Power Supply Replacement PSU - One (1) 20+4 ATX power connector (supports 20-pin... show more i have a dell 8400 but it only has 1gb(2 x 512mb) of ram i want to add more since windows 7 takes up 1 gb i wan to add another 1gb(2 x 512mb) and i was wonder if the power supply wont go up in smokes heres the specs for it
- 400W Power Supply Replacement PSU
- One (1) 20+4 ATX power connector (supports 20-pin and 24-pin)
- One (1) 12V P4 ATX power connector (4-pin)
- Three (3) large power connectors (4-pin)
- Three (3) SATA power connectors
- One (1) PCI-Express power connector (6-pin)
- One (1) Dell P6 (6-pin)
- One (1) small power connector (4-pin)
- One (1) 4-pin HP Power
- Quiet/Low-noise Operation
- Support 6-pin Auxiliary Cable
- Highly Efficient
- Over Power and Voltage Protection
- Designed by Athena Power
DC Output:

Load Max
+3.3V 16A
+5V 21A
+12V 21A
-5V 0.5A
-12V 0.8A
+5VSB 2.5A
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