I'm going to presume this is the psu
http://www.pcbodega.com/pcbshop/index.php?c=69&p=8910
Not good.
First off the 12v rails combine for 36 amps -might get you through in a squeeze if you run a minimalist computer system...BUT..the kicker is this line "
Efficiency: 70%Min,at full load 230VAC/50Hz" -quite frankly that is abysmal- 70% of 500w = 350w ugh!
The psu is the heart of the computer system-a bad one can literally fry your system.
You're in Aussie- just over the ditch-so checking what's available here at an affordable price should also be available to you:
Vantec Ion2 + (Plus) 520w (model VAN-520C)....cheapest
Thermaltake Litepower 600w (model w0355)
Gigabyte Odin 585w
Vantec Ion2 + (Plus) 620w (model VAN-620C)
Vantec Ion2 + (Plus) 500w (model VAN-500N)
Thermaltake Litepower 700w (model w0356)
Vantec Ion2 + (Plus) 600w (model VAN-600N)
What description told you that you didn't have to upgrade your psu ? sounds very misleading.
There is a small black plug socket attached to the circuit board at the back of the card- you push a 6 pin PCIe plug from the power supply into it- the psu PCIe plug (it should be marked PCIe) can only fit one way into the card socket.
Installing a new power supply is not difficult.
Keep the power cord plugged into the psu and the wall socket (BUT NOT SWITCHED ON) while you work-touching the case/power supply as you work will greatly lessen the chance of you zapping anything with static electicity-unplug the cord when youre ready to take out the psu.
When installing it note what plugs and cables are attached before unplugging them to remove the psu- note how the cables are placed in the chassis and watch out for any cables secured by zip ties (cable ties)
Lay the case on its side.
As you unplug each cable , identify the same plug on the new power supply (you could make a note of each and its placement). Unscrew the screws attaching the psu to the case (usually 4 screws). The next step once ALL the cables are detached is to gently lift the power supply out of the case - WITHOUT hitting or contacting the other components- this may require some careful manipulation and I recommend that you bunch all the power cables first (tie them together) and lay them out of the way over the side of the case.
Fitting the new psu is the exact reverse of the above procedure.
The cables you will be unplugging/plugging in are:
A 20 or 24 pin motherboard plug (has its own cable)
A 4 or 8 pin auxillary motherboard cable (has its own cable)
A 6 pin PCIe cable (back of graphics card) ( 1 or 2 per cable)
1 SATA power plug (for SATA harddrive) or 1 molex plug (IDE harddrive) for every harddrive.
1 SATA or Molex plug (SATA or IDE) fro every CD or DVD drive.
A Molex plug for fans if they use the power supply to draw power.
Post back if you have any other questions or problems - we'll be here.