Hi, I bought a new computer and was wondering if my power supply would be enough because I changed the video card on the computer. The model name for the computer is hpe-421f (HP onboard) and I changed the video card which was in the computer to a GTX-460. The current power supply I use is a Corsair 550W power supply. Thanks in advance and if you guys need to know anything else about the computer please tell me. TY.
550w is sufficient, I've just looked at the specifications of the HPE-421F. But make sure you have enough amperes (peak wattage divided by 12 as that is how many amperes will be needed on the +12V rail(s)).
One of my systems has an OC'd Q9550, 4 GB RAM, a GTX260 - a card with similar power requirements to yours, a Gigabyte EP45-UD3P motherboard, 3 hard drives and an optical, and a Soundblaster card all powered by a Corsair 750TX.
Running 3 instances of Prime95 to load the CPU and 3DMark06 to load the GPU, it pulls 375 watts from the wall as measured by my Kill-a-Watt meter. Figuring 80% efficiency, the system pulls 300 watts from the PSU.
So, yes, a 550VX is certainly much more than adequate. With a full system load, it will be running around 60% of capacity.