/ Sign-up
Your question

Video Card and Power Supply questions.

  • New Build
  • Power Supplies
  • Graphics Cards
  • Systems
  • Product
Last response: in Systems
October 20, 2012 12:06:55 AM


I purchased a new video card without knowing that I would need a better power supply to support it and without realizing that the card may not even fit inside my computer case. On the box there is a written requirement: "450 watt or greater power supply with a minimum of 24 amps on the +12 volt rail." My current power supply is 300 watts so I need to buy a new one, but advertising does not list amperage on the +12 volt rail, it only lists wattage. Can I expect to get the necessary amperage if I buy the necessary wattage? Also, How can I know if the video card and power supply will even fit inside my computer case?

Here are my systems dimensions:
Height 12.6"
Width 7.1"
Depth 15.8"

Model Number: DX4860

I have not opened the box for my new video card yet. I could just open it and see if it fits but I would like to know if I can get this information without doing that first. It is an EVGA Nvidia GTX 660 ti, Product Number: 02G-P4-3660-KR

Thank you

More about : video card power supply questions

October 20, 2012 12:24:28 AM

Okay, I did some looking around and finally found some images of the interior on newegg. Assuming all DX4860 models use the same chassis, you should be just fine to install a new PSU and video card. The PSU looks to be a standard ATX form factor, and it looks there's actually a ton of clearance for the GPU length, which surprised me.

You are good to go. :) 
a b ) Power supply
October 20, 2012 1:01:54 AM

A good quality 450w PSU would have a maximum of 37.5 amps, so yes.

If you want re-assurance, you can just tell us which PSU you're gonna buy.
Related resources
a c 155 U Graphics card
a b ) Power supply
October 20, 2012 1:02:13 AM

The spec sheet of the PSU should say the amperage of the various rails.

For instance, on this XFX supply.
The amperage's are listed as.
+3.3V@24A, +5V@24A, +12V@44A, -12V@0.5A, +5VSB@2.5A
So 44amps on the 12v rail.

You can also figure out how many Watts that is.
Voltage x Current (amps) = Power (Watts), so 12v x 44a = 528W on the 12v rail.
October 20, 2012 2:17:05 AM

Thanks for the help, greatly appreciated, I should be good to go now.