Sign in with
Sign up | Sign in
Your question
Solved

What power supply do I need?

Last response: in Components
Share
February 8, 2013 6:32:30 PM

Hello there,

I'm a short-time reader, first-time writer. I've been buying components for my PC for a couple of months and the stock PSU that came with my case isn't very good. Ergo, in order to run the graphics card I am getting, I will need to upgrade my power supply. I was looking at the Antec Earthwatts 500W PSU. The store manager at Wintronics tells me that I need the Antec Earthwatts 750W PSU.

Here are the links:

500W PSU- http://wintroniccomputers.com/323-4334/power-supplies/a...

750W PSU- http://wintroniccomputers.com/323-4337/power-supplies/a...

Now here are the specs for my PC.

CPU: FX-4100
MOBO: M5A78L-MLX PLUS
GPU: Sapphire 7850 2GB
RAM: 2x4GB RAM
HDD: Seagate 500GB SATA

Now then, the question is: do I really need the 750W PSU? My MOBO is holding all the RAM it can handle. It only has one PCI-E 2.0 slot that will be taken up by the 7850, so it's not like I need the extra 6-pin and 8-pin power cords. Both of the power supplies are 80PLUS Certified. They both have active PFC. So is the store manager trying to squeeze me for more cash?

More about : power supply

a c 1168 ) Power supply
February 8, 2013 6:44:02 PM

For a system using a single reference design Radeon HD 7850 graphics card AMD specifies a minimum of a 500 Watt or greater system power supply. The power supply should also have a maximum combined +12 Volt continuous current rating of 27 Amps or greater and have at least one 6-pin PCI Express supplementary power connector. Some of the non-reference design Radeon HD 7850 graphics cards require at least two 6-pin PCI Express supplementary power connectors.

There is a SAPPHIRE HD 7850 2GB GDDR5 model where Sapphire states that 2X75 Watt 6-pin PCI Express power connector is required.

The Antec EarthWatts Series 500 Watt (EA-500), with its maximum combined +12 Volt continuous current rating of 34 Amps and with two 6-pin PCI Express supplementary power connectors, is more than sufficient to power your system configuration with a single Radeon HD 7850 graphics card.
m
0
l

Best solution

a b ) Power supply
February 8, 2013 6:47:28 PM

You absolutely do NOT need a 750W power supply. The 500W is more than sufficient to run the parts you've listed.

He's trying to squeeze you.
Share
Related resources
February 8, 2013 6:48:02 PM

The specs say 2x75W power cords are required for Crossfire. Only one 6-pin is required for the use of one card.
m
0
l
February 8, 2013 6:49:00 PM

rwpritchett said:
You absolutely do NOT need a 750W power supply. The 500W is more than sufficient to run the parts you've listed.

He's trying to squeeze you.



Thank you for your response. I kind of felt like someone was tickling my udders.
m
0
l
February 8, 2013 6:53:10 PM

Best answer selected by meetreez.
m
0
l
a c 1168 ) Power supply
February 8, 2013 6:54:48 PM

meetreez said:
The specs say 2x75W power cords are required for Crossfire. Only one 6-pin is required for the use of one card.

You never specified exactly which model you have. Sapphire makes more than one model of SAPPHIRE HD 7850 2GB GDDR5 card. There are some models that require one 6-pin PCI Express supplementary power connector and others that require two 6-pin PCI Express supplementary power connectors.
m
0
l
February 8, 2013 6:55:00 PM

ko888 said:
For a system using a single reference design Radeon HD 7850 graphics card AMD specifies a minimum of a 500 Watt or greater system power supply. The power supply should also have a maximum combined +12 Volt continuous current rating of 27 Amps or greater and have at least one 6-pin PCI Express supplementary power connector. Some of the non-reference design Radeon HD 7850 graphics cards require at least two 6-pin PCI Express supplementary power connectors.

There is a SAPPHIRE HD 7850 2GB GDDR5 model where Sapphire states that 2X75 Watt 6-pin PCI Express power connector is required.

The Antec EarthWatts Series 500 Watt (EA-500), with its maximum combined +12 Volt continuous current rating of 34 Amps and with two 6-pin PCI Express supplementary power connectors, is more than sufficient to power your system configuration with a single Radeon HD 7850 graphics card.


Thank you for helping me out. I wish I could select multiple "Best Answers" as you have both helped out so much. :) 
m
0
l
!