graphics card Minimum PSU Wattage Requirement question.

June 21, 2012 at 21:23:23
Specs: Windows 7
I'm looking to buy a new graphics card and the one i'm really interested in is a card with a Minimum PSU Wattage Requirement of 400 and my computer is only 300. Is that bad if i install the graphic card? please i really need help.

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June 21, 2012 at 22:03:56
If the graphics card requires 400 watts and your computer only has 300 then you only have one option and that is buy a 400 watt power supply.

If you install the graphics card with only 300 watts the worst that can happen is that the computer wont boot and even if it does it will very unstable as the power supply struggles to supply the needed power.


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June 21, 2012 at 23:11:34
There are video cards that works well with 300w unit. List the system specs

You know the real meaning of peace only if you have been through the war.

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June 22, 2012 at 00:52:01
I think StuartS is being a little conservative with his worst estimate. I would say that the worst that could happen would be that the PSU could blow because of the overload and possibly take out other components due to a momentary surge.

Either go for a less ambitious graphics card or else buy a new PSU rated at at least 450W. And don't buy just any no-name PSU; go for one of the well known brands (Corsair is my favourite but Google will turn up others); not all 450W PSUs are equal.

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Related Solutions

June 22, 2012 at 02:13:21
It is not the wattage, it is the quaility of the PSU, you need one with a single 12V 35A+ single rail.

Buy branded like Corsair or similar, not an el-cheapo

Googling is quicker than waiting for an answer....

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June 22, 2012 at 03:01:42
you need one with a single 12V 35A+ single rail
35 Amps on +12v rail is bit overkill even with gtx 670 installed.

This corsair unit is recommended by many members here.

If u aren't a gamer u can still find a card that works well with your 300w unit.

You know the real meaning of peace only if you have been through the war.

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June 22, 2012 at 04:03:06
Post your specific usage.
If you are planning any real gaming, you will be much happier with the gaming level graphics card so go for the power supply. If not, then there are quite a few cards you could go with.
If not gaming look at:
If you need extra video memory for Photoshop, Autocad, Video Editing, similar, try:

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June 22, 2012 at 06:57:00
All the above responses have merit.

The issue is really about how the card manufacturers dumb down the requirements.

Not all 400W PSUs are created equal and the graphics card may not be the ONLY power hungry hardware. Some CPUs draw quite a bit of power too.

Many PSU manufacturers fudge the numbers and/or supply larger than needed wattage on rails where it is not needed.

In modern systems the +12V rail of the power supply (PSU) is the most important rail. That is the rail that supplies the power to the CPU, graphics, and the drives.

You need to add up the +12V amperage draw and verify the +12V rail can supply the requires power with a cushion for overhead.

Conversion formulas are as follow: A=amps, V=volts, W=watts

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