Solved I need to get a new PSU soon

October 9, 2013 at 20:52:18
Specs: Windows 7, Intel i5 Sandy Bridge 2500k, 4GB G.Skill Ripjaws
Okay so here's my situation.

My computer (desktop) requires a new PSU since I'm going to install a new graphics card soon.

By using Thermaltake's Power Supply Calculator it turns out that I would need 725 watts.

So here's my question..

If I were to buy say, an 850 watt PSU, Would my computer be at serious risk of being damaged if I installed it?

The reason why I want an 850 is so if I need to put in hardware that requires higher voltage I can do so without a lack of voltage.

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October 9, 2013 at 23:10:09
No it won't damage it at all and it would be a good idea to go for a higher rated one anyway. The stated wattage is just what it is capable of supplying but it will rarely, if ever, be actually running at its maximum so it gives you leeway. The more important things to check are the current ratings for each line, the voltage has no actual bearing on different PSUs as they all supply the same voltages, it is the amount of current they supply that is the variable.

"I've always been mad, I know I've been mad, like the most of us..." Pink Floyd

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October 10, 2013 at 05:56:12
✔ Best Answer
I highly doubt you need an 850W PSU, regardless of what some calculator tells you. Wattage is NOT the most important spec to consider. PSU design (single +12v rail vs multi +12v rail), amperage distribution, efficiency rating, etc are much more important things to consider. Please post your complete system specs & the make/model of the graphics card you plan on getting.

Newegg currently has most of the Corsair PSU lineup on sale with rebates. This 430W is a forum favorite, it's JonnyGuru recommended, 80 plus certified, single +12v at 32A, & can be had for just $20 (after rebate):

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October 10, 2013 at 06:12:53
As others have stated, Wattage is not the most important thing. That is like buying a motor car solely on the basis of its top speed without taking into consideration things like acceleration, fuel consumption, handling and load carnying capacity.

You could connect a 2000 watt PSU if such a thing were available and it would not do any harm.

Amps are the important thing but Amps and Watts are related as are volts. To understand the relationship you need to understand Ohm's Law. It is not complicated and once you understand it, the differences between Watts, Amps, Volts and Resistance will become clear. Resistance is the thing that underpins them all as Georg Ohm discovered. The Hydraulic analogy is a good way to get your head around the concepts.'s_law


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October 10, 2013 at 20:58:23
I agree with ALL of the above suggestions. If you choose a quality power supply that is properly made for a modern system, you will not need anywhere as much overall wattage as they are recommending, therefore saving a lot of money. Yes, it pays to have a power supply for any reasonably possible upgrades in the near future, but do not overdo it. For example, having enough power for running two hot gaming cards at once (SLI, etc), when you plan on mild to moderate gaming is ridiculous since you will never need it. As riider suggests, list your specs in detail and your choice of graphics card as well as your typical uses and we can advise you better.

You have to be a little bit crazy to keep you from going insane.

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