Should you have the exact amount of wattage in a build or a little bit extra in the power supply?

[PersistantPro]

So I am building a pc soon, and I was wondering if it is better to have the needed amount for your rig or extra wattage in a power supply?

 

[swifty_morgan]

what you need/add 100. most people buy by price. the cheaper the better. worst thing you can do. if you spent the extra 20 or 30 bucks and got a quality ps you wouldn't have to add 100 watts.

 

[Cons29]

not a good idea to max out a psu, you also have to consider future upgrades, capacitor aging, adding fans/hdd's.

also, efficiency is at it's peak at around 50% load

 

[PersistantPro]

what you need/add 100. most people buy by price. the cheaper the better. worst thing you can do. if you spent the extra 20 or 30 bucks and got a quality ps you wouldn't have to add 100 watts.

What about future upgrades, the better the graphics card, the more power usage. Wouldn't you want to choose a bigger power supply? Or is too much power a bad thing? 😛

 

[PersistantPro]

Ok so here is my build http://gyazo.com/ae9e0aa31c9e24f3aec9a4764f622dab http://gyazo.com/217370c83ba801ac20368375f681698c what power supply should I get including all of the things mentioned?

 

[i7Baby]

If you plan to change graphics cards or add more then plan ahead by getting a power supply that will meet your needs.

I bought a 750W power supply when I first built my pc with only one gtx560 in it. But I planned to get another one and then 2 gtx670s. All these are OK with a 750W power supply. But If I now change my mind and want 2 x r9 290's then I'd have to buy a bigger power supply. The new power supply then becomes part of the cost of upgrading. I might then go ahead with 2 x 290s or I might wait till gtx 800 series is released and at first get one then later two cards that my 750W psu can run.

 

[PersistantPro]

If you plan to change graphics cards or add more then plan ahead by getting a power supply that will meet your needs.

I bought a 750W power supply when I first built my pc with only one gtx560 in it. But I planned to get another one and then 2 gtx670s. All these are OK with a 750W power supply. But If I now change my mind and want 2 x r9 290's then I'd have to buy a bigger power supply. The new power supply then becomes part of the cost of upgrading. I might then go ahead with 2 x 290s or I might wait till gtx 800 series is released and at first get one then later two cards that my 750W psu can run.

Where/how can I see how much my rig will use or can one of you guys tell me how much? http://gyazo.com/217370c83ba801ac20368375f681698c http://gyazo.com/ae9e0aa31c9e24f3aec9a4764f622dab

 

[i7Baby]

http://extreme.outervision.com/psucalculatorlite.jsp

They add extra to make sure even a crappy power supply will work properly.

But get a good one per -http://www.tomshardware.com/answers/id-1804779/power-supply-unit-tier-list.html