Why would I need a higher w power supply?

100 Blood Elf Death Knight
10460
Here's my build,

CPU: Intel Core i5 3470
MOBO: ASRock LGA 1155 Intel Z75 DDR3 PRO3
MEMORY: G.Skill 8GB DDR3 1600 12800 RAM
GPU: HIS IceQ Radeon HD 7870
POWER SUPPLY: CORSAIR CX500 500W
HARD DRIVE: TOSHIBA 1TB 200 RPM 3.5" SATA

Why would I need a 700+ power supply?

I use it primary to play WoW and do college stuff...
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86 Tauren Paladin
8840
You wouldn't, even the 500 W that you picked will supply more than enough power
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90 Blood Elf Warrior
5740
Although the CX series PSU's aren't as good as say their gold series, seasonic to PPNC, its still plenty good for your setup.
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100 Tauren Druid
14495
I can assure you that PC at full loud will only use maybe 450W.

here is what I use on my PC and I run a Corsair TX650M gold power supply.

Case: Cooler Master Cosmos 2
Exstra fans, 5 Cooler master Excalibur 120MM fans
Motherboard: Asus Sabertooth P67 1155, high end gaming motherboard
CPU: Over clocked I5 2500K 4.4Ghz air cooled
GPU Asus 570 Direct CU II 1.2GB
Ram: G-skill sniper 1866 4x4GB 16GB total DDR3
HDD 1: G-skill sniper SSD 245 R/RW
HDD 2: Western Digital Cavalier black 7200RPM 500GB Sata
PCI Card: Avermedia live Gamer HD
Keyboard: Logitech G15
Mouse: Razer Deathadder black edition
Mic: Logitech USB Desktop Microphone (Black/Silver)
Webcam: Logitech HD Pro Webcam C910

Soon I will have my Cooler Master Seidona 240M CPU cooler
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90 Blood Elf Warrior
5740
This site is pretty accurate: http://www.extreme.outervision.com/PSUEngine

It says max load for your PC is around 275W (which I would agree with) and recommends 330+.
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86 Tauren Paladin
8840
The only downside is that that site doesn't account for overclocking your gpu, which is a pretty large amount of power unaccounted for
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90 Blood Elf Warrior
5740
The only downside is that that site doesn't account for overclocking your gpu, which is a pretty large amount of power unaccounted for


HD 7870 uses dual 6 pin PCI-E Connectors which mean it's max TDP is 225, not much higher than stock.
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100 Human Priest
8625
The other thing to keep in mind is future proofing. Maybe at some point in time you want to add a second video card; a larger power supply will mean only one upgrade instead of two.

That said, don't build your system around what you MIGHT do, just what you plan to do. If you don't plan to add a second card later on, don't buy a huge power supply.
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