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520, 620 or 650W Seasonic

The built I'm aiming for:
CPU: i5-3570K
CPU Cooler: Cooler Master Hyper 212 Evo
Mobo: ASRock Z77 Extreme4
RAM: Crucial Ballistix Tactical LP (2x4GB)
GPU: Sapphire 7870 XT 2GB
SSD: Samsung 840 Pro 256GB
HDD: Seagate Barracuda 1TB (7200rpm, 64mb)
Case: Fractal Design Define R4 with 3 140mm coolers
Optical: Combo Blu-ray drive + DVD-burner or separate ones (last option is cheaper for some reason)

I intend to overclock CPU/RAM/GPU but no Crossfire.

Now I heard good things about Seasonic PSU's but which one should I go for, the M12II-520, M12II-620 or M12II-650W version? Or are there better choices?
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151093
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151095
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151106

Over here they're €66, €74 and €82 respectively (i.e. $20 difference between 520 and 650)
4 answers Last reply Best Answer
More about 520 620 650w seasonic
  1. Best answer
    A 500 watt 80 plus certified psu should be able to handle that rig. You should get the 520 watt but if moneys no problem then no ones stopping You from getting the 650 watt, though if you want to stay on the safe side, then i would recommend the 620 watt for plenty of overclocking headroom but the 520 watt should be enough.
  2. Overclocking does require a tad more power from the PSU, I'd go for the 620 watt PSU, just to play it safe. Some things that recommendations do not account for are external devices and the possibility of other addtions later on, or a video card upgrade.
  3. Like the others said, I'd go with the 620W one, too. 12€ difference isn't much and you're on the safe side and will have enough room for overclocking or additional components.
  4. Went for the 620W version, thanks for the advice
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