Will this work with a 750W power supply?

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Guest

Guest
This is my current setup:
Gelid Tranquillo Rev.2 processor cooler
Corsair Vengeance 2x 4GB 240pin DDR3 1866 MHz
WD Blue WD10EZEX 1TB HDD
Samsung SH-118AB DVD reader
Corsair CX Modular CX750M PSU
Intel Core i7 4770k
MSI Z87-G45 Gaming motherboard
MSI GTX 770 2GB GDDR5 videocard
Samsung 840 EVO Basic 120 GB SSD
Furthermore the case itself has two fans with blue leds.

This works perfectly fine, but as I want to upgrade to a 2560x1080p display later and still play everything on highest settings and with at least 50fps, I want to add a second GTX770 2GB video card. I was wondering if I should upgrade to a 850 Watt PSU (and if so, which one will do? Preferably Corsair as well). Because I've read different things on the internet. Some sites say 750W will do, others say you need at least 850W.