Hi all,

I am planning to add another GTX 1070 to my computer but I was wondering if the POWER supply I already have can handle two cards.

Asus Sabertooth 990fx r2
Amd FX-8350 black ed
Corsair H55 v2 Quiet CPU cooler
Asus Geforce GTX 1070 Strix OC 8GB
Kingston hyper fury 16G 1866Hz
Corsair CX600M
SAMSUNG 840 EVO 120 GB SSD
Seagate SSHD 5400RPM 500 GB
Dell Ultrasharp U2412M 1920x1200

Hi,

Just stumbled upon your post, I faced a similar problem when building my system last year, thought I might be able to offer some help.

I used a power consumption calculator to get a rough estimate of your system's power demand (search on Google for tools like that), and found you need around 530W if you are going for a SLI setup of 1070s. Of course this number varies a bit, and I wouldn't take it as an exact REFERENCE, but given your power supply (CX600M), RUNNING a system above 500W seems to be a bit tight. Note that there is nothing wrong with using a 600W PSU on a say 550W system, although it's less efficient. This also depends on how much time you are using your system on load.

From my past experience, I was aiming for a dual 970 setup for a future upgrade, with an estimate of about 550W power draw. I ended up getting a 750W power supply, just to be safe.

I think a 600W power supply would work. If your system is new (which it seems to be) and you don't want to spend extra budget on a new PSU, you don't have to. But if you want more headroom for the system, upgrading to a 750W or 850W is also an option. Upgrading will also reduce the load on the PSU, making it more quiet (fan doesn't need to turn on all the time) if you care about noise.

I'm no expert at PSUs nor PC building, I'm just sharing my decision making process when I built my system, so feel free to point out any mistakes I made Thanks for the input thomasC1989. I used coolermaster.com/power-supply-calculator/ and it showed an estimate of 560 W required for two 1070s based on the system I have so I believe I will need a PSU upgrade too just to be safe.Yeah, BETTER safe than sorry. Anyways, good luck on your new system upgrade! let us know your performance gains with the 2nd 1070...