Is my power supply good enough for SLI?

[Fralinboy]

Hello,

I built a computer about two years ago. Recently, I have been thinking about upgrading my GPU. However, I have also thought about purchasing a second of the same GPU I have and using SLI. However, I am worried I do not have the power to support that. So would my PSU be capable of supporting it, or would it be better just to buy a better GPU?

Current Specs:
Intel i7 3930k
GeForce GTX 680
16 GB RAM
ASUS p9x79 pro
Thermaltake Smart M 850W Power Supply
Also I will be trying to play games at 2560x1600 if that matters

Thanks!!

 

[clutchc]

All but one or two Thermaltake PSUs are very low quality. I've never heard of the "Smart M", so I don't know where to place it. What is the nameplate rating for the +12V rail(s)? Amps and total +12V watts.

 

[jaimelmiel]

yes it is.
http://www.realhardtechx.com/index_archivos/Page362.htm

 

[DonkeyOatie]

The Thermaltake Smart PSUs are tier 4 on this list. I would not use that power supply in your existing system, much less for SLI. Here is a Review conclusion. http://www.hardocp.com/article/2014/06/16/thermaltake_smart_sp850m_850w_power_supply_review/9#.VFyfVMmoqSo

The claimed 850W output is plenty for 2xSLI of GTX660, but will you be getting what is claimed on your older supply?