Can my system handle 2 GTX 660ti's?

I already have one GTX 660ti installed and was wondering if my system can handle another one. Here is what I have:
PSU - Cooler Master Silent Pro M - 850W
GPU - GeForce GTX 660ti PE MSI (2GB, 192 bits)
CPU - AMD Athlon II X4 645 Propus 3.1Ghz (95W)
MB - ASUS M4N98TD Evo Nvidia nForce 980a
RAM - G.Skill Ripjaws Series 8GB (2 x 4GB) [16GB total]
HDD - Seagate Barracuda 7200 500GB (x4, in RAID)
Yes, I know some of these are a few years old. But, that's what I have to work with. I'm assuming that the power demand of 2 660ti's will be too much for my PSU. But, I figured I would ask in case I'm wrong. If it helps, below are links to some of the above components on NewEgg.
MB -
If there is any other info that is needed, just let me know. Thank you, in advance, for your time and input.

@Robax91 - Yes, everything is SLI compatible. Not to worried about bottle-necking, because I know I'm going to get some with my system. Question 1, though simplified (excellently I might add), is basically what I'm asking. Question 4 is a great question and wouldn't mind if it got answered. And yes, I do need a new CPU & MB. :D Thanks for that link, that's a nice website.
As for the RAM, I have 16GB (4 x 4GB), sorry for the confusion. Specs are: DDR3 SDRAM 1333 (PC3 10666), Latency - 9, Timing - 9-9-9-24-2N, Voltage - 1.5V, Unbuffered, Dual Channel Kit.
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  1. Lets make a few questions clear for everyone:

    1. Will the 850w PSU support another 660ti?
    2. Does this setup have SLI capability (PSU and MB have SLI compatability)?
    3. Is there going to be a bottle-neck (CPU, RAM, HDD)?
    4. Will it be worth the cost of another 660ti for the performance gain?

    I'm sure a slew of people just want to tell him to get a better CPU/MB combo, but keep in mind what he is asking about rather than posting a pcparticker build without answering his question.
  2. Best answer
    I used this website to calculate your SLI setup and I even put in an overclock to see if it was too much. Your system with SLI will be about 600w, you are good for it as long as that PSU has enough connectors for 2x 660ti SLI.

    PSU calculator:
  3. Another thing to point out is that on older CPUs, the lack of an L3 cache can make an impact on performance, especially for newer games. You should also clarify the RAM specs as well just to see the whole picture (mhz, timing, and how many modules) because 2x4GB would be 8GB, but it says 16GB total. Is that 4x4 sticks or is there something left out.
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