user22850: A Radeon HD 7950 has the following hash rates:

Around 600 MH/s for Bitcoin
Around 600 KH/s for Litecoin

I used the profitability calculator at bitcoinwisdom to estimate revenue:

Bitcoin: 0.06148 USD / Month  
Litecoin: 0.6661 USD / Month

Am I missing something? Less than 1 dollar per month? Is it because of the specialized mining hardware?

user5406: No you are not missing anything. CPU mining has been unprofitable since 2011, GPU mining just slightly later. 
Today, ASICs rule mining. The Bitcoin network has more than 300 Phash/s by now, that is 300,000,000,000 Mhash/s.
The upcoming ASIC miner generation is announced to provide more than 9,000 Mhash/s per Dollar. Times for GPU/CPU mining are long gone.
The situation is largely the same for Litecoin with a slight delay.
Also see: Why does mining profitability tend towards zero?
There might be some altcoins that can still profitably CPU/GPU mined and traded for Bitcoin thereafter, but I am not sure even they are worth when you factor in time investment.

22850: <p>A Radeon HD 7950 has the following hash rates:</p>

<ul>
<li>Around 600 MH/s for Bitcoin</li>
<li>Around 600 KH/s for Litecoin</li>
</ul>

<p>I used the profitability calculator at <a href="https://bitcoinwisdom.com/bitcoin/difficulty" rel="nofollow noreferrer">bitcoinwisdom</a> to estimate revenue:</p>

<ul>
<li>Bitcoin: 0.06148 USD / Month  </li>
<li>Litecoin: 0.6661 USD / Month</li>
</ul>

<p>Am I missing something? Less than 1 dollar per month? Is it because of the specialized mining hardware?</p>
 5406: <p><strong>No you are not missing anything. <a href="https://bitcoin.stackexchange.com/q/59/5406">CPU mining has been unprofitable since 2011</a>, <a href="https://bitcoin.stackexchange.com/q/5608/5406">GPU mining just slightly later</a>.</strong> </p>

<p>Today, <a href="https://bitcoin.stackexchange.com/a/12042/5406">ASICs</a> rule mining. The Bitcoin network has more than <a href="https://blockchain.info/charts/hash-rate" rel="nofollow noreferrer">300 Phash/s</a> by now, that is 300,000,000,000 Mhash/s.</p>

<p>The upcoming ASIC miner generation is <a href="https://en.bitcoin.it/wiki/Mining_hardware_comparison" rel="nofollow noreferrer">announced to provide more than 9,000 Mhash/s per Dollar</a>. Times for GPU/CPU mining are long gone.</p>

<p>The situation is largely the same for Litecoin with a slight delay.</p>

<p>Also see: <a href="https://bitcoin.stackexchange.com/q/2154/5406">Why does mining profitability tend towards zero?</a></p>

<p>There might be some altcoins that can still profitably CPU/GPU mined and traded for Bitcoin thereafter, but I am not sure even they are worth when you factor in time investment.</p>
