user4543: I have 4 video cards: 2x 7970 & 2x 6970.
This is a question of efficiency regarding MH/s. Simply, I would like to know which is better:

~1900 MH/s on one machine 
~1200 MH/s and ~700 MH/s on respective machines
It does not matter

Could the answer please include efficiency for both solo mining and pool mining?

user2306: 
This is a question of efficiency regarding MH/s. Simply, I would like to know which is better

It doesn't matter. Every hash has an equal probability of finding a block. However, that being said, there's some hidden teeth:

Putting graphics cards together will make them harder to cool.
Putting them in multiple computers will use more electricity - all computers use some electricity, even at idle.


Could the answer please include efficiency for both solo mining and pool mining?

My advice applies for both.

4543: <p>I have 4 video cards: <strong>2x 7970</strong> &amp; <strong>2x 6970</strong>.</p>

<p>This is a question of efficiency regarding MH/s. Simply, I would like to know which is better:</p>

<ol>
<li>~1900 MH/s on one machine </li>
<li>~1200 MH/s and ~700 MH/s on respective machines</li>
<li>It does not matter</li>
</ol>

<p>Could the answer please include efficiency for both solo mining and pool mining?</p>
 2306: <blockquote>
  <p>This is a question of efficiency regarding MH/s. Simply, I would like to know which is better</p>
</blockquote>

<p>It doesn't matter. Every hash has an equal probability of finding a block. However, that being said, there's some hidden teeth:</p>

<ul>
<li>Putting graphics cards together will make them harder to cool.</li>
<li>Putting them in multiple computers will use more electricity - all computers use some electricity, even at idle.</li>
</ul>

<blockquote>
  <p>Could the answer please include efficiency for both solo mining and pool mining?</p>
</blockquote>

<p>My advice applies for both.</p>
