You simply replace X with the number of the field.
You will have to scroll across here to see what words I used, for example Mobo, CPU, GFX etc. Just make sure the fields tie up with each other.
Here is my postbit_legacy for this mod.
Code:
<!-- post specs_menu -->
<div class="vbmenu_popup" id="specs_$post[postid]_menu" style="display:none">
<table cellpadding="4" cellspacing="1" border="0">
<if condition="$post['field6']">
<tr><td class="vbmenu_option"><b><font color=#00FF00>Mobo:</b></font> $post[field6]</td></tr>
</if>
<if condition="$post['field7']">
<tr><td class="vbmenu_option"><b><font color=#FF9900>CPU:</b></font> $post[field7]</td></tr>
</if>
<if condition="$post['field12']">
<tr><td class="vbmenu_option"><b><font color=#00FF00>GFX:</b></font> $post[field12]</td></tr>
</if>
<if condition="$post['field8']">
<tr><td class="vbmenu_option"><b><font color=#FF9900>RAM:</b></font> $post[field8]</td></tr>
</if>
<if condition="$post['field9']">
<tr><td class="vbmenu_option"><b><font color=#00FF00>Sound:</b></font> $post[field9]</td></tr>
</if>
<if condition="$post['field10']">
<tr><td class="vbmenu_option"><b><font color=#FF9900>PSU:</b></font> $post[field10]</td></tr>
</if>
<if condition="$post['field11']">
<tr><td class="vbmenu_option"><b><font color=#00FF00>O/S:</b></font> $post[field11]</td></tr>
</if>
</table>
</div>
<!-- / post specs_menu -->