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So I was wondering what was better, a 60mm radiator with push, or a less than 55mm radiator with push pull? My 420 rad doesn't fit in the top of my case with push pull <img alt="frown.gif" class="bbcode_smiley" src="http://files.overclock.net/images/smilies/frown.gif"><br><br>
Also the 5mm slimmer rad has a fun density of 20 while the other one a density of 10
 

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Too many variables to say for certain. In general, other things being equal:<br><ul class="bbcode_list"><li>Push/pull is better than either push or pull</li>
<li>Pull is better at lower fan speeds (below about 1100-1300ish RPM, depending on the fan), while push is better above that</li>
<li>Thicker rads tend to be better than thinner rads and benefit a lot from higher static pressure fans</li>
<li>Higher FPI rads tend to have higher performance, but need higher RPM and static pressure fans to see that benefit</li>
</ul><br>
Basically, without knowing what your rads or fans or fan speed preference are, there's no way of giving specific answers.
 

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Slim + Push/Pull is pretty much a sure win over thick and just push or pull.<br><br>
Best to worst radiator difference is only 17% with many slim rads that are tuned and near the top. The Alphacool ST30 for example is stronger performing than it's UT60 brother at very slow fan speeds. The MCR320 XP is also a slim that performs exceptionally strong at 2000+RPM fans.<br><br>
Push + Pull fans will typically net about 30% gains so it's a sure thing that slim plus push/pull will be better than just about any thick rad with push or pull only.<img alt="thumb.gif" class="bbcode_smiley" src="http://files.overclock.net/images/smilies/thumb.gif"><br><br>
The bigger advantage of premium thick rads is they can be tuned to be better all around performers and since they have double the tubes, they have about half the restriction. Many also have an above average build quality and they look good too.<br><br>
Just don't expect 100% gains over double thickness, it is actually closer to 10-15%, but that's not always either.<br><br><br>
Don't get too wrapped up in fin density. Generally the more dense will do better with higher speed fans, but that isn't always true either since there are different fin types. I've seen the opposite in too many examples now to really depend on FPI to be much of a guide. The slimmer the rad the less restriction through the fins as well, so it's a number of variables.
 
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