H60, Push vs Pull default instruc. Pull?

From what I've read it seems that push is better than pulling in respect to fan placement but all of the install videos I've seen using 1 fan seem to have the fan pulling air with the radiator inside and the fan outside adjacent to the outer case. Why is this? Am I missing something?

Either way you look at it, the fan is pulling from one side and pushing it on the other.
A Push Pull Config is with 2 fans, never with a single fan.
Air on the outside of the case is cooler than the air on the inside of the case thus the Air is pulled into the case and the Radiator is placed behind it allowing cool air to flow over the cooling fins of the rad.
The pic you saw with the Fan outside the case must have been because the pipes of the H60 are not detachable thus the user must have not had the idea of mounting the Fan and the rad inside the case pulling air in, or then , he might not have had enough space to mount both of them within the case because of a NB heatsink.

For most medium or lower speeds, pull works better...but it's only a slight margin. Differences are typically environmental when using the same fans in push or pull. Push/pull with low/med speed fans can get close to push OR pull with higher speed fans in some instances (depending on rad model and fans in question).

Your hardware is often one of the biggest limitations: your motherboard might not be able to control voltages well enough to remain stable, your RAM/speed/voltage might not be up to par for the stepping or speeds you want to use or your PSU may not be able to deliver power that is clean or stable enough for your MB...which might starts the cycle over. Between hardware limitations, BIOS setting limitations and user error you have 95% of the reasons hardware doesn't OC like you intend. Temps really account for very little cause for overclocking failure.

Just to go back to the original question, IMO I'd try to go with pull, and put a shroud around it. You could probably even just use black electrical tape - the point is to force the fan to suck the air through the rad and not let it get air in from the small gaps between the rad and the fan. It should have a pretty uniform air movement through the rad this way (in theory). I just did some work on my loop and when I took off my fans (they were in push) I could see a ring of dust with a dead clean center, so obviously it's not the most optimal cooling to have just push.

@bhilly82
When using the Corsairs for pulling air into the case we usually have a case with a top exhaust fan. That makes it more efficient.

@alyoshka, I do have a top fan. I have the Thermltake V9 Black http://www.newegg.com/Product/Prod [...] 811133074.
I couldn't use the side fan but the top fan is exhausting the air out the top, and my gpu temps did go up with the fresh air from the back. I do have a heat pump of a graphics card.

Ram timing and speeds affect the overclock in the sense that if it's tied into the FSB, then you'll need to choose an FSB that can allow the RAM to run at it's rated speed. You can OC RAM, but let's say you go from 1600mhz to 1800mhz, then that would require an increase in the timings as well (such as from 8-8-8-24 to 9-9-9-27). As far as performance go, RAM is one of the least performance affecting pieces of hardware. Yes, it can help to have faster RAM but it's not going to really matter compared to the CPU OC and having an SSD and fast GPU.

As for burning out the CPU, yes you can even at 1.45V. Technically. I don't know as much about AMD OCing so maybe they handle a little more voltage, but I do know that over 1.4V on Intel CPUs can burn them out in a few months. I think I just read about it too in one of Tom's more recent articles although I can't recall which one.