You do know anything below ambient is going to be hard, what about phase change cooling?
If you are a noob, why the hell are you fiddling with liquid nitrogen and big watercooling?
I've not gone beyond water yet either, so take the following with a pinch of salt.
Phase is the most common approach. I believe it is generally a converted air con unit or home made, whether at your home or someone else's. XS would probably the be place to look for this. A thread to the effect of "I'm a noob what wants phase!" may be ripped to pieces, so researching this before asking would be wise. I believe you're looking at the best part of a grand to get someone to build it for you, it'll cool the cpu only and condensation will be a worry.
Next up is chilled water. You pump the water through a chiller of some description, this chills everything attached to the loop. Condensation is if anything a bigger issue since everything is cold, and the processor will be warmer than under phase. Thermoelectrics have potential for this, as you can fit a lot of cooling capacity in a small volume. Your electricity bill would not thank you.
Liquid nitrogen obviously works rather well, but has no realistic 24/7 application so I've mostly ignored it.
You need to assign a budget, work out how you'll deal with condensation, and come up with a good enough reason to bother with all this.
edit: I'm very gradually coming up with a plan for a tec chiller, suspect I'll be looking at about £200 for the construction.
as in i have never done anything which is the step past liquid cooling
I don't know why the chillers you're looking at are all incapable of dropping below 4 degrees. That makes little sense to me; the only exciting thing that happens at 4 degrees is liquid water starts to expand instead of contract as it cools further.
Your coolant is currently a couple of degrees above ambient, probably 5 degrees over ambient (25 ish). If this is enough, then obviously sub ambient isn't what you want. Otherwise the 25 degree drop to a bit above zero is considerable. A very good phase system will maintain a i7 chip at -102 degrees load (based upon anand running such a system). I'm under the impression that these are almost all made for the purpose, and not available off the shelf.
I don't think many people run phase on graphics cards, even relative to how many run sub ambient. I've seen a few online with phase on the cpu and chilled water on the rest.
An important question is whether or not you are able to assemble such a mechanism yourself. I don't know enough about refrigeration to assemble phase, but should be able to cope with tec eventually.
What system are you looking to setup and what overclock are you after for 24/7?
That would do it. You're looking at aquarium chillers. They don't want the water to go below 4 degrees because they're not keen on freezing the water with fish in. Since you want to cool a computer loop below zero, you're clearly not going to be using water.
Over 5ghz is rarely achieved for prolonged time periods. 5ghz can be hit 24/7, but you'll need a good motherboard and a good processor to achieve this, as well as considerable skill. There are benchmarks of an i9 at 6ghz+, but I will be astonished if the six core chips beat 5ghz stable. The chip would draw too much current.
That would do it. You're looking at aquarium chillers. They don't want the water to go below 4 degrees because they're not keen on freezing the water with fish in. Since you want to cool a computer loop below zero, you're clearly not going to be using water.
Over 5ghz is rarely achieved for prolonged time periods. 5ghz can be hit 24/7, but you'll need a good motherboard and a good processor to achieve this, as well as considerable skill. There are benchmarks of an i9 at 6ghz+, but I will be astonished if the six core chips beat 5ghz stable. The chip would draw too much current.