Actually, if you have some fresh air coming in the nitrogen wont cause any problems. The atmosphere is already almost 80% nitrogen so a 25L dewer of nitrogen wont exactly overwhelm a room unless its a tiny-ass room.
Yes, the fast pot will get down to temp better but while benching it swings like a mofo while running tests. He might as well use the heavy base due to it being the most stable for temps and wont have to add as much ln2 so often.
I also suggested to not completely fill the pot as to not allow excessive amounts of cold to travel throughout the board. While the CPU wont CB, the NB can and if the entire board isn't insulated properly he can run into problems fast.
Also, if he's going to be benching multiple chips in succession it would be best for him to not use anything in the stocket. its easier to just hit it with a blowdryer after benching.
I would invest in a blowtorch if I were you to heat up the pot after you finish. It also comes in handy if you ever plan on benching intel.
You know those 1litre containers doctors use for warts? ( that's the same as your regular flask )They aren't allowed to carry them in cars because if it was knocked over it would spill about 696 liters of gas into your car and night night.
If you knocked over a 40 liter Dewar that would be about 28,000 liters of gas or 28 cubic meters. How much oxygen would that displace in your room?
If you don't have a fresh air supply you can easily get the "bends" even tho you are using tiny amounts.
Ln2 is not a toy despite how much fun it is, don't treat it like one.
Now please stop trying to kill our benchers, it won't help you win forum wars
@maximous; You shouldn't have any problems booting up cold unless you are very unlucky and have a coldbugged IMC but it's not a common thing. You can even pull the pot down to temp before starting up if you feel like it lol.
You can use a bit of thermal paste to keep the probe in place and ensure good contact