Two words: Grey Mole. If you can get in contact with him (haven't seen him on XS in a while). IMO he is one of the best, if not the best, phase and cascade builders out there. When i was seriously considering an SS or 2 stage, i talked with him a ton. Great guy, even better builder. He tunes his units better than Sdumper and RunMC, and he sells them for cheaper, with a 1 year warranty i must add. He works in HVACR for a living, so he builds his units for fun. He sells the so cheap because he likes building them for the fun of it, not for the money.
 
His work speaks for himself too if you look through his stuff. (all threads started by him on XS; some phase stuff in there:http://www.xtremesystems.org/forums/search.php?searchid=22381987). Many of his builds seem to use 3/4hp compressors and are tuned for -4x* to -5x*C at 300-350w. He also has been able to tune for 500w at -25*C on one build of his i saw. Also for fun he was able to get an SS he made with a 1/2hp compressor to run -100*C (unloaded, but still, pretty sick).
 
Halo, if you build, a 3/4hp compressor or more would be what you should get. Also, if you want -40*C at 300w, be prepared for tuning alot and mixing gases. There is a ton that goes into building and tuning (and really tuning, not just using huge parts to get the temps you want)...
 
 
 
Or you could just go to ln2 and make things alot simpler.

Hehe LN2 is very unlikely for me.

grey mole fell off the playing field yet again. i was going to grab a cascade from him at one time. he definitely knows a thing or two, but is hardly around anymore. more than likely his health and family matters. he can build a phase change out of just about anything that can produce sub zero temps though..lol
 
flip side though...allot of bad press going on with grey mole as well. it's why i didnt get the cascade from him. it's a bit more in depth, but im not going into it.
i got this with R290/R507A -79C, but then unloaded is temp game as well..

 
side note:
just pick this one up. you can get your feet wet...then take it and transform it into something else or the first stage of a cascade...that way...you will have an idea of what your up against.
adding ports
switching the evap
recharging
changing the condesor
learning the wiring
and so on.
  http://forums.evga.com/tm.aspx?m=915476&high=phase
 
i was thinking of using it as a gpu cooler.

i read up on some of the supposed issues people had with him. Didn't seem like that big of a deal to be honest; more like miscommunication but the other sides were being stupid about it. To me most of his problems seemed to stem from the other people involved, and not so much him. Also, he replied in those threads many times at XS to try and amend any problems that had gone on. Maybe you know more than me though about the issues?

johnksss

just pick this one up. you can get your feet wet...then take it and transform it into something else or the first stage of a cascade...that way...you will have an idea of what your up against.
adding ports
switching the evap
recharging
changing the condesor
learning the wiring
and so on.
http://forums.evga.com/tm.aspx?m=915476&high=phase

i was thinking of using it as a gpu cooler.

Does it look kosher to you?  I see wires dangling and a circuit board laying on the counter.  Also, he thinks it is only tuned to 200W load.  I am pretty sure my 965 will give it a hard time; but it certainly would be a start.
 
I actually have a refrigeration certificate so I can buy refrigerant, but having a certificate doesn't mean I know what I am doing.  The knowledge part takes time and practice.

ty_ger07

I actually have a refrigeration certificate so I can buy refrigerant, but having a certificate doesn't mean I know what I am doing.  The knowledge part takes time and practice.

 
How hard is it to get that certificate? I'll probably want to think about that.

Halo_003

ty_ger07

I actually have a refrigeration certificate so I can buy refrigerant, but having a certificate doesn't mean I know what I am doing.  The knowledge part takes time and practice.

How hard is it to get that certificate? I'll probably want to think about that.

For me, it was just a Saturday morning.  It may vary from state to state though.  The instructor talked for about 4 hours about various theory stuff and regulations, we took a test, and paid a fee, and that was it.

Oh nice I'll look into that then.

ty_ger07

johnksss

just pick this one up. you can get your feet wet...then take it and transform it into something else or the first stage of a cascade...that way...you will have an idea of what your up against.
adding ports
switching the evap
recharging
changing the condesor
learning the wiring
and so on.
http://forums.evga.com/tm.aspx?m=915476&high=phase

i was thinking of using it as a gpu cooler.

Does it look kosher to you?  I see wires dangling and a circuit board laying on the counter.  Also, he thinks it is only tuned to 200W load.  I am pretty sure my 965 will give it a hard time; but it certainly would be a start.

I actually have a refrigeration certificate so I can buy refrigerant, but having a certificate doesn't mean I know what I am doing.  The knowledge part takes time and practice.

if  didnt have compressors laying around, i would have grabbed it already. because it's a starting ground. works as is an can be upgraded when one has money/time and parts.. not sure about the hold down though. give the guy a pm and ask a few questions.

xxrabid93

i read up on some of the supposed issues people had with him. Didn't seem like that big of a deal to be honest; more like miscommunication but the other sides were being stupid about it. To me most of his problems seemed to stem from the other people involved, and not so much him. Also, he replied in those threads many times at XS to try and amend any problems that had gone on. Maybe you know more than me though about the issues?

1 to 2 years later is a bit late my young friend. here let me sell you my 980x and think about giving it to you a year later..i dont think you would be very happy about that. besides..i talked to him directly so i pretty much know what was going on at the time. told you..i was gonna get a cascade from him. i just didnt go in to detail as to what happen.

Hey guys. Check this: http://forums.evga.com/tm.aspx?high=&m=991177&mpage=1#991197