How long does it take for a fanless ASIC to overheat in Freezing Temperature?

[paramind22]

I have an ASIC, a humble gridseed orb, that doesn't have a fan, and I am wondering if I can put it in my car on a freezing winter day with a laptop mining at SHA256 mode.
 

Looking for hard science here.   I know it's recommended not to use them in SHA256 without the fan.  How long would it last before it starts burning up the car?  I know I could do it just with the laptop battery. 

Curious if there is a formula for any ASIC without fans working in freezing temperature.  This has probably been thought of before.  What is the chip temperature per variable times load minus external constant freezing temperature..... 

[philipma1957]

I have an ASIC, a humble gridseed orb, that doesn't have a fan, and I am wondering if I can put it in my car on a freezing winter day with a laptop mining at SHA256 mode.
 

Looking for hard science here.   I know it's recommended not to use them in SHA256 without the fan.  How long would it last before it starts burning up the car?  I know I could do it just with the laptop battery.  

Curious if there is a formula for any ASIC without fans working in freezing temperature.  This has probably been thought of before.  What is the chip temperature per variable times load minus external constant freezing temperature.....  

death under 5 minutes.

no heatsink = over heating 

also gridded orbs  like to mine ltc and scrypt   not sha256  this is a power/overheating issue as sha 256 pulls 5x the power of scrypt

[QuentinA]

scrypt only with no fan isn't a problem at all, even on a warm day, sha uses way more power so it's debatable (from experience)

[Dabs]

Get a box fan and aim it at the gridseed orb. I had a dozen of those a few years ago.

[isoneguy]

I have an ASIC, a humble gridseed orb, that doesn't have a fan, and I am wondering if I can put it in my car on a freezing winter day with a laptop mining at SHA256 mode.
 

Looking for hard science here.   I know it's recommended not to use them in SHA256 without the fan.  How long would it last before it starts burning up the car?  I know I could do it just with the laptop battery. 

Curious if there is a formula for any ASIC without fans working in freezing temperature.  This has probably been thought of before.  What is the chip temperature per variable times load minus external constant freezing temperature..... 

You don't need a fan, but without moving air your heat dissipation will not be as great.

I can't speak for any specific asic, but when I tested microchips for phones/computers we stress tested them down to -40 C

One thing you have to realize is that with extreme temperatures your chips will behave differently. Some chips operate better in cold than others.

I would suggest down-clocking it and raising the clocks until you find something that it will run stable with.