Quote from: jstefanop on March 01, 2018, 10:54:33 PM

Quote from: Finless on February 27, 2018, 06:39:10 PM

Quote from: lennyNO on February 27, 2018, 12:19:44 PM

Quote from: Finless on February 27, 2018, 01:20:07 AM

Your opinion please on temps.
... I use a heat gun probe tool to measure the small back heat sink and it runs about 153F. Knowing chips a bit 153F is OK.
... BUT the back heat sink runs about 162F. I think this is pushing it no?
Is 162F OK for the back heat sink? What is the max temp on this to be careful of reaching? Back in my old chip days 175F was about it before stuff starts losing a lot of life big time.

Back in the old days people read the instructions first -- see page 1 of this thread:

Quote

Even with a fan built in, you can still overheat your Moonlander at higher frequencies. I do not recommend running these past 800mhz unless you can closely monitor temps (if you have a IR temp gun check the top ASIC heatsink, it should not be any hotter than 80C).

Everyone using these beyond 800Mhz uses external cooling (fans). 162F = 72C which is getting borderline, 153F = 67C is really hot. I am running at around 35C = 95F.

My bad... I missed this one line. And yes I have read page one many times. I just missed the one single line on the temp subject.

"if you have a IR temp gun check the top ASIC heatsink, it should not be any hotter than 80C"

That is 176F and I am far below it at 153F. To me this seems OK then? Even at 832 clock and 163F this is still well below 176F.

So why do I need another fan? I cannot go above 832 clock as I get too many hardware errors (over 10%) on these even cranking up the core voltage.

Bob

80C at the top of the small heatsink translates to about 90C chip core temp. I would not go above this for prolonged periods of time, but anything below 80C is actually quiet cool for an ASIC (especially for scrypt ASICs, since they don't have a very large compute die). I would not worry unless you reading temps past 80C.

The main issue with heat is actually more stress on the mosfets, since these chips scale very badly with heat (current draw reaches exponential curve as the chip temp goes up). Your most likely to fry the mosfets/cause a overheat buck shutdown than kill the asic.

Thanks, this is what I thought and why I asked.

Bob