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FX-8150 jumps to 255 degrees celsius?

Last response: in Overclocking
May 9, 2012 10:49:51 PM

Hey Guys heres my problem, when I run prime95 test or Linx, the test goes well for 10 minutes or so. Then all of a sudden my temperature readings for programs like CPU-HW or AMD overdrive jumps to 255 degrees celsius. My computer doesnt explode or anything though, and the test is still running. The 255 Degrees slowly drops down to around 100 degrees or so then jumps back up to 255. What I have noticed is that when it jumps to 255 degrees my CPU clock goes from 4.3GHZ to 1.5GHZ at 7x multiplier. As it drops down to 100 degrees the multiplier returns to normal and the cycle repeats itself until the stress test application is closed. Is there something wrong with my CPU? The temperatures are wrong but why does it decrease my multiplier and everything?

P.S. Prime95 or LinX has shown no errors when this occurs.

Oh yeah, here is my system specs:

FX-8150 Using H100 Cooler
8GB of ram (667mhz each)
Corsair 800w PSU
Mobo: MSI 970A-G46
May 9, 2012 11:04:31 PM

Well in these temperatures, I doubt you would here posting anything. I'm no pro, but exactly 255 suggests it's software problem.
a b à CPUs
May 10, 2012 12:55:00 AM

No cpu would survive 255c. That's 671 degrees fahrenheit (for us F people)! Most likely an error, like Vatqafaks mentioned.
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a c 105 à CPUs
a c 84 K Overclocking
May 10, 2012 1:28:50 AM

Definately an error in temp reporting but it's also thermal throttling it seems so something is strange there. I would be inclined to apply new thermal paste and reseat the waterblock as a first course of action. Are you sure the pump is working on the H100 and do you have it set to at least med (high would be best when running stress tests).
May 10, 2012 7:45:12 AM

This only occurs when I stress test, the readings of the temperatures seem farely accurate during idle (20 degrees celsius). My guessing is that my CPU thinks its too hot which indicates the 255 degrees celsius and changes the voltage, multiplier and such to prevent any damages while hoping to lower the temperature. Is there anyways to fix this because during stress testing, I dont want my multipliers to change or it will provide an inaccurate result.
a c 79 à CPUs
a b K Overclocking
May 10, 2012 8:07:58 AM

the only things you could try would be to update the motherboard BIOS and try re-seating the cpu in the socket making sure no pins are damaged, or covered in thermal paste as i have seen before.
a c 138 à CPUs
a c 239 K Overclocking
May 10, 2012 8:22:27 AM

if if 255C is realistic ... wow fantastic :D  ( u can boil egg for fast) and yeah agree with other , that is bug soft / driver
May 14, 2012 1:54:51 AM

As stated before exactly 255 degrees suggest a data error.

255 is the old 8 bit number (binary, 11111111) and I would guess, like Link in the old Nintendo "Legend of Zelda" couldn't get any richer than 255 rupees, your processor can't get any hotter than 255 degrees.

Switch over to Fahrenheit and that might cool it off? :pt1cable: 
a b à CPUs
a b K Overclocking
May 14, 2012 4:16:15 AM

Go to Windows power profiles and put it on high performance to keep the CPU from throttling....As far as the temps they are a product of buggy software or you may need to update your BIOS to remedy your sensor problem on the temps
July 24, 2012 6:33:04 PM

I am having the same problem with my FX-8150, did you find a fix to this?
a b à CPUs
a b K Overclocking
July 25, 2012 12:44:18 AM

@WhyCleanIt--->Its a sensor problem ....You can sometimes flash your BIOS to a newer version and it will fix it
July 26, 2012 3:17:08 PM

Thanks lowjack