Prime95 immediate fatal error

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jaymop

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Mar 22, 2014
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Whenever I run Prime95, I immediately get a fatal error for rounding on the main thread and the subsequent four threads within a minute. This happens under both blend and fft tests. My rig is listed below.

I'm running my processor at 4.0 Ghz, my cpu temps don't get above 45 during the test. I tested the RAM using Windows stock test and it was fine for two passes. I ran furmark for 2 hours, no problems, and no more than a 50 c temps. I've been able to play games (Skyrim on high graphics) with no problems, and I have normal functionality with everyday tasks.

I've read that prime95 doesn't make mistakes, and I want to make sure that my system is stable, especially if I plan to OC in the future.

CPU: AMD A10-7850K Black w/ stock cooler
Mobo: ASRock FM2A88M Extreme4+ FM2+
Memory: Mushkin Enhanced Blackline 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 2400
HDD: Seagate Barracuda ST1000DM003 1TB 7200 RPM 64MB Cache SATA

I don't really know what else to do to figure out the error. If I can provide any other information or take diagnostic steps, I'm happy to do so. Thanks in advance.
 
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pauls3743

pauls3743

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Dec 24, 2011
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I think your processor is overheating and you are using tools which are giving duff measurements.
What tools are you using to measure your processor temps? I would recommend coretemp, realtemp or cupid HWMonitor. These measure the core temperature of your processor. Your motherboard/system monitoring software is to be avoided as it can read the processor as up to 20 degrees cooler as it takes the reading from a different location in the processor.
I would also ask what cooler you are using, and what core voltage you are running the processor at.

The purpose of prime95 is to produce as much heat as possible within your processor. It does this by constantly running algorithms and checking them against proven knowns, also programmed into the program. When you overclock your processor it produces more heat, it needs a higher voltage to keep that data correct within the processor. When it isn't, the data gets corrupted (interfered with by other processes also happening within the processor). Hence, prime95 reports errors.
 
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J

jaymop

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Mar 22, 2014
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4,510
@rwinches, thanks for the reminder! I had read that the board and the processor could take up to 2400Mhz RAM and wanted to get as much speed as possible for the graphics, but it looks like that was my problem. I changed the timing to 2133Mhz, and the test runs like a dream. I ran it for 2 hours with no problems and temps holding steady at 64C. Not great, but I can probably get it to drop lower once i set my cpu fan to run at 100% at 60C. Thanks for the links.

@pauls, the processor isn't overheating. I was using HWMonitor, the cooler is stock, I'm not overclocking, and the CPU core voltage ranges between .7 and 1.37 depending on the turbo boost.
 
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