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Windows 7: BSOD 0x124 every 8 hours, sitting or composing text; OK for 6 years!

05 Dec 2013   #11
motorfingers

Windows 7 Ultimate 64-bit (I'm trying out W 10 Pro)
 
 

OK, I found it. I was getting Kernel-Power crashes, with BugcheckCode 0 and all other parameters 0, in spite of efforts to capture the BugcheckCode such as unchecking autorestart in the system setup. Frequency grew slowly until this was a daily occurrence. I decided that this was a power supply problem. The power supply is quite recent, but it has several 12 Volt rails, each rated at 25 Amps (300 Watts), with one rail coming in through the 24-pin connector and another (or possibly two) coming in through the 8-pin CPU connector. Each 12 Volt rail was rated at just 300 Watts, even though the power supply was rated at 850 Watts.

So I got a newer 1000 Watt power supply with nearly all 1000 Watts on a single 12 Volt rail. I installed it and, no boot. I figured that this is always a risk with a new power supply so I put the old one back. No boot. Recheck everything, no boot.

The no-boot condition was identical to what I had been experiencing trying to upgrade the processors from Xeon E5335's to E5450's, although it had always booted back to the E5335's without a problem. I believe that the no-boot condition is caused by age degradation of the buck converters that supply the 1.75 Volt processor voltage from the 12 Volt rails, specifically the capacitors drying up. This gradually worsening condition probably accounts for the BSODs and certainly explains the Kernel-Power crashes. This accounts for the no-boot problem with the E5450's, even though the TDP of both the E5335's and E5450's is 80 Watts. The motherboard dates from December 2007, after all. So I retired the motherboard.

I'm now writing this on an ASUS Sabertooth 990FX R2.0 motherboard with an AMD FX 8350. Clock went from 2 GHz to 4 GHz, but L2 cache went from 2X4 MB twice to 4X2 MB once with 8 MB L3 cache. The E5450's have 2X6 MB each with a 3 GHz clock, so the cache size isn't what it would be with the server processors but the clock is a little better. TDW went from 80 Watts X 2 to 125 Watts.

The PassMarks (a server benchmark that emphasizes the cache) went from 5314 to 9102, but the Xeon E5450's would have been close at 8164, which is why I wanted to go that route. I changed because I was not in a position to tear the computer down to a bare motherboard and start changing capacitors and hope it worked; I need a reliable daily computer that is not a project in itself, and I don't need another project.

May the DSGC-DW RIP. I got a lot out of it in seven years, much of which all eight cores were running at 100% 24/7, and it made the world a better place in a small way that is noted by some very prominent players out there. Other projects are brewing and the new rig is capable and ready to go.


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 BSOD 0x124 every 8 hours, sitting or composing text; OK for 6 years!




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