I have a computer which I have been using from almost a year now. The processor is an Intel Core i7 920 which is overclock to 4.0 GHz. Processor, video card and motherboard are water cooled. Below is my system specs:
Motherboard: Asus P6T Deluxe V2
Processor: Intel Core i7 920
Memory: 12 GB (6 x 2 GB) G. Skill DDR3-2000 Trident
Storage: 2 x 80GB Intel X25-M (RAID 0) + 2 x 1 TB Samsung Spinpoint F1 (RAID 1)
Video card: HIS ATI Radeon HD 5870
Electricity supply: Corsair HX850W
Operating system: Windows 7 Ultimate (64-bit)
The system was up until a little while ago and has been completely stable with four GHz processor (I can say that because I run Prime95 as long as I wanted, and that it never appeared on any issue that could be related to overclock). But after some time I began to get the blue screen every now and then with error code "0x0000009C: MACHINE_CHECK_EXCEPTION". After a online search I came to the conclusion that this was due to high temperatures, hardware failure or excessive overclocking. Temperatures excluded me immediately, for water cooling can not hold down to a reasonable level. So I try to clock down to the default settings, and then the problem disappeared. As such, the solution is probably simple and straightforward, and I could probably just clockwise down a bit and been well pleased with it. But I'm just a little curious about what it might be that has happened since everything has seemed 100% over such a long time. I try to run Memtest86+ for over 15 hours (8 pass) without any error indication. I can still run Prime95 for several hours without failure, and in daily use as the computer behaves fine. The last time everything has been disrupted have been in the middle of the night, when the computer just sits there. I know that such errors like this here can be almost hopeless to diagnose. So I thought to ask here to know if there is someone who has any input or experiences that could be helpful? One may well say that there has been a small "prestige questions" to get your machine stable at 4 GHz. For the settings I've used all the way to overclock my preview, see here:
BCLK: 200 MHz
Multiplier: 20x
CPU Voltage: 1.375 V
QPI / DRAM Core Voltage: 1.35 V
Intel SpeedStep: OFF
Everything else is on auto (in the moment is DRAM Bus Voltage of 1.56 V and CPU PLL to 1.80 V).
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