Build:
Asus Crosshair V Formula Z
Kingston HyperX DDR3 @ 2133 MHz
AMD FX-6300 Vishera six-core
BFG Tech GeForce 7950 GTOC
Thermaltake Smart-M Series 850-watt PSU (Purchased in July 2012)
WinXP SP-3 (no updates installed yet)
I just put this system together on Friday, and after getting an invalid product key for Windows 8 from Newegg.com, I decided to install WinXP with a slipstream SP3 disc. Everything works nicely except for the periodic reboots. I disabled "Automatically Restart" in the advanced system settings so I could get a blue screen, but I get no blue screen... just a sudden reboot.
Now here's what happened. The memory I'm using (Kingston HyperX 4GB x 2 - KHX2133C11D3K4) is listed in the QVL and is in the manual that came with the motherboard.
I had the BIOS set to run the memory at 2133MHz, timing was 11-12-11-30 as per the book and QVL, and I had the voltage set to 1.65v. After the spontaneous reboot, I went back into the BIOS and noticed that all my memory timings and frequency had been set back to the defaults I remember seeing when I first turned the computer on (1333MHz and 9-9-9-24). And the voltage had been lowered to 1.60v, which is still higher than the 1.38v or so that was the default.
I'm wondering what the BIOS is doing here. Is it running some kind of analysis and lowering the voltage on my behalf? The book specifically lists the voltage when running four DIMMS. I have four DIMMS, but I only have two installed because the book said I should get a premium memory cooler if I want to run a full memory load. I can't get a memory cooler right now because I spent all the money I had to spend getting the other hardware and Windows 8. Should I change the voltage to something else with only two of the four DIMMs installed? Or maybe I should go ahead and stick the other two DIMMs in and see if that works? I've never had a memory cooler before, but I've also never built a computer with all four DIMM slots filled. I'm not sure how to proceed.
So I'm wondering if these BIOS settings are possibly causing my reboots. Since I can't get a blue screen for an error code, for now, this is the only thing I can think of that could be causing problems. When the BIOS was set to the defaults, spontaneous reboots happened far more quickly, like within ten seconds of trying to install Windows 8. (By the time I got to installing WinXP, I had configured the frequency, timing and voltage for the memory so I didn't have a reboot problem.)
What suggestions do you guys have at this point for stopping the reboots and/or what explanations do you have for these strange changes to the BIOS?
Thanks,
Fluidstream
Motherboard: Asus Crosshair V Formula Z (BIOS 1101)
CPU: AMD FX-6300 Vishera 6-Core
Memory: 16 (4 x 4) GB Kingston HyperX 2133 @ 1333 - DDRKHX2133C11D3K4/16GX
Graphics: MSI GeForce GTX 650 (OC Edition) w/ 1GB GDDR5
Display: Acer S271HL 27" LCD-LED @ 1920 x 1080
Hard Drive: Western Digital Caviar 320GB
PSU: Thermaltake Smart-M Series 850-watt (July 2012)
UPS: APC XS 1500