System Profiler lists 4 cores w/ HT ON in i7 machine

[Narayana]

Hello-

 

I recently built a new machine and was trying to overclock earlier today. I noticed that my machine was able to run stably at stock CPU Voltage @ 3.8GHz. I tried to lower the Voltage to 1.2V in the hopes of reducing load temperatures and my system Kernel Panicked while running a stress test. After increasing the voltage to nominal, I noticed that System Profiler and Temperature Monitor now list the number of cores as 4 regardless of whether or not Hyperthreading is on. I have reset the motherboard and the problem persists.

 

Interestingly, despite reporting 4 cores, it is apparent that HT is enabled by these quick benchmarks (post mobo reset):

 

Default (2.66GHz/1066MHz RAM/HT ON):

Geekbench: 8357 (8 threads listed)

XBench: 290

 

Default (2.66GHz/1066MHz RAM/HT OFF):

Geekbench: 6679 (4 threads listed)

XBench: 287.36

 

Overclocked (3.8GHz/1520MHz RAM/ HT ON):

Geekbench: 11408 (8 threads listed)

XBench: 389.41

 

Overclocked (3.8GHz//1520MHz RAM/ HT OFF):

Geekbench: 9274 (4 threads listed)

XBench: 397.18

 

mprime also seems to report the correct number of cores whether or not HT is enabled; Temperature Monitor does not.

 

Does anyone have any ideas on why this might be? Are people running their overclcoked i7 machines with CPU voltages less than 1.25625V?

 

I assume this is a cosmetic thing (I will play with other applications later), but does anyone know how I can fix it?

 

Thank you.

[Narayana]

Nevermind, I don't actually think that there is anything wrong.

 

I noticed the problem initially when temperature monitor was only displaying the temps for 4 cores. I then went to System Profiler and saw it listed 4 cores, and was worried the OS wasn't properly sensing that HT was on.

 

In reality, System Profiler always list the physical cores while the options in temperature monitor somehow changed to only show 4 of 8 cores.

 

I would delete the thread if I knew how (mostly to avoid any embarrassment... ).

 

Back to overclocking...I seem to be able to get the machine into a stable state where mprime will run all night at acceptable temperatures to me (70-74C), but it won't wake from sleep.

[broken]

Back to overclocking...I seem to be able to get the machine into a stable state where mprime will run all night at acceptable temperatures to me (70-74C), but it won't wake from sleep.

 

Does you machine wake from sleep correctly if it isn't OC'ed?

 

Cause many folks have wake from sleep issues regardless of overclocking or not.

[Narayana]

Does you machine wake from sleep correctly if it isn't OC'ed?

 

Cause many folks have wake from sleep issues regardless of overclocking or not.

 

 

Yes, sleep works properly at default settings. I read a thread suggesting it might have something to do with the RAM. I have since clocked the ram from 1080 to 1600MHz, but have only sucessfully slept with the following settings:

 

BCLK: 180

X_CPU: 20 (3.6GHz)

V_CPU: 1.28125V

X_MEM: 6 (1080MHz)

V_MEM: 1.6V

 

Where X is multiplier, V is Voltage.

 

I would revert back to this and raise the multiplier to 21 to nearly reach my arbitrary target of 3.8GHz, but my motherboard's BIOS (GA-EX58-UD4P F7) won't allow me to do so. Gigabyte's flashing utility doesn't seem to like the flash drive I tried to use to flash to F8 (where I assume X_CPU of 21 is unlocked).

 

I am fairly certain I have a 920 D0, though there is no such marking on my packaging.

 

EDIT: I was able to resolve the sleep issue by updating to the newest BIOS (F10D). I was having trouble updating before, but I believe Gigabyte's QFlash utility doesn't dig it when you plug the flash drive into the front USB panels. Maybe that will help someone later and this thread won't be considered a complete failure