Hi, I just built a new computer, and to get some more performance, I overclocked it. It went to 4 ghz easily, (with voltage auto-defined by the bios--around 1.4). I ran a prime95 stress test, and it stabilized around 77C (although I didn't run it for very long-I wanted to make sure it was safe) My question is: What is the safe upper limit of temperature for the i7 930 in terms of long term (ie 4-6 years)? It runs at 37C when idle. Thanks in advance!
i7 930 @4ghz
6gb Corsair Dominator DDR3 @2000 mhz
Noctua NH-D14 CPU Cooler
Samsung xl2370 monitor
Cooler Master HAF 932 case
2 MSI CD Drives
OCZ Vertex 2 60gb boot drive
300gb WD Velociraptor drive
950w PC Power and Cooling PSU
Also, hyperthreading is enabled... What are the pros/cons of this?
Really, you'll want to keep your CPU temperatures below 75°C, best if below 60°C, although 1.4V seems a bit high on an i7 930 D0, higher voltages tend to degrade the life of the chip a bit more than heat does, so you might want to bring that down a bit. It should last for four to six years though. Just to note, the absolute max is 100°C, although you do not want any of your cores near that.
Hyper-Threading is a technology which produces extra threads which are recognised as cores in Windows, so you have eight 'cores' in Windows when this is enabled. It generally helps out with programs which are designed to use it, however, it does increase temperatures significantly. If you aren't going to use HT, then you should turn it off.
While running Prime95:
At 3.3 ghz 1.2 volts it seems to stabilize in the 50s
At 3.5 ghz 1.24 volts it seems to stabilize at around 59 or 60.
At 4 it seems to stabilize aroud 77.
I guess the 3.5ghz would be the best setting for performance without damaging the processor, right?
Usually, there is kind of a wall that you'll hit... and then a sweet spot that you can find. It will require a larger chunk of voltage to stay stable past a certain point. If 4.0 is only stable at 1.4v, try 3.8GHz or something. You may be able to reach it at relatively low voltages, and therefor, low temps =].
For example, using intervals of 200MHz (or 0.2GHz) all the way up to 4.0GHz, my chip needed minimal voltage increases. Past 4.0GHz, it gets really power hungry and needs a much larger increase to hit 4.2GHz.
Auto will err on the side of overvolting, you may want to check out a few OCing guides to get familiar with the Bios settings. You should be able to reach your goal with about 1.3v and your temps will follow.
Jorge, the reason I suggested the OCing guides is because the only way you are going to know if you have the best OC for your system is to balance a lot of voltages. As an example: the vcore and QPI/VTT both work to get a higher Bclk, you can raise the VTT and lower the vcore (usually) to stay at a certain level or raise the Bclk more. There are many things like this that just take a little time to learn and really help.
As you stand now, 65c max, yep your in good shape. I would still try to look into the guides though.