- Oct 30, 2008
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Hey guys!
I keep my E8400 @ 4ghz at a comfortable vcore (more on that just ahead). The thing is, this OC has always been gaming stable, but not stress testing stable.
I never managed to passe 1 hour of Prime95 blend test or OCCT. It always fails somewhere between 30 and 40 mins into the tests. But because it it is gaming stable, I never really bothered to tweak it further.
It has, however, passed the prime95 FPU stress test for about 9 hours. I then stopped it. So, this brings me to the fact that the CPU itself might be stable and I absolutely don't want to go any higher on the Vcore. Si i'm guessing the culprit of instability is some of the mobo's other volts. Posssibly NB or even VTT:
Here are my BIOS volts, and here's where I need some help:
What are the safe values for EACH of these voltages, and how far would you go with each one to try and achieve a fully stable OC? Please remember that I'm thinking about a long term OC. Which means that I plan to keep this mobo/CPu for at least another 18 months.
So, here goes:
CPU vcore: 1.437v in BIOS (CPU-Z reads 1.408v idle, 1.392v full load. I also have LLC disabled so, i'm comfortable within this range. Remember: I'm not willing to up the vcore anywhere from this point. Even though my temps are very good, I don't want it because this is a long term OC)
NB voltage: 1.3v
RAM: 2.3v (I know this is a little high, but my Kingston HyperX kit comes rated @ 2.3v for 5-5-5-15 @ 1066mhz. Plus the RAM comes with big heatsinks, and I also have a giant fan blowing over the memory and the NB.)
CPU PLL: 1.60v (1.50 is the stock value. I also read that this is the most dangerous voltage you can mess with.)
FSB termination voltage (P5Q Pro's equivalent of VTT): 1.32v
CPU GTL Reference: 0.63x. This voltage has 3 value settings besides AUTO: 0.61x; 0.63x and 0.65x. I'm clueless about this voltage, so I just left it at the "middle" setting.
So... which of these volts can I safely increase to try a fully stable OC? Besides CPU vcore.
I guess this covers the main voltages and values on my motherboard.
My current OC is completely gaming stable, but not stress testing stable. While I'm happy with it, I decided I wanted a bit of peace of mind and go for a 100% stable OC.
Any help would be greatly appreciated.
Cheers!
I keep my E8400 @ 4ghz at a comfortable vcore (more on that just ahead). The thing is, this OC has always been gaming stable, but not stress testing stable.
I never managed to passe 1 hour of Prime95 blend test or OCCT. It always fails somewhere between 30 and 40 mins into the tests. But because it it is gaming stable, I never really bothered to tweak it further.
It has, however, passed the prime95 FPU stress test for about 9 hours. I then stopped it. So, this brings me to the fact that the CPU itself might be stable and I absolutely don't want to go any higher on the Vcore. Si i'm guessing the culprit of instability is some of the mobo's other volts. Posssibly NB or even VTT:
Here are my BIOS volts, and here's where I need some help:
What are the safe values for EACH of these voltages, and how far would you go with each one to try and achieve a fully stable OC? Please remember that I'm thinking about a long term OC. Which means that I plan to keep this mobo/CPu for at least another 18 months.
So, here goes:
CPU vcore: 1.437v in BIOS (CPU-Z reads 1.408v idle, 1.392v full load. I also have LLC disabled so, i'm comfortable within this range. Remember: I'm not willing to up the vcore anywhere from this point. Even though my temps are very good, I don't want it because this is a long term OC)
NB voltage: 1.3v
RAM: 2.3v (I know this is a little high, but my Kingston HyperX kit comes rated @ 2.3v for 5-5-5-15 @ 1066mhz. Plus the RAM comes with big heatsinks, and I also have a giant fan blowing over the memory and the NB.)
CPU PLL: 1.60v (1.50 is the stock value. I also read that this is the most dangerous voltage you can mess with.)
FSB termination voltage (P5Q Pro's equivalent of VTT): 1.32v
CPU GTL Reference: 0.63x. This voltage has 3 value settings besides AUTO: 0.61x; 0.63x and 0.65x. I'm clueless about this voltage, so I just left it at the "middle" setting.
So... which of these volts can I safely increase to try a fully stable OC? Besides CPU vcore.
I guess this covers the main voltages and values on my motherboard.
My current OC is completely gaming stable, but not stress testing stable. While I'm happy with it, I decided I wanted a bit of peace of mind and go for a 100% stable OC.
Any help would be greatly appreciated.
Cheers!
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