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post #6411 of 10697
Getting 4.9GHz stable was a breeze. Getting 5.0 stable is proving to be a real *****. This chip seams to want more voltage than I am willing to give.
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post #6412 of 10697
Quote:
Originally Posted by Tom Thumb View Post

Your welcome. I hope they help.smile.gif

Thanks again they did help... I'm tweaking to get lowest possible temps. My second core is right at the 75c after a few hours of P95 blend. I'm thinking about trying another TIM or reapplying AS5. I took the third fan off my Phantek PH-TC14PE (since it doesn't seem to making any difference on load temps) and used it with the provided bracket to cool my GTX570 (next on the OC list).
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post #6413 of 10697
Alrighty, I passed 40 mins EACH of 1344 and 1792 @ 1.44v...hope that's good enough!

Only the overnight will tell.
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post #6414 of 10697
I thought I'd try this, put Multi to 49 and found that my chip needs 1.496-1.504v to be prime Blend stable (well, stable enough to run the hour I let it). Temps peaked at 75 degrees.

For 24/7 use I use offset and 103x46 which needs 1.43v. I hate this chip and can't wait for Ivy, do these chips just stop working or will it simply degrade over time if I choose to punish it for being a poor performer?
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post #6415 of 10697
Hey guys, I was hoping you guys would be able to help give me a little direction here. I just finished a new build, so time to start pushing it. I've read through all the guides, I'm just trying to figure out where I want to start. I was just playing around with multipliers and voltages trying to figure out what my first goal is. Since I am on air cooling for now, I don't want to go too crazy until I know how this chip responds.

I was basically just testing to see how low a voltage I could set at a given multiplier in order to be able to successfully boot into Windows in order to gauge a starting point. Here is what I found so far:

PLL Overvoltage Disabled

x47 - 1.26v (BIOS), 1.264v (CPU-z)
x48 - 1.29v (BIOS), 1.288-1.296v (CPU-z)
x49 - 1.32v (BIOS), 1.32v (CPU-z)

PLL Overvoltage Enabled

x50 - 1.35v (BIOS), 1.352v (CPU-z)
x51 - 1.395v (BIOS), 1.4v (CPU-z)

I didn't want to try anything over that, though I was quite surprised with how linearly the voltage requirement increased all the way up x51.

Now, I understand, that there's no telling where stable voltages might end up, but I was still somewhat encouraged by being able to login to Windows at a x51 multiplier.

I haven't changed much, so far, and here is the pertinent info:

Memory is locked at 1600 Mhz @ 1.5v, 9-9-9-24

EPU Power Saving - Disabled
LLC - Ultra High
VRM Frequency - 350
Phase Control - Extreme
Duty Control - Extreme
CPU Current Capability - 140%
VCCIO Voltage - Auto
PLL Voltage - Auto
CPU Spread Spectrum - Auto
C3 - Enabled
C6 - Enabled

So the next step is to pick a multiplier as a goal and try to nail down sweet spots for VCCIO and PLL voltages, correct? What would be a good place to start? x47? x48?

Thanks in advance.
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post #6416 of 10697
Hey guys I made some progress too:

338

As you can see I reverted to stock values for the RAM for now while I figure out why it's not stable at the advertised frequency, but the CPU and GPU are OC'd quite a bit, have I managed decent overclocks? Also, is my SuperPi result respectable?

I'll be back once I get my Dominators to run at over 1600MHz.
post #6417 of 10697
am i supposed to use fixed voltage or offset voltage?

im using a z68 asrock board and a 2500k
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post #6418 of 10697
I use fixed voltage until I get an overclock I am happy with, then I work on changing it to offset,
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post #6419 of 10697

I know that this thread isn't supposed to be about voltages and temperatures, but I'd like to point something out to the people pushing from a nice 70-75C at 4.7 GHz to try to hit 4.9GHz at 90-95C.

 

You're going to hit a thermal wall and your CPU is going to throttle itself due to being near or at TJMax at some point. There are programs out there that run significantly hotter than Prime95 (Such as Intel Burn Test or even some folding WUs) and your'e going to smoke your chip or at least throttle yourself into low performance until the temperatures cool down unless you change it.

 

Also, you're going to be consuming huge amounts of power and even if you've changed your board to use current/power monitoring instead of thermal monitoring, you're going to get hidden internal throttling due to power consumption. I know, because I tested this. I actually found that at 4.7 GHz my GFlops in IBT could be anywhere from 123.2 up to 127.1 depending on my Vcore. The lower the Vcore, the higher the GFlops and thus the better my performance was.

 

My point here is that it's not all about how fast your clock is; it's about how efficient your overclock is. Temperature and power are closely related, as temperature is simply electrical power that has been wasted, converted into heat instead of into processor cycles. So for those of you struggling to hit 4.8 or 4.9 GHz at 1.45 to 1.48 Vcore and 90+ C, you're shooting yourselves in the foot. Either sell your CPU and buy a new one, hoping that you get a "golden" chip, or just clock yourself down to 4.6 GHz and enjoy faster computational performance at a cooler and more power efficient clock.

 

 

</rant>

 

 

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post #6420 of 10697
Quote:
Originally Posted by shad0wfax 
I know that this thread isn't supposed to be about voltages and temperatures, but I'd like to point something out to the people pushing from a nice 70-75C at 4.7 GHz to try to hit 4.9GHz at 90-95C.
...


Good post. Makes me feel better about giving up on going for 5.0 and sticking with my 4.9 @ 1.432v high 70s setup. I cant believe how much more voltage it rake going from 4.9 to 5.0...around .055v more.
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