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Intel Core i3/i5/i7 & LGA-1156 Club & Discussion - Page 117

post #1161 of 1646
Quote:
Originally Posted by Mikecdm View Post
Looks like fun, I'm thinking about picking up the pentium model or the the low i3 if it's not that much more expensive.
Which one is the Pentium model? Is it on NewEgg?
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post #1162 of 1646
I found it! $98 for it at newegg.
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post #1163 of 1646
Quote:
Originally Posted by nathris View Post
Its A51.

All I did was enable SpeedStep and turbo mode and when I went back the target cpu frequency said 190x21. The multiplier still said 20, but I upped the BCLK to 191, since 190x21 is only 3990 and rebooted, and it showed up as 21x.

The only thing I don't really like about this board is the horrid vdroop. I had to up the voltage a little because it dropped below 1.329 for a second and one of my cores exploded.

(Figuratively speaking)
have you tried "without vdroop", I have been using it and have no vdroop at all, vcore is usually .01 or so above what I set in bios.

So speedstep doesn't interfere with your clocks? Also, I was worried that with an overclocked cpu, especially at 4ghz, that the turbo would go crazy when it kicked in.

What does speedstep step down to when idle? what does turbo kick up to on a single threaded app?
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post #1164 of 1646
Quote:
Originally Posted by mtbiker033 View Post
have you tried "without vdroop", I have been using it and have no vdroop at all, vcore is usually .01 or so above what I set in bios.

So speedstep doesn't interfere with your clocks? Also, I was worried that with an overclocked cpu, especially at 4ghz, that the turbo would go crazy when it kicked in.

What does speedstep step down to when idle? what does turbo kick up to on a single threaded app?
If you set the `Turbo Boost` to `Auto` it dunt go crazy it helps stabilize the clock
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post #1165 of 1646
Quote:
Originally Posted by mtbiker033 View Post
What does speedstep step down to when idle? what does turbo kick up to on a single threaded app?
If you enable speestep and turbo and disable C1E and CState in the bios on the EVGA FTW it will lock in your x21 multi if you have it already set to x20 multi. If you enable CState it will activate the x24 multi on the i5 750 for only up to two threads otherwise it will drop back to x21. If you enable C1E it will raise and lower vcore on the fly according to cpu demand. You will obviously need more vcore to run the x24 multi for 1 to 2 threads and still keep the cpu stable for a given bclk then running the x21 multi for 4 threads.
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post #1166 of 1646
Quote:
Originally Posted by PolRoger View Post
If you enable speestep and turbo and disable C1E and CState in the bios on the EVGA FTW it will lock in your x21 multi if you have it already set to x20 multi. If you enable CState it will activate the x24 multi on the i5 750 for only up to two threads otherwise it will drop back to x21. If you enable C1E it will raise and lower vcore on the fly according to cpu demand. You will obviously need more vcore to run the x24 multi for 1 to 2 threads and still keep the cpu stable for a given bclk then running the x21 multi for 4 threads.
thanks for the explanation!

so by using the speedstep + turbo you can hit the x21 multi which means you could lower cpu freq and possibly vcore?
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post #1167 of 1646
Quote:
Originally Posted by PolRoger View Post
If you enable speestep and turbo and disable C1E and CState in the bios on the EVGA FTW it will lock in your x21 multi if you have it already set to x20 multi. If you enable CState it will activate the x24 multi on the i5 750 for only up to two threads otherwise it will drop back to x21. If you enable C1E it will raise and lower vcore on the fly according to cpu demand. You will obviously need more vcore to run the x24 multi for 1 to 2 threads and still keep the cpu stable for a given bclk then running the x21 multi for 4 threads.
I have a core i5 750 running at 3.5Ghz (167x21) with turbo boost and all the other options enabled. So with turbo mode it goes to 4.0Ghz (166x24). With my cpu vcore at 1.26xx (1 or 2 ticks above the default voltage) I was able to run prime95 on all 4 cores for 10 hours straight with no error.

Then I tried running just 1 thread of prime95 and setting affinity to only core 0, so that turbo mode would enable and the core would be running at 4.0Ghz. Not surprisingly, it failed after several hours. I ticked up Vcore another notch to 1.27xx and tried again. This time it worked for over 8 hours, so I tried switching processor affinity to core 1. Core 1 failed after about 6 hours.

To get turbo mode stable, should I keep increasing Vcore alone, or is the problem that I need to also raise PLL voltage or QPI voltage as well?
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post #1168 of 1646
Not sure if it'll help Bjgood, but I'm doing the exact same thing with a 150 BCLK and I'm 100% stable even when I set affinity to each individual core. Fill out your system specs if you can!

Vcore 1.2 with LLC (Vdroop)
VTT 1.19
PCH 1.120
CPU PLL 1.860V
Edited by Jocelyn84 - 1/18/10 at 10:29am
     
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post #1169 of 1646
Thread Starter 
You can fill out your computer specs here: http://www.overclock.net/specs.php

     
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post #1170 of 1646
Quote:
Originally Posted by Chilly View Post
You can fill out your computer specs here: http://www.overclock.net/specs.php

Filled out my specs, its not listing the overclock speeds though

Anyway, I kept the vcore the same and changed qpi/vtt from 1.15 to 1.2, CPU PLL from 1.8 to 1.9. Its running now on a single core and I'll see what happens.

I'm kind of guessing here at what is actually causing the failures. It may turn out that this will have no effect and I just needed to keep raising vcore, or maybe I needed to raise all three of them. If anyone has an idea of what the most likely voltage is that I need to change let me know.
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