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i7 3930K 5 ghz prime95 test - Page 2

post #11 of 89
6/5/12 at 9:15am
5GHz prime stable is a difficult task on 6 cores. Congrats! thumb.gif
Here is the picture when I tried that. But I didn't run it for a long time.
521
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post #12 of 89
6/5/12 at 10:46am
Thread Starter 
Quote:
Originally Posted by foxrena View Post

5GHz prime stable is a difficult task on 6 cores. Congrats! thumb.gif
Here is the picture when I tried that. But I didn't run it for a long time.
521


Thank you. Yes it is a difficult task. Concerning your attempt for 5 ghz stability, how did you achieve such low temperatures? Winter temperatures or with cold water or something else ? What were your LLC settings in the BIOS ? I noticed that with more aggressive settings regarding LLC i managed to reduce the vcore value. Of course this step implies mosfet water-cooling. It is interesting that with medium LLC I couldn't manage to stabilize the CPU even with 1.525 vcore.
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post #13 of 89
6/5/12 at 11:04am
Quote:
Originally Posted by hcn View Post

Thank you. Yes it is a difficult task. Concerning your attempt for 5 ghz stability, how did you achieve such low temperatures? Winter temperatures or with cold water or something else ? What were your LLC settings in the BIOS ? I noticed that with more aggressive settings regarding LLC i managed to reduce the vcore value. Of course this step implies mosfet water-cooling. It is interesting that with medium LLC I couldn't manage to stabilize the CPU even with 1.525 vcore.

Your guess is right, in the test I used winter cold air for my water cooling rack smile.gif But I do have a TEC block that works all seasons.
I set LLC to high. In that case the Vcore doesnot drop under load. If you open a CPUZ to monitor the real-time cpu voltage, you'll notice it. It's good to NOT allow Vcore drop under load, that will lower your Vcore setting in BIOS, thus reduce your idle voltage.
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post #14 of 89
6/5/12 at 12:36pm
Thread Starter 
Quote:
Originally Posted by foxrena View Post

Your guess is right, in the test I used winter cold air for my water cooling rack smile.gif But I do have a TEC block that works all seasons.
I set LLC to high. In that case the Vcore doesnot drop under load. If you open a CPUZ to monitor the real-time cpu voltage, you'll notice it. It's good to NOT allow Vcore drop under load, that will lower your Vcore setting in BIOS, thus reduce your idle voltage.

Even with LLC on high i noticed a slight vdroop, especially on high cpu load. Only with LLC on very high i didn't notice vdroop, but rising in vcore with high cpu load. But then the problem is heat output. On your profile picture i noticed a nice case with 2 x 480 and 360 rad. What are your temps with current overclock on prime load? Did you try 5 ghz priming with TEC cooler? If did, what were the temperatures?
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post #15 of 89
6/5/12 at 12:40pm
Very impressive!
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post #16 of 89
6/5/12 at 1:16pm
Thread Starter 
Thank you.
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post #17 of 89
6/5/12 at 5:27pm
Quote:
Originally Posted by hcn View Post

Even with LLC on high i noticed a slight vdroop, especially on high cpu load. Only with LLC on very high i didn't notice vdroop, but rising in vcore with high cpu load. But then the problem is heat output. On your profile picture i noticed a nice case with 2 x 480 and 360 rad. What are your temps with current overclock on prime load? Did you try 5 ghz priming with TEC cooler? If did, what were the temperatures?

I didn't try 5GHz with TEC. The heat is just a bit too much for my dual TECs. But I have one with 4.9GHz. Core temps are in 50s:
http://www.overclock.net/t/1228364/project-dual-tec-block-on-lga2011-i7-3930k/0_100#post_17076746
On water, my CPU is not prime stable at 5GHz. For 24/7 I run it at 4.6GHz, 1.375V, prime core temps in 50s.
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post #18 of 89
6/5/12 at 5:29pm
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hcn, I'm curious if you have a kill-a-watt or anything to show watt consumption? I hear alot of different things in regards to 3930k OC'd power consumption. Thanks.

- Nice OC
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post #19 of 89
6/5/12 at 5:40pm
Quote:
Originally Posted by jagz View Post

hcn, I'm curious if you have a kill-a-watt or anything to show watt consumption? I hear alot of different things in regards to 3930k OC'd power consumption. Thanks.
- Nice OC

When overclocked over 4.8/4.9GHz, the system power consumption is over 500W during prime (measured by my kill a watt).
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post #20 of 89
6/6/12 at 1:41pm
Thread Starter 
[/quote]
Quote:
Originally Posted by jagz View Post

hcn, I'm curious if you have a kill-a-watt or anything to show watt consumption? I hear alot of different things in regards to 3930k OC'd power consumption. Thanks.
- Nice OC

Thanks. Unfortunately i didn't measure power consumption with a device. I believe that system power consumption is over 500 W, like foxrena wrote. Anyway my AX 850 power supply was sufficient for the task.

Quote:
Originally Posted by foxrena View Post

I didn't try 5GHz with TEC. The heat is just a bit too much for my dual TECs. But I have one with 4.9GHz. Core temps are in 50s:
http://www.overclock.net/t/1228364/project-dual-tec-block-on-lga2011-i7-3930k/0_100#post_17076746
On water, my CPU is not prime stable at 5GHz. For 24/7 I run it at 4.6GHz, 1.375V, prime core temps in 50s.


So 4.6GHz, 1.375V, prime core temps in 50s is only on WC, without TEC ? In other words that are temps with 2 x 480 and 360 rad?
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