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Old 07-17-09, 12:11 PM   #1
Dolk
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Downcore that CPU

This is an experiment that I have been wanting to do for some time. I want to downcore my CPU and OC it. I have not read much research on it, and I don't think a lot of people are willing to try it.

So, if you have read anything, please let me know. I'm most likely going to try this out come this Saturday.

EDIT 1: Charts!

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The max speed recorded was 4.3ghz, this was done on Dry Ice. With each step down I was able to play around with the CPU-NB a bit more and the overall speed more. But nothing to significant. I blame this mostly on the fact that I couldn't get the temp below -20C.

As for what I received with results, I must say they are not what I expected. On whole I believed that the SuperPi 1M was going to be much different. What I'm not surprised is the scale with Wprime and Cinebench. These programs rely a lot on the number cores on the CPU.

As for the Crysis graph, I'll help explain how it is setup. The first bar dictates the min FPS, the second set of bars dictates the max FPS, and the last set of bars dictates the average FPS. Note that in some cases, Crysis was slower when it should have been much faster. Since most of this was done consistantly in the same day, I believe that this is just an error with the software rather than something with the hardware.

In conclusion of these preliminary tests, I can see that the number of cores, when applied to the right application, will due its part along with how fast it is. Basically its doing what it is suppose to do. The next update will show how fast I can push 1 core, 2 core, and 3 core. This will come some time after I get my LN2

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Old 07-17-09, 12:15 PM   #2
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I would help but Im not entirely sure what the word "Downcore" means. Unless you are trying to say disable 1,2,3 cores of a quad and overclock a single core? Its been done before without a doubt as one core is usually for some reason stronger. I just remember posts saying, "yeah thats nice, but what about the other cores".

Im looking for your ATI results regarding vantage and PPU from that other thread. I did some work on it but dont have an ATI card to confirm.

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Old 07-17-09, 12:22 PM   #3
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oh lols, that won't happen until this weekend as well, or tonight. Depends on the GF factor with the X,Y Parent Principlie that is overall being controlled by the Fate theory.


And yes I do mean disabling cores

I come up with strange and sometimes un-needed words that describe some action.

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Old 07-17-09, 12:37 PM   #4
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Down Core: Term coined by Dr. Dolk OC.

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Old 07-17-09, 12:48 PM   #5
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with all this respect, I wonder if i can make a cult...

Quick Mods, make me a channel just for people to praise me!

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Old 07-17-09, 01:13 PM   #6
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Quote:
Originally Posted by Archer0915 View Post
Down Core: Term coined by Dr. Dolk OC.
Nope... K10stat beat him to it .
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Old 07-20-09, 03:28 AM   #7
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Can someone tell me how to do this?
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Old 07-20-09, 10:26 AM   #8
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why in the world would u wanna do this???

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Old 07-20-09, 10:54 AM   #9
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You do it using the ACC feature in the BIOS.

The reason to do it? Who knows, it could bring about better performance, it could some how destroy my CPU, it could bring back the originial Pirate Bay. All of wich I some how want but probably won't happen.

I'll be working on this project for the rest of the week so make sure to come back and read

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Old 07-20-09, 11:02 AM   #10
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Quote:
Originally Posted by Riqand View Post
why in the world would u wanna do this???
Read post #2.

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Old 07-20-09, 04:38 PM   #11
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I still doubt this will be a very good idea. Even if you can disable or down core one of the cores, you will still probably get a very small increase in top speed by doing so and in order to make a difference in any applications the increase would probably have to be larger than 100 or so mhz.

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Old 07-21-09, 12:06 AM   #12
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Ah,i think i get you,you want to shut off some cores to see what speeds the actually cores can do individually to see if its worth getting better cooling.

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Old 07-21-09, 06:25 AM   #13
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Quote:
Originally Posted by ChanceCoats123 View Post
I still doubt this will be a very good idea. Even if you can disable or down core one of the cores, you will still probably get a very small increase in top speed by doing so and in order to make a difference in any applications the increase would probably have to be larger than 100 or so mhz.
Maybe he benchmarks?

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Old 07-21-09, 10:47 AM   #14
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Its not just about cooling, but about everything that comprises the CPU itself.

I did my first round of tests, started off with 1 core. I'll be posting my results later today in my first post, so keep an eye out for that. What I can say is that there is some changes that you guys may like

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Old 07-21-09, 12:03 PM   #15
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^ Cool I will be waiting on the results and maybe I will downcore my 3 cores to 2!

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Old 07-21-09, 12:34 PM   #16
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Quote:
Originally Posted by ChanceCoats123 View Post
I still doubt this will be a very good idea. Even if you can disable or down core one of the cores, you will still probably get a very small increase in top speed by doing so and in order to make a difference in any applications the increase would probably have to be larger than 100 or so mhz.
Why are any of us here at ocforums?

To tinker and mess around with things just for the heck of it.

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Old 07-21-09, 12:36 PM   #17
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Be careful of using a single core with windows. I know at least with XP it was an issue where if you went from a multi-cored PC to a single one and back to multi (turing HT off, or if there was 2 CPU's in the system) it would error out due to the hal.dll being switched and needing to copy it back into the system32 directory (the proper multi-threaded hal.dll that is).

Just word of warning.

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Old 07-21-09, 12:37 PM   #18
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Like i have mentioned, I have only seen it for benchmarking purposes to eek that extra, for example, .1 second in Superpi for some boints. Power consumption/savings would be negligable to me b/c if that is breaking the bank, you have other issues to deal with.

Im still looking forward to the results though.

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Old 07-21-09, 12:42 PM   #19
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I can say that the power and temps were dramatically lowered, but is to be expected due to 3 cores being turned off. As far as benchmarking... well lets say I still got a long way to go.

Now were did I leave that dri ice...?

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Old 07-21-09, 05:16 PM   #20
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Quote:
Originally Posted by EarthDog View Post
Maybe he benchmarks?
Quote:
Originally Posted by Maverick0984 View Post
Why are any of us here at ocforums?

To tinker and mess around with things just for the heck of it.
Just stating my opinion on the topic. I have done my fair share of tinkering for the hell of it, but I was just expressing the issues I saw with this particular idea.

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Old 07-22-09, 02:49 AM   #21
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Old 07-22-09, 10:17 AM   #22
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So I have Dice runs planned for tomorrow. Tonight I'll be posting my intial WC runs. So far things have been working great, and the results are so far consistant.

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Old 07-22-09, 10:35 AM   #23
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Sweet. Before you do all that jazz, how about the PhysX runs? Those would take 20 minutes.

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Old 07-22-09, 10:45 AM   #24
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Fun experiment Dolk. Never thought about trying it myself (I am more of the mind of trying to get MORE cores out of my CPUs ) lol

Will be interesting to see your results though and how much of a differnce you can make

Have you already isolated your strongest core? Or are you just going with core0?

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Old 07-22-09, 11:23 AM   #25
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Quote:
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Sweet. Before you do all that jazz, how about the PhysX runs? Those would take 20 minutes.

I still need to post the pics, but I can say that there was only a 100 or 1000 points difference. Which means it didn't help or hurt at all. I'll post those as well tonight

@Nec: I have not isolated which core is the strongest just yet. I hope to do that tonight.

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Old 07-22-09, 12:59 PM   #26
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Should be some interesting results!

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Old 07-23-09, 10:43 AM   #27
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So I left work real late yesterday. I was not able to do any testing yesterday, so again no updates. Most likely none until next week

Sorry to disaopint most of you guys. Please make sure to subscribe!

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OCZ B.E. ~*~ OCZ
M4A89GTD Pro ~*~ A8N-SLI Dlx
1td HDD ~*~ 2.2 td raid 5
currently has .2748428927348 internets
create your own rules to find the answer
be proud of the pink stars
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Old 07-23-09, 11:14 AM   #28
QuietIce
♫ ♪ ♫ OC*SETI's Senior ♫ ♪ ♫ AMD Cruncher

 
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Join Date: May 2006
Location: Kansas City, MO ... The City of Fountains
 
So what are you saying - your work is interfering with overclocking?!?
Man, you gotta' get a different job!


BTW - What are you doing this summer, something career related I hope ...?

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Everyone likes to BOINC! ......... Upgrade those optimizers!!! ..............................Heatware..............................cucumber
.Newest additions to the farm -> ...........CentaurB, Phen9950, and Quadary

Opteron 180 @ 2.8 GHz||A8N32-SLI||Corsair TwinX2048-3500LLPro||ASUS 7900GTX||Tt680W PurePower||4x WD-SE16
Copper"T" with 3/4" tubing>MCP655#1>Storm(Opty165)>2-302 HC w/2x141CFM Delta's>MCP655#2>Storm(Opty180)>MCW60

The only thing I can presume, since I know I'm not crazy (certifiably at least), is that everybody else is until they prove otherwise! -howetechnical
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Old 07-23-09, 12:00 PM   #29
Dolk
Why does this keep happening? Senior

 
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Location: St. Louis MO
 
Send a message via AIM to Dolk
Network Intern... Not really part of the Computer Engineering programm but it pays pretty well

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sam ~*~ dolk
1090T ~*~ Opty 185
4870 Matrix ~*~ 8600GT
OCZ B.E. ~*~ OCZ
M4A89GTD Pro ~*~ A8N-SLI Dlx
1td HDD ~*~ 2.2 td raid 5
currently has .2748428927348 internets
create your own rules to find the answer
be proud of the pink stars
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Old 07-24-09, 03:36 PM   #30
oldbrave
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Join Date: Apr 2009
Location: Sacramento,Ca.
 
Here ya go Dolk, this is my 940 on just 2 cores, didn't touch anything but raise the multiplier one step !



Haven't run any stability tests yet but it seem solid !

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Electronic Smoke Signals From my "Techno Teepee"
AMD Phenom II x4 965BE c3 @ 4032Mhz(16.0x252)1.54v
HT 2520Mhz @ 1.22v, NB-CPU 2772Mhz @ 1.2875v
Koolance EXOS-2.5, CPU 350AT WB, Idle=30c Load=44c
ASUS M4A79-T Deluxe AM3 790FX
8Gb OCZ AMD BE ddr3 1600 @ 1680Mhz-1.65v
1-64GB Corsair Extreme Series SSD, 1-WD 250Gb SATA 2, 1-WD 750Gb SATA 2
ASUS Radeon HD 5870 1Gb 950/1325, Cat 10.6, Dell 2407WFP
Win 7 Ultimate 64bit, Corsair Obsidian 800D, PC Power & cooling 750W
THANKS Dolk! :)
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