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O/C FSB vs Multiplier

post #1 of 13
Thread Starter 
I am currently running a 33x multiplier of my 133 bus at about 50C on load. About 25C max idle. I am just wondering if I should increase my bus speed to 200 and do a 23x multiplier instead.

My motherboard doesn't really have any cooling other than my case fans and my RAM has no fans. I am running on water though. I just want to know the difference between increasing bus speed or multiplier because it appears as if bus speed has significant advantages?
post #2 of 13

Hi xyeLz, don't go wild on overclocking if you don't have sufficient cooling for the system.

Higher FSB should get you better performance compared to higher multiplier!

There are overclocking guides on OCN found in my owners club or the front page of OCN right hand side.

Also, hope this would help you out... for reference and ask your question there! Unofficial Intel Core i7 980x Club

For reference:


Edited by ocman - 2/20/11 at 11:53pm
     
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post #3 of 13
133 x 33 = 4.4GHz
200 x 23 = 4.6GHz

But yes, usually running a higher bus speed will result in a better overall overclock. You would actually be looking at 192 x 23 if you wanted to use the 23x multiplier, and still get 4.4GHz.
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post #4 of 13
With all the uncore, and memory dividers, it really depends on what you are trying to do and what clocks you want to set. Where those speeds fall in according to all the different multi's is the goal. I personally don't like multi only overclocking, but wouldn't waste my time trying to push the bclk with that chip. I've seen a lot of high clocks with under 200 bclk on that chip. No reason to raise the QPI speeds too much on that motherboard.
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post #5 of 13
Thread Starter 
Thanks mateys

I technically DO have sufficient cooling, and even OVER sufficient cooling for the system, but I don't have anything other than stock for my motherboard. So you are right

I've got an EK block on my CPU. Ambient temps are about 25C and the CPU runs at 23 MAX idle. My lowest core, according to CPU-Z, was 14C, which I don't know if I believe because that's quite cold. I would say average around 19C. I've got 2xEK blocks on my GPU and 2x360mm radiators pushing with an MCP35x pump powering the loop. But I don't have a motherboard block. All I guess I have to cool the motherboard are my 3x120mm AP-14 GTs pulling air from the front, 3 of them pushing it out the top, and then 1 in the back on half speed pushing out the back.

Originally, I really wanted to try for 4.6GHz overclock at 1.35v but I just think that's out of the question. I feel like I would only be stable at 1.4v and from what I've been told, I shouldn't be doing that. I WOULD be happy at 4.4GHz if I can swap around my FSB a bit. That is, instead of doing 133MHz FSB at 32x multiplier, I can do 200MHz FSB at 22x multiplier (4.4GHz). Would that significantly increase the temperature of the CPU or motherboard? Or would that have no effect? Is 200MHz a normal FSB speed?

After that I would like to O/C my PC3-16000 Dominator GT to 2200MHz so I don't want to really damage anything. I'm not a hardcore benchmarker. I just want the best performance out of my PC without sacrificing lifetime.

I apologize for the stupid questions but I'm a noob here with serious concerns coming to the smart people who know the answers, haha. Any help would be great guys.
Edited by xyeLz - 2/20/11 at 11:33pm
post #6 of 13
Getting ram stable at 2200 is more of a difficult task than probably getting that chip at 4.4ghz. 200bclk is normal for chips with unlocked multi's. Too high of a bclk and the qpi starts to act up. Now getting ram stable at 2200 will require some good VTT and if your IMC is up to the task. I don't own a 980x and have never played with one, so I don't know how well their IMC are compared to a standard 920.
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post #7 of 13
I run 200x23, I get 29GB/s memory bandwidth using the x10 memory multi to give ddr3 2000MHz.
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post #8 of 13
Thread Starter 
So my motherboard and RAM isn't gonna burn up if I switch my CPU to 200 bus and 22x multi?

Then I might work on the RAM frequency.
post #9 of 13
Quote:
Originally Posted by xyeLz View Post
So my motherboard and RAM isn't gonna burn up if I switch my CPU to 200 bus and 22x multi?

Then I might work on the RAM frequency.
BCLK of 200 isn't gonna stress things too much. You'll probably have to increase your IOH voltage and QPI/VTT a bit to get it stable. Just have a play and see how you get on.

I need (I'm using a Gigabyte though):
1.88V PLL
1.42V QPI/VTT thats more to run RAM @ 2000MHz @ CL8
1.26V IOH Core (NB)
1.16V ICH Core (SB)

Sie
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post #10 of 13
Thread Starter 
Quote:
Originally Posted by YerMother View Post
BCLK of 200 isn't gonna stress things too much. You'll probably have to increase your IOH voltage and QPI/VTT a bit to get it stable. Just have a play and see how you get on.

I need (I'm using a Gigabyte though):
1.88V PLL
1.42V QPI/VTT thats more to run RAM @ 2000MHz @ CL8
1.26V IOH Core (NB)
1.16V ICH Core (SB)

Sie
Noob overclocker here so I apologize once again but what is the PLL, QPI, VTT, IOH, and ICH. I saw some guides but they didn't explain specifically what each one is or does?
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