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confused about happy OC specs like 5.0 Ghz

post #1 of 26
Thread Starter 
I'm not an expert by any means on overclocking but my question is, why are folks getting excited about 5.0+ Ghz but they are running x50 multipliers?

I guess the idea is to try & increase your FSB and lower the multiplier.

So I'm running my i7 930 @ 4.2Ghz (210x20) on a liquid loop with sub 38c no-load and sub 70c 100% load and I don't presume to brag because I see specs like crazy 260 - 350 FSB @ only 10 - 15 multi so I know that my 4.2 Ghz... which is great & all... is not the crazy FSB that I see some other guys running.

So when I do try & increase the FSB, that's where it gets hairy and you deal with memory OC and... upping the diff & more sensitive voltages... PLL/QPI etc... and it's not that easy.

So when I see things like the "5.0 Ghz" club... I don't mean to be rude but why is that impressive when it's like 100x50?

I thought FSB is the most important variable to try & OC because that's basically your NB & mem communication... or trying to just purely reach 5.0 Ghz is just as great from a performance standpoint?

Thanks in advance for setting me straight

Chris
Edited by smokiez - 1/18/11 at 9:58am
    
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post #2 of 26
Quote:
Originally Posted by smokiez View Post
I'm not an expert by any means on overclocking but my question is, why are folks getting excited about 5.0+ Ghz but they are running x50 multipliers?

Chris
With Sandy Bridge, that's the only option you have.

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post #3 of 26
The Sandy Bridge architecture does not really allow for fsb increases. 100 is kinda the "spot". Now, if you do some research, you'll see that is not entirely true, but generally you don't mess with the block or fsb of the SB rigs. That leaves you with multi for overclocking, which leads to the 50x100 clocks.
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post #4 of 26
Getting stable using the multi is just as difficult in terms of proper voltage and cooling. A 5ghz overclock says something about a CPU's ability rather than the NB/mem's speed.
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post #5 of 26
i do believe you have been set right
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post #6 of 26
Thread Starter 
Quote:
Originally Posted by obsidian86 View Post
i do believe you have been set right
via the above replies or my initial understanding that communication holds more weight for performance?

I honestly don't want to get in to the details of this argument because like I said... not an expert and I'm just talking about what I see as far as users running crazy FSB clocks... which has to be intentional since you put a lot more stress on both the CPU & the memory by tampering with the other voltages. Simply reaching for high Ghz does not seem to be the goal.

I could bump my multi to 22 and clock higher but instead I've been trying to do the opposite so I basically stopped and had to ask what gives because everyone is posting SS of 5.0 Ghz but.. super low FSB... super high ratio (not only the new SB procs but... other procs clocked leaving max ratio).

There seems to be 2 types of overclockers


Chris
Edited by smokiez - 1/18/11 at 10:40am
    
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post #7 of 26
Quote:
Originally Posted by smokiez View Post

There seems to be 2 types of overclockers


Chris
There has to be two types of overclockers, as you cannot overclock a Sandy Bridge CPU by using the same method people are using on previous generation Intel processors.

The multiplier is the only way to overclock a SB CPU.
post #8 of 26
Thread Starter 
Quote:
Originally Posted by jackbrennan2008 View Post
There has to be two types of overclockers, as you cannot overclock a Sandy Bridge CPU by using the same method people are using on previous generation Intel processors.

The multiplier is the only way to overclock a SB CPU.
That makes sense... I should have rephrased my post not useing x50 as a multi because it automatically imples a SB proc.

I'm saying I see the same situation with 920, 930.. etc procs where ratio is 21/22 and you bump the FSB ever so slighly and you're already at 4+ Ghz... and at the same time... via the same procs, you see users doing the opposite... dropping that 21 or 22 in favor of like 10 - 15 but upping the FSB to crazy hights.

I guess I should have been more clear... that's what i mean by 2 different types of overclockers. Same processors but people doing different things.

Chris
    
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post #9 of 26
so where does that leave us 775'ers ...lol ... HARDCORE.... i think not..i would be nice to not have to worry so much about the board and just hope you get a strong chip...
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post #10 of 26
I only know one type of overclocker.. the one that gets the highest Ghz number they can get while still stable. It just so happens to be raising the multiplier and voltage is the only way to do with SB versus previous architectures which allowed you to mess with more.

As far as memory bandwidth.. its been shown to be as high or sometimes even higher on Sandy Bridge even though its dual channel vs tri channel of the i7-900 series.
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