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Q6600 overclock from 3.4 to 3.6, is it worth it? - Page 4

post #31 of 40
I'm with The_0ctogon. No idea what GTLv or PLLv is. Enlightenment, perhaps?
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Mr. Bubbles
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post #32 of 40
GTL explained-
Quote:
Originally Posted by tomb18
GTL (Gunning Transceiver Logic) is a reduced swing I/O driver technology support high speed buses and backplanes. Typically it uses a reference voltage derived from the vrm's to establish the swing from 0.4V to 1.2V. If the reference voltage is increased the swing increases and the noise susceptability of the bus decreases.

The reference voltage is input directly to the cpu and is derived from the Vtt voltage on the vrm's. The intel specs say it is derived from precision 1% resister divider networks but it could also be done other ways as is the case in the rd600 board design.
There are no pull up or down resisters involved in this circuit (they on on the die itself) so it is unlikely a pencil mod will do anything. On the other hand if a board does use resisters to establish the reference voltage, then maybe it would work.
This voltage is really critical to the operation of the fsb and it is probably best to just buy a board that supports changing it in software.
But, perhaps all boards do but they just havn't made the setting of it accessible in the bios.
in short- if you dont have a GTLv adjustment, then adding FSBv WILL help stabilize, especially in the case of a Q4..as DualCores, do not require as much GTLv to remain stable at higher FSB's.

PLLv is related to the PLL clock and its value. Raising PCI-E freq typically requires that you raise the PLLv to prevent sata errors. In addition to the PCI-E clock, the PLL also controls the PCI clock.

..sorry for the 'brief' explanation on my previous post.

link for more topics on Q4 GTLv control and its affects on stability-> Here
post #33 of 40
I still don't get it. But I can lookup the acronyms.
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post #34 of 40
Thread Starter 
I just benchmarked both 3.4Ghz and 3.6Ghz with 3dMark06. With 3.4Ghz I got 14,902 3dMarks, and with 3.6Ghz I got 15,099. So that's a 200 3dMark gain for a 200Mhz increase. Which is -if my math is correct- a whopping 1.3% gain. Right now I'm running 3.4Ghz and my idle temp is around 31C, with 3.6Ghz it's around 43C which is a 27.9% increase in idle temp. I don't really think it's worth keeping 3.6Ghz, so I'm reverting back to 3.4Ghz. Thanks for the help anyway.
    
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post #35 of 40
And that is why I got rid of my Zalman and got a TRUE instead...
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post #36 of 40
did you miss->
Quote:
This voltage is really critical to the operation of the fsb
A quad needs more FSBv or GTLv to be stable at higher FSB's than a dual core needs. If you still dont understand, just Google "quad GTLv" and do some reading of your own. GTLv is the limiting/determining factor to hitting high FSB's and some chipsets are better at managing GTLv for multicore cpu's than others.
post #37 of 40
Thread Starter 
Quote:
And that is why I got rid of my Zalman and got a TRUE instead...
My problem wasn't that the temps I was getting with 3.6Ghz was too high for the Zalman to handle, it was just that I wasn't going to keep the CPU running at .1V higher for a 1.3% increase in performance.
    
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post #38 of 40
So is GTL, Gunning Transceiver Logic? If so, I'm with ya...
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post #39 of 40
im currently in the same boat as you. im stable up to 3.5 GHz @ 1.34v and working on 3.6, but it requires over 1.4v at least.
    
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post #40 of 40
Quote:
So is GTL, Gunning Transceiver Logic? If so, I'm with ya...
Yes.. It is.
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