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955 BE Overclocking, few questions - Page 2

post #11 of 37
Quote:
Overclocking with the multi is okay, but a processor overclocked with the FSB rather than just multi, even if they're both clocked at the same speed, will always beat a processor overclocked on multi alone... plus you will OC the NB and the RAM in the process which can have a huge impact on numerous types of applications.

I'd disagree with this. BE series I'd clock purely by multiplier. My 4.0GHz B55 has a mild FSB OC only to keep the 17.5 multiplier so Cool-N-Quiet stays enabled. I think it's been proven enough times that FSB OC doesn't help performance, and it complicates things in that you'll need to adjust HT multiplier, RAM multiplier and CPU-NB multiplier to keep them all stable.

You can always bench and compare yourself, you'll find that the FSB OC doesn't help your performance. Likewise with CPU-NB overclocking, it's worth a mild bump at stock voltage but the only "benefit" is in synthetic benchmarks, maybe 1-2FPS In games.
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post #12 of 37
Quote:
Originally Posted by LtStinger View Post

This goes back on a lot of things I've learned here on OCN...while I agree that it could offer a greater learning experience, NB and RAM can be overclocked independently of the CPU. Everything I've read from the experts of overclocking here concludes that basically if your processor is at 3.8GHz and your NB at 2600 with your RAM at 1066, it doesn't matter how you got there. What matters, both in real world use and in benchmarking is the final numbers, IE clock speed. If this information is not correct, then it will surely provide a reason for me to OC using the FSB method, so what I'm saying is, I'm not trying to argue, but would like more detailed information proof.gif regarding this statement for my own personal development.

I believe user "PioneerIsLoud" who helped me immensely when learning to OC, was the one to explain this phenomena to me. I thought it sounded odd but he made it make some sense. Maybe you can contact him for an explanation, he's a nice dude...

If I can find his original explanation, or something online to support my advice, I will post here.

Edit:

http://www.overclock.net/t/306031/fsb-vs-multiplier#post_3543708

That thread has a lot of supporters of my advice... I don't know much about it, but somebody who does said do it, and so I do..

http://www.tech-forums.net/pc/f10/overclocking-fsb-vs-multiplier-168195/


So there's your proof.gif
Edited by FromUndaChz - 3/13/12 at 7:04pm
post #13 of 37
Quote:
Originally Posted by 2thAche View Post

Likewise with CPU-NB overclocking, it's worth a mild bump at stock voltage but the only "benefit" is in synthetic benchmarks, maybe 1-2FPS In games.

a 30% fps boost in minimum frame rate going from 2000mhz to 2600mhz in crysis warhead may have been 2800mhz. its posted in the forums.
also using 'auto' voltage isnt recommended. motherboards/bios always overvolt when set on auto
see how low you can get your vcore and still be stable.
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post #14 of 37
Quote:
Originally Posted by pc-illiterate View Post

a 30% fps boost in minimum frame rate going from 2000mhz to 2600mhz in crysis warhead may have been 2800mhz. its posted in the forums.
also using 'auto' voltage isnt recommended. motherboards/bios always overvolt when set on auto
see how low you can get your vcore and still be stable.

I've never seen any gains like that proven anywhere. My own testing on two different rigs showed single digit gains. %30? Someone is high. Crysis 2 is GPU limited lolz.
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post #15 of 37
Quote:
Originally Posted by 2thAche View Post

I've never seen any gains like that proven anywhere. My own testing on two different rigs showed single digit gains. %30? Someone is high. Crysis 2 is GPU limited lolz.


proof.gif
http://www.anandtech.com/show/3877/asrock-890fx-deluxe-full-review-and-an-investigation-of-thuban-performance-scaling/7

Anand:


What we did not expect was that a similar pattern would emerge from our CPU-NB testing. Our experiment with Thuban’s CPU-NB was truly strange. In applications that can take advantage of as many cores as 6, the gains achieved by CPU-NB overclocking was rather small. It’s there, but not to the point of writing home about. On the other hand, overclocking CPU-NB greatly benefited less-threaded applications, namely games. This can also be observed from the X264 HD 3.0 test, where the less intense first pass yields much better scaling with CPU-NB overclocking than the second pass.

We have no conclusive theory to explain this phenomenon at this time. Originally our suspicion was limited to CPU-NB’s frequencies and memory frequencies/timings, but now we wonder whether the size of L3, which is meager 1MB per core for the X6’s, comes into play as well. We are looking to further examine this subject in the future.



So, if we want to continue to argue about this.. my cpu is a 4.15Ghz and the NB is at 3100, the HT is at 2000 because overclocking it gives myself and others a decrease in 3d performance.

I will gladly run benchmarks with NB at 2000MHz and then at 2600, then 3100 and post the results if it comes to it.

The gains are there and we can quantify them easily with the graphs already supplied by Anand.

If PC is high, he's high and more or less correct, as am I - high and more or less correct...


One example is on the anand link above... HAWX gets 17FPS gains from 2Ghz NB to 3GHz NB... that's HUGE! (10% or so for free)
Edited by FromUndaChz - 3/13/12 at 7:08pm
post #16 of 37
no, i was not high at the time.

http://www.overclock.net/t/1116677/building-a-gaming-rig-700-800/40#post_14968064

you can say its gpu limited all you want. the cpu-nb matters. that is a fact.

700

kinda ninja'd by chz. these are MY results. 3 runs on both cpu-nb speeds. i took the middle score. each speed was 1-2 frames less or 2-3 frames higher on minimum.
Edited by pc-illiterate - 3/13/12 at 7:13pm
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post #17 of 37
hmmm...seeing as only the minimum FPS has changed, and it did not affect the max FPS whatsoever, it almost seems as though the NB freq overclock was effective as a buffer in dips. I wonder if the clock speed of the CPU itself was higher, something around, say, 4.5GHz, and the CPU was not maxed at that dip, if we would see similar results. thinking.gif
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post #18 of 37
2thAche just seems to like telling everybody they're wrong.. only to find out that he's wrong. He should really learn to use the GOOGLE MACHINE.

devil.gif
post #19 of 37
Quote:
Originally Posted by LtStinger View Post

hmmm...seeing as only the minimum FPS has changed, and it did not affect the max FPS whatsoever, it almost seems as though the NB freq overclock was effective as a buffer in dips. I wonder if the clock speed of the CPU itself was higher, something around, say, 4.5GHz, and the CPU was not maxed at that dip, if we would see similar results. thinking.gif

Look at the anandtech link I posted above... it's dependent on many factors - but the bottom line is that in general, the higher the NB, the better the overall gaming performance of the PC.
post #20 of 37
btw 2thache, a gpu can only run as fast as the cpu will let it. look at the difference between any i3,i5,i7 and ANY amd.
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