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Overclocking to 4.0 GHz – FSB1600 Offers no Advantage

05:01 - Monday 29 October 2007 by The editorial team
Source: Tom's Hardware UK – Keywords: intel, core2, penryn
Categories: Hardware

Table of content:

Overclocking to 4.0 GHz – FSB1600 Offers no Advantage

The Core micro-architecture was designed in such a way that it only needs to access the main memory very rarely. This is achieved by letting the processor loads data speculatively. The larger 12 MB L2 Cache (2 x 6 MB) reduces the processor’s dependence on the RAM even further.

This is why increasing the speed of the northbridge, which contains the memory controller, by ca. 25% to 400 MHz (1600 QDR) has practically no impact. A performance increase of 0.5% across our benchmark suite compared to FSB1333 is completely unnoticeable to any user.

Intel Penryn 45nm

Thus, the only thing a higher FSB will get you is a minor increase in power consumption by the northbridge as well as potential instabilities on the P35 and X38 chipsets, neither of which officially supports FSB1600.

At least in the desktop segment, it is obvious that FSB1600 will be offer more marketing potential than actual performance benefits.

At Intel’s “Meet the Penryn Experts” event in Munich, an Intel representative confirmed this by saying “On the desktop, I don’t think FSB makes a difference”. Nonetheless, it has become known that FSB 1600 processors, which will require the new X48 chipset, will be released next year.

Intel Penryn 45nm

Running at 4.0 GHz, our processor was able to gain up to 19% more performance in our benchmark suite. However, the high voltages needed to ensure stable operation prevent this performance advantage from being used over extended periods of time.

For out tests, we used DDR2-800 memory running at the JEDEC-specified latencies of CL 4.0-4-4-12.


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Bik3r 29/10/2007 15:09
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Just a small typo on the first line on thelast page... i'm sure the word that is meant to be there is "reticent". Other than that an excellent, informative and thorough review, thank you :D

spuddyt 29/10/2007 18:11
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wow... poor amd :(

leexgx 29/10/2007 22:42
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the green bars are getting smaller for AMD :(

i still going to get an AMD64 5000+ Black edition as my server needs an new cpu, mobo and ram

i do not want to replace my motherboard just yet as it performs Fully stable for me and i not looked into stable/good OC boards for Intel yet

but darn that CPU has some power behind it lol

Bik3r 30/10/2007 12:30
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Yup.... AMD seems pwned for the time being :( Bad for them and surely bad for us :( I hope their quadcore (on a single chip) solution is a success...

bobwya 30/10/2007 08:57
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Are THG listening to the readers? This is a lot better than articles of recent times!! Now what about the follow up article... 'Penryn Hitting 5Ghz on ambient watercooling!!'.

Thanks guys!!

Bob

PS Like the detail on the new SSE4.1 instructions + history of SSE instructions - nice touch!!

mi1ez 30/10/2007 10:00
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I agree with Bob- It's nice to get a decent, in depth technical article, the likes of which got me reading THG in the first place!

thechevron 31/10/2007 19:37
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I like the picture at the bottom of page 9. Nice toastie air blowing right into the arse end of that video card, just as well its not a scorchy pentium 4 :))

crackez 02/11/2007 15:49
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Yes indeed it will be nice to see how well it performs with a watercooling system, who knows even liquid nitrogen will be nice.. If they reach with Intel Pentium 4 more than 5GHz I wonder how much GHz might give a 45nm processor heheh

P.S. With liquid nitrogen I'd like to see how well it performs TOO!! [of course a more simple solutions like a watercooling overcloking still is a good thing, especially if it's in a video to see exactly what is going on]

godman 04/11/2007 23:34
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Sounds like a 805 ... only more expensive, faster and twice the cores :P

crackez 06/11/2007 03:32
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I thought I left some feedback a few days ago.. oh well I was just saying why not a review of an overclocked intel processor reaching lets say 5Ghz? or even 6GHz with some liquid nitrogen perhaps. I currently have an Athlon 64 X2 5000+(running on more than 3.1GHz on water from 2.6GHz and planning for some peltier stuff soon to reach over 3.5-4 GHz)

anqe 17/11/2007 20:57
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I think 4GHz is slightly disapointing and production samples will rapidly push past 4GHz once they hit their second spin.

If we're already seeing 3.6GHz+ air cooled on Q6600's @ 65nm then another 20% hike in speed should be pushing it to 4.2GHz easily.

The scary thing for all should be what the hell happens when Intel take away AMD's only defense in the way of adding a memory controller to the die. Low latency access with a shared L2 and ridiculously scalable frequency leaves AMD looking a rather poor second choice.

With Intel sandbaging already and enjoying healthy margin that is only going to be worse for AMD later on.

Danny24 21/03/2008 12:31
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Whilst the article makes for very interesting reading why did TH choose to test the QX9650 CPU? This is one of the most expensive processors on the market today and well beyond the reach of all but the most well off users.

I understand that you want to achieve the best results possible and therefore chose the best performing processor for the job. However, this particular processor is the only one available with an un-locked multiplier. The majority of users don't have this luxury and only have an option to increase the FSB if they want to overclock their system. This sort of makes the test you've performed redundant for the majority.

A much better processor to test would have been the Q9550. While it's eventual clock speed wont match that of the QX9650, percentage wise it should be near as damn identical.

Otherwise, great article :-)

bobwya 21/03/2008 22:52
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Danny24 :
Whilst the article makes for very interesting reading why did TH choose to test the QX9650 CPU? This is one of the most expensive processors on the market today and well beyond the reach of all but the most well off users.... Blah Blah



Wakey, wakey idiot... This thread is months old and thats all that was out at the time...

Bob

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