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post #541 of 560
I'm new to Intel so please bare with me. Say I'm going for 4ghz. In regards of performance, Is it better to have a lower BCLK with higher multi or vice versa?
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post #542 of 560
Quote:
Originally Posted by GsxR1000Ryda View Post
I'm new to Intel so please bare with me. Say I'm going for 4ghz. In regards of performance, Is it better to have a lower BCLK with higher multi or vice versa?
A higher BCLK will leave you with a higher memory frequency which is what matters on Intel boards. Depending on how fast your RAM is rated for, you can try messing with different multipliers and voltages as having a high CPU multiplier (low BCLK) will lead to lower voltages.
post #543 of 560
So finally got around to goofing with the processor. Decided to see if it would be stable with everything on auto and low vdroop. OC'n with just the multi felt so much less like black magic than OC'n my i7 920 to 4Ghz or my wife's i5 750. Although with this sucker hitting 4G on auto, finding it's limits might be fun!

So I tried IBT and was confused at why it went so fast.




So then tried LinX and was confused at why it went so slow lol....



Then finally realized it was the mem size...

So yea, add me - my simple 4Ghz with all auto and C1E on

30x133
CPU w/vdroop low - was at Auto (1.336v in CPU-Z)


Edited by werds - 1/24/11 at 4:50pm
    
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post #544 of 560
Quote:
Originally Posted by cory1234 View Post
@Ando, yes. I totally blanked on the clarkdale K's. You need at least 20 runs of IBT/Linx to be added though.








Edited by Ando - 1/25/11 at 2:55am
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post #545 of 560
Quote:
Originally Posted by GsxR1000Ryda View Post
I'm new to Intel so please bare with me. Say I'm going for 4ghz. In regards of performance, Is it better to have a lower BCLK with higher multi or vice versa?
If you want that little extra, you should go for higher Bclk, the Bclk it self don´t add any performance increase but since UnCore (L3 Cache and Memory controller) frequency derivative from the Bclk, the higher Bclk the higher UnCore frequency.

With higher Bclk you also get somewhat higher memory ratio to choose from.

UnCore frequency is second best performence increaser, first one is Core frequency, third one is ram frequency and then timing.



Checkout this comparison I did a while back with my i7 875k


Maxxmem comparision between different Uncore frequency

Bclk 133, Core ~4,0GHz, QPI ~2400MHz, Uncore ~2400MHz and memory at 1600C7

vs

Bclk 200, Core ~4,0GHz, QPI ~3600MHz, Uncore ~3600MHz and memory at 1600C7.

QPI link frequency ~2400MHz, Uncore Frequency ~2400MHz, Maxxmem 808,7


QPI link frequency ~3600MHz, Uncore Frequency ~3600MHz, Maxxmem 1160,7


y-cruncher comparision between Uncore 2400 and 3600

QPI link frequency ~2400MHz, Uncore Frequency ~2400MHz, y-cruncher 219,836


QPI link frequency ~3600MHz, Uncore Frequency ~3600MHz, y-cruncher 209,110



Higher Bclk > higher UnCore > a bit better performance.
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post #546 of 560
Quote:
Originally Posted by SimpleTech View Post
A higher BCLK will leave you with a higher memory frequency which is what matters on Intel boards. Depending on how fast your RAM is rated for, you can try messing with different multipliers and voltages as having a high CPU multiplier (low BCLK) will lead to lower voltages.
Quote:
Originally Posted by Ghostleader View Post

Higher Bclk > higher UnCore > a bit better performance.
Cool thanks for all the info guys. This is where I stand right now but I plan on bumping the BCLK higher soon and see how far i can go.
Attachment 192138
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post #547 of 560
Hi to all.
Iam a new overclocker and this is my best stable overclocking with normal temps on air (i think) for my i7 875k . I hope i can be in your stable list. 4013GHz, 20x200, vcore 1.30, vtt (imc) 1.30

Edited by jfmoto - 1/30/11 at 3:12pm
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post #548 of 560
@jfmoto

Looking good but why do you run only 2700Mb of ram when you have 3119mb available?


What timing and ram speed do you run?
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post #549 of 560
I see you have no 2500k posted yet, so here's one at 4.8GHz: 100 BCLK, 48 multi, 1.424vcore, 1.075v VCCIO (IMC).

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post #550 of 560
Hey guys. I just got my 875k in the mail today and I figured I'd join this thread. I'm running at 4.07GHz on all four cores at 1.336V under load. I have Intel Speedstep enabled so my clock drops to 1262 when I'm not using the extra power.

Here's my CPU-Z Dump http://valid.canardpc.com/show_oc.php?id=1637908
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