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post #391 of 560
Quote:
Originally Posted by ehume View Post

@Asus P7P55D-E owners: do your boards allow you to adjust the unlocked memory multiplier? I'd like to take my RAM from 1608MHz (12x) to 1876MHz (14x).
I will have to get back to you on a later date about that since I am not going to be around my system for at least a week... as far as I know you cannot tweak the ram multi unless there is an option somewhere deep within the bios settings.
post #392 of 560
@ehume

Since I use Asus Turbo Unlocker I haven´t tried Real Temp the way you do but it´s really interesting to follow your progress, keep it up

I can´t go higher then x30 (Turbo Unlocker 8+) with vcore on auto, if I try x31 (Turbo Unlocker 9+) it isn´t stable, funny thing is that when I have Turbo Unlocker activated vcore do go higher then 1,30 but if I raise the multi to x31 manual the vcore goes higher, hmmm


If i´m not misstaken, Lynnfield doesn´t support more then four memory multiplier, x6, x8, x10 and x12 and I haven´t heard of any unlocked memory multiplier.
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post #393 of 560
I wish I had my PC in front of me (I'm at work right now) so I could take some snapshots of the bios for you guys. As it is I've had to use logmein to get the attached screen shot.

Yes, the Asus P7P55D boards allow you to change the memory multiplier. It's the "DRAM Frequency." If you highlight over that in the bios, you can hit "+" and it will up to the next multi. I'm running my CPU at a 2:10 ratio to get exactly 2000MHz on the RAM while running a 200x20 (200 bclock x 20 CPU multi).

If I want I could run it at 1600MHz instead by just highlighting over the DRAM Frequency and hitting "-". (or hit enter and then it shows a list of available frequencies).

This is not hidden deep in the bios, but is right on the OC screen. Here is a screen shot of the screen where the bios option is located: http://techreport.com/r.x/cheaper-p5.../asus-bios.jpg

It's the 6th line down. And I've checked in CPU-Z and it's running at the speed stated in the bios (see attached image). I was previously running at 21x190, and am now running at 20x200 fully stable (well, 20 passes of LinX anyway).

Note that the temps in the bottom right corner reflect max temps achieved during LinX, not current temps.

Any more questions, just let me know.

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post #394 of 560
Quote:
Originally Posted by Ghostleader View Post
I can´t go higher then x30 (Turbo Unlocker 8+) with vcore on auto, if I try x31 (Turbo Unlocker 9+) it isn´t stable, funny thing is that when I have Turbo Unlocker activated vcore do go higher then 1,30 but if I raise the multi to x31 manual the vcore goes higher, hmmm
With Real Temp the muliplier certainly goes higher. And it's OK on OCCT for a while. But I suspect we won't be getting the great OC's you can get on the 860 and 870. Check out this page.

Quote:
Originally Posted by Ransom View Post
Yes, the Asus P7P55D boards allow you to change the memory multiplier. It's the "DRAM Frequency." If you highlight over that in the bios, you can hit "+" and it will up to the next multi. I'm running my CPU at a 2:10 ratio to get exactly 2000MHz on the RAM while running a 200x20 (200 bclock x 20 CPU multi). . . .

Any more questions, just let me know.
Now we know where on your BIOS you can adjust the mem multiplier. 10x is standard. 12x is standard. Can you make it do 14x? That is my question.
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post #395 of 560
Quote:
Originally Posted by Ghostleader View Post
I haven´t heard of any unlocked memory multiplier.
This. It's one example, but still . . .

And there is this:

Quote:
Unfortunately, this was the last pleasant surprise. Core i7-875K doesn’t offer any additional multipliers for the DDR3 SDRAM frequency, or doesn’t allow changing the Uncore frequency of the processors. It means that the Uncore frequency is strictly connected with the base clock (BCLK) and equals 2.4 GHz at the nominal BCLK of 133 MHz. As for the memory frequency, you can only choose from 800, 1066, 1333 and 1600 MHz if you use default BCLK.
A discouraging note.

Then, from this review, an Intel slide:



Product brief. See page 2, under "Overclocking Enabled."

Confused now? I am.
Edited by ehume - 10/7/10 at 1:33pm
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post #396 of 560
All that intel stuff about 'memory overclock' seems to be aimed at being able to set the mem mult to 12 which yields 1600mhz (off the 133 bclk) that technically is a ddr3 overclock. The main benefit of the 875k is not having to raise bclk to get a decent CPU overclock, and that really is the point intel is making with that ad. Anandtech.com gives this revealing plot on 875K OC power usage:

Anandtech was less than impressed with the 875K; maybe that had a bunk sample: http://www.anandtech.com/show/3742/i...nd-analysed-/8
Edited by *AcidBath* - 10/7/10 at 5:08pm
post #397 of 560
Quote:
Originally Posted by ehume View Post

Confused now? I am.
No, i´m not, it´s pretty clear to my, the only multi that´s "Unlocked" is the bus/core multi with the i7 875k (checkout the pic below), memory multi is the same as the regular i7 8xx.


Why do you guys expect that the 875k should overclock better then both the 860 and 870, it´s nothing more then a 870 with unlocked core multi and it´s a B1 revision core as every other Lynnfield-based processor, it´s not a Extreme Edition with some extra goodies as the i7 9xx have.



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post #398 of 560
Quote:
Originally Posted by Ghostleader View Post
No, i´m not, it´s pretty clear to my, the only multi that´s "Unlocked" is the bus/core multi with the i7 875k (checkout the pic below), memory multi is the same as the regular i7 8xx.


Why do you guys expect that the 875k should overclock better then both the 860 and 870, it´s nothing more then a 870 with unlocked core multi and it´s a B1 revision core as every other Lynnfield-based processor, it´s not a Extreme Edition with some extra goodies as the i7 9xx have.


After reading this thread and some reviews, I never expected this chip to out-OC my 860. I did hope for flexible overclocking which, thanks to unclewebb's Real Temp software, I have gotten.

OTOH, I was also hoping that the RAM multiplier was also unlocked. Apparently that is not the case with Asus boards (or anywhere else, it looks like).
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post #399 of 560
Quote:
Originally Posted by *AcidBath* View Post
All that intel stuff about 'memory overclock' seems to be aimed at being able to set the mem mult to 12 which yields 1600mhz (off the 133 bclk) that technically is a ddr3 overclock. The main benefit of the 875k is not having to raise bclk to get a decent CPU overclock, and that really is the point intel is making with that ad. Anandtech.com gives this revealing plot on 875K OC power usage:

Anandtech was less than impressed with the 875K; maybe that had a bunk sample: http://www.anandtech.com/show/3742/i...nd-analysed-/8
I saw that chart before I got the 875, and it's quite intimidating, but I've no reason to doubt it; at 4053 MHz I'm showing (per HWMonitor pro) that the CPU is pulling ~440w (running LinX.)

That just seems wrong...

But at idle it drops back to 20-40w.

Odd?


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post #400 of 560
First of all hi OCN guys !

i've been reading so much on your forums for couple of years, and now i need some advice for a new setup rig i'm gonna buy real soon.

875k looks nice, but it seems it needs real cooling device, and a capable mobo / ram to outburn it full capacities, this is what i was thinking to buy, for a rig that i'll keep for 5 years minimum, i need your advices and PRO / CONS , if its a good deal or not;

CM HAF X
CM 1000w gold
Asus maximus III extreme (sata 6G + usb 3)
i7 875k
evga EE gtx 470 sli
crucial ssd c300 64gb
wd caviar black 1To x2
gskill extreme3 pi 2x2Go @ 2200mhz x2
H70 corsair watercooling

i'm gonna use this for mainly gaming and some video editing, and been waiting for 5 years to buy such a config, and wont touch a thing in it , till next 5 years
(i'm actually running a64 3500+ , asus a8n-e, 6600gt, 4gb ram :/ )


My main question is :

doest this setup unleash the fullhorse power of this 875k with a good OC ? for gaming purposes, could i possibly get at least 4.4ghz with 4cores and HT on ?

thanks for your opinions, and a big hi from france , sorry for bad spelling
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