Guide to Overclocking the Core I7 920 to 4.0ghz - Page 22 - Overclock.net

Pillz Here · 3 Weeks Ago

This guide is great. The only thing I don't really understand is the memory multipliers (6x, 8x etc.). In my bios there are no memory multipliers...for DRAM frequencies you just select the frequency you want to run your memory at (14,xx MHz for mine with a 21x cpu multiplier). Same with the UCLK which you just double the DRAM frequency so mine ends up being 29,xx MHz, can't remember the exact values.

Also my ram has an XMP profile of 1600MHz with 1.5 DRAM volts, but I can't manually set it to that option with the 21x cpu multiplier, it isn't an option. I have my DRAM bus voltage set at 1.64 but would it be alright to use the XMP profile considering it runs at a higher frequency with lower voltage or would that make my OC unstable?

vinzend · 2 Weeks Ago

what software to read all the voltages? like qpi vtt pll etc?

eflyguy · 2 Weeks Ago

Nothing in the OS can read all the voltages, only core related ones show up.

You can set them in BIOS, however..
..a

Stance · 2 Weeks Ago

Quote:

Originally Posted by lucky-luk

I was trying to reach stability on 19x211 with no success.
I increased the vcore, qpi, pll, ioh, ich, trying this voltages together and separately. I have tried even to decrease the qpi and there is no stability

.

Results with above voltages:

21x191 - Rock stable
20x200 - no stability
19x211 - no stability

Please guys have a look on my voltages and give me some tips?
Maybe there is someone who have 19x211 stable and can share the setup with me please?

By the way for first stability test I'm using linx because in case of instability it's "freezes" (blocking computer and I need to press reset buton) after few minutes, when i'm passed linx for 50 times then there is prime95 small ftt 24h and large ftt for 24h.

PS
Sorry for my English

I'm on the same boat as you, trying to reach 200+ while at 191 right now. I gave it a shot trying out alot of different voltage settings, without success. I don't quite know what the maximum recommended/specified voltages are though, so it may just be a case of having to raise them far more than I tried.

Your temps are indeed running very high with the watercooling, should check that block asap.

I replaced the stock fan on my Mugen 2 by a 120mm SilverStone FM121 the other day, and re-applied thermal paste (OCZ Freeze) using the thin line method this time. I was amazed by the results, a full 9 ºC down with the hottest core now maxing out at 72 ºC.

vinzend · 2 Weeks Ago

hi, i put bclk 215 but my ram can't take 8x215 even tho the timings were cl9..
vdimm 1.65v .. any idea how? OCZ Platinum PC12800..
so shameful to having ram freq below 1600mhz..

Dragonne · 2 Weeks Ago

Quote:

Originally Posted by Dragonne

Any advice on this?

Well, in lieu of any responses in this thread, I had to go ahead and experiment (damn you all for making me think for myself

).

Just to refresh, I used the 'Quick and Dirty' option from the first post to get my D0 running happily at 4.0GHz (21x190). Although this ran a 24 hour torture test (balanced with 8 threads) without any sign of an error, my temps were somewhat high and this concerned me (temp peaked at about 87 degrees during the heat of the day - it's summer here in sunny South Africa), especially as I run a watercooled rig. So I wanted to figure out the best way to bring the temps down.

So, what I did was to lower the Vcore to 1.25 (from 1.275), and switch off Hyperthreading, in order to see what a difference it would make.

Wow, was that a good thing to do!! Max Load temps droppped to about 72degrees after a short run (~ 1hour). So I decided to go a bit further. Dropped to 1.23 - all was fine. Then tried 1.21, but the PC bluescreened trying to load Windows!! So back to 1.23, and ran another torture test for 8 hours. Max temp was 68!

I'm super chuffed at this stage, I reckon I could push this CPU another couple of hundred MHz with a little effort and a little more juice. But, 4GHz is plenty for me right now, that's all the power I need.

A couple of last questions though:

1. I kinda feel like I'm giving something up by not having HT enabled. Is there any real world performance difference by doing this, or am I just pining for the 8 threads that I used to see on the performance monitor?

2. From the initial 'Quick and dirty' post, are there any other voltages that I should try dropping? And if so, by how much should I decrement at a time. My mobo doesn't have the usual (for me) drop down list for voltages, you type them in manually into the BIOS, so I have no idea how much a normal 'increment' would be with each of these.

Any further ideas gratefully received

drjoey1500 · 2 Weeks Ago

Quote:

Originally Posted by Dragonne

Well, in lieu of any responses in this thread, I had to go ahead and experiment (damn you all for making me think for myself

).

Just to refresh, I used the 'Quick and Dirty' option from the first post to get my D0 running happily at 4.0GHz (21x190). Although this ran a 24 hour torture test (balanced with 8 threads) without any sign of an error, my temps were somewhat high and this concerned me (temp peaked at about 87 degrees during the heat of the day - it's summer here in sunny South Africa), especially as I run a watercooled rig. So I wanted to figure out the best way to bring the temps down.

So, what I did was to lower the Vcore to 1.25 (from 1.275), and switch off Hyperthreading, in order to see what a difference it would make.

Wow, was that a good thing to do!! Max Load temps droppped to about 72degrees after a short run (~ 1hour). So I decided to go a bit further. Dropped to 1.23 - all was fine. Then tried 1.21, but the PC bluescreened trying to load Windows!! So back to 1.23, and ran another torture test for 8 hours. Max temp was 68!

I'm super chuffed at this stage, I reckon I could push this CPU another couple of hundred MHz with a little effort and a little more juice. But, 4GHz is plenty for me right now, that's all the power I need.

A couple of last questions though:

1. I kinda feel like I'm giving something up by not having HT enabled. Is there any real world performance difference by doing this, or am I just pining for the 8 threads that I used to see on the performance monitor?

2. From the initial 'Quick and dirty' post, are there any other voltages that I should try dropping? And if so, by how much should I decrement at a time. My mobo doesn't have the usual (for me) drop down list for voltages, you type them in manually into the BIOS, so I have no idea how much a normal 'increment' would be with each of these.

Any further ideas gratefully received

I'd just try to get stable settings for both HT on and HT off. Then you can decide if you want it on or not later and still have a stable system. With HT off you can usually get it stable with less voltage. HT does add a lot of heat.

You should also try decreasing the VTT and the IOH.
My bios has vtt in increments of +20mV, vcore +10mV, and IOH +20mV (hope this helps)

oxymorosis · 2 Weeks Ago

Forgot to say cheers for the guide. Although upping ICH voltage seems kinda unnecessary it saved me much work.

hypertripo · 2 Weeks Ago

Nice + rep your the best my i7 is now at 3.8 Ghz! stable

FSF-Foxhound · 2 Weeks Ago

Quote:

Originally Posted by Pillz Here

This guide is great. The only thing I don't really understand is the memory multipliers (6x, 8x etc.). In my bios there are no memory multipliers...for DRAM frequencies you just select the frequency you want to run your memory at (14,xx MHz for mine with a 21x cpu multiplier). Same with the UCLK which you just double the DRAM frequency so mine ends up being 29,xx MHz, can't remember the exact values.

Also my ram has an XMP profile of 1600MHz with 1.5 DRAM volts, but I can't manually set it to that option with the 21x cpu multiplier, it isn't an option. I have my DRAM bus voltage set at 1.64 but would it be alright to use the XMP profile considering it runs at a higher frequency with lower voltage or would that make my OC unstable?

each board is different. some may say memory multipliers some may say the ratios.

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Guide to Overclocking the Core I7 920 to 4.0ghz

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