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i7-920 and 2000mhz memory - Page 2

post #11 of 19
Quote:
Originally Posted by hhearld88 View Post
I am running corsair dominators 6gb tri 1600 ram, and when I try to push them too 2000mhz with my i7 920 D0 oc to 4.0ghz (191fsb x 21) and it fails overclock everytime. My ram is stock at 1.65v. I have tried raising it to 1.8v and it still fails. is their something particular i gotta change and or add to get it to work?

Computer specs:
Asus P6X58D-E mobo
i7 920 D0 OCed to 4ghz
6gb tri corsair dominator 1600
XFX 6870 dual fan

any help appreciated
To push 1600MHz rated RAM to 2000MHz you have to loosen the timings a lot, and probably overvolt, even then its still unlikely to clock that high.
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post #12 of 19
Quote:
Originally Posted by hhearld88 View Post
I am running corsair dominators 6gb tri 1600 ram, and when I try to push them too 2000mhz with my i7 920 D0 oc to 4.0ghz (191fsb x 21) and it fails overclock everytime. My ram is stock at 1.65v. I have tried raising it to 1.8v and it still fails. is their something particular i gotta change and or add to get it to work?

Computer specs:
Asus P6X58D-E mobo
i7 920 D0 OCed to 4ghz
6gb tri corsair dominator 1600
XFX 6870 dual fan

any help appreciated
If they are the corsair dominator 1600 cl8 kit they will not get near 2000Mhz unless the timings are so bad it isn't worthwhile. I started off with that kit & upgraded pretty quick, you might be able to get them up around 1800Mhz, think mine topped out around there with 8-8-8 24 timings.

QPI/VTT voltage really is chip dependent, I can run 2000Mhz at 1.44V vtt on my i7 920, another guy may need 1.6V vtt to do the same, all depends on the IMC.
    
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post #13 of 19
oh sorry, i meant to add the link to the ram. http://www.newegg.com/Product/Produc...82E16820145224
I bought these almost a year ago when they were 255$ lol.. so cheap now.
post #14 of 19
Quote:
Originally Posted by hhearld88 View Post
oh sorry, i meant to add the link to the ram. http://www.newegg.com/Product/Produc...82E16820145224
I bought these almost a year ago when they were 255$ lol.. so cheap now.
Same kit i have, I took the heatspreaders off to use other modules in them with a ram cooler, the ICs are d9kpt, micron d9 but not the good ones.
They may do OK for overclocking with higher voltage, I haven't tried it myself yet though.
    
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post #15 of 19
Thread Starter 
So if SandyBridge can run 2000mhz just fine without overclocking, why does it say on newegg that it can only run 1066 and 1333 memory?

Btw, I don't want to overclock the CPU or memory itself, I just want to run my 2000mhz memory at 2000mhz.
post #16 of 19
Quote:
Originally Posted by mrwalker View Post
So if SandyBridge can run 2000mhz just fine without overclocking, why does it say on newegg that it can only run 1066 and 1333 memory?

Btw, I don't want to overclock the CPU or memory itself, I just want to run my 2000mhz memory at 2000mhz.
Intel makes a specification. That is what they publish. Nothing more to it than that.
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post #17 of 19
Quote:
Originally Posted by mrwalker View Post
So if SandyBridge can run 2000mhz just fine without overclocking, why does it say on newegg that it can only run 1066 and 1333 memory?

Btw, I don't want to overclock the CPU or memory itself, I just want to run my 2000mhz memory at 2000mhz.
You'll still have to overclock your CPU a bit even with the highest RAM multiplier. The baseclock needs to be raised and that affects everything, RAM clocks, CPU clocks, Uncore/QPI clocks.
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post #18 of 19
Quote:
Originally Posted by mrwalker View Post
Btw, I don't want to overclock the CPU or memory itself, I just want to run my 2000mhz memory at 2000mhz.
There is a memory multiplier that multiplies your BCLK by a multiple of 2 (2,4,6,8 etc).

This determines what Frequency you can run your RAM at. The RAM Speeds you have available depend on what you have your BCLK set too, so depending on what bclk you have you may not be able to get a certain ram speed (it wont be an available choice in your BIOS).

The System memory multiplier multiply s your BCLK by a multiple of 2. Lets say I have a BCLK of 193. Because of how the memory multiplier works, I won't be able to hit 2000 ( I can get to 2123, but that's running my ram above spec).

However, If I set my BCLK to 200, I can use a *10 multiplier and easily hit 2000mhz.

Because of this relationship, you will probably still have to overclock your CPU's BCLK in order to get your RAM to run at 2000mhz.

Quote:
Let's say you have an i7-920 which has an integrated memory controller and a set of 2000mhz memory. What settings need to be changed in the BIOS and to what they should be set in order for the memory to run at 2000mhz and not the lower frequencies that the i7-920 supports without overclocking?
Settings:

Appropriate Timings and Speeds set in the mem configuration.
Uncore / NB Frequency x2 your RAM Speed (in the case of 2000mhz, a 4ghz nb frequency is required).
BCLK - To let you hit a frequency of 2000mhz.

Also, more QPI/VTT is often required when you run your uncore at a high frequency. A lot of i7's require quite a bit of QPI/VTT to stabilize at 4000mhz of Uncore, which Is why some might tell you that running 2000mhz of ram isn't worth the headache. Depends on you though, and also what uncore your CPU can run at without a preposterous amount of QPI/VTT.

The IMC is different on all of these chips, so your QPI/VTT requirement for a certain uncore frequency may vary from mine.

Hope this helped....
Edited by dTT05 - 2/11/11 at 5:06pm
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post #19 of 19
Thread Starter 
That's what I was looking for. Thanks!
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