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post #381 of 560
@skfurr

You´re welcome

What I thought, interesting to see what voltage you need to get it stable when you´re done, I quess it´s tedious to run test with that amout of ram, I remember when I ran some 4x2 with LinX, so I can imagine how it can be with 4x4.


I wonder, have you tried to run some Bclk 200 with 4x4Gb?


What kind of work do you do to utilize that amout of ram, virtualization maybe?
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post #382 of 560
Quote:
Originally Posted by Ghostleader View Post
@skfurr

You´re welcome

What I thought, interesting to see what voltage you need to get it stable when you´re done, I quess it´s tedious to run test with that amout of ram, I remember when I ran some 4x2 with LinX, so I can imagine how it can be with 4x4.


I wonder, have you tried to run some Bclk 200 with 4x4Gb?


What kind of work do you do to utilize that amout of ram, virtualization maybe?
I tried bclk 200 but the stability just wasn't there. Maybe I needed even more Vtt?

Yeah, with 4x4 it's a little over 6 hours to run LinX with "all" memory and 20 passes. Kind of makes it a one or two run a day task.

I'll keep at it, but my first pass overnight with Vtt dropped from 1.37 to 1.35 gave me a beautiful BSoD when I woke up this morning. Hmmm...

What's the relationship between QPI/Vtt and bclk? If I run a lower bclk and a higher multiplier would that lower the pressure on needing such a high QPI/Vtt?

Thanks again!
    
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post #383 of 560
@skfurr

Sorry to hear about the "beautiful BSoD", I quess you need at least 1,37 then, with the current setup.


The i7 875k have locked multiplier for the UnCore frequency and two for the QPI, higher QPI frequency is usally not a problem until one pass Bclk ~225, then one might get degrading 3D performance.

The default UnCore frequency is 2400MHz and once one start to rise the Bclk, the UnCore and ram frequency start to increase and one have to increase the IMC voltage to substain stability and if one add ram, one have to even further increase IMC voltage to substain stability.

But if one keep the default Bclk of 133 and increase the multiplier instead, the UnCore stay at default and let say one keep ram frequency at 1333 with 2x2Gb, one shouldn´t need to increase IMC voltage from default value.

In you case you might need to increase IMC voltage just a small amount, probably not more then 1,20, try it and report back if you like.


What about performance decrease from your current setup to my example above if you keep the cpu frequency the same, it should be minor in most real time applications, if you bench, it should be a bigger different though.

Hope it can help some
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post #384 of 560
Hey guys, I just picked up 8GB of A-Data 2000MHz ram from Microcenter (got 2 sets of 4GB for $105 each). I plan to head home and see what improvements I get over my current Corsair XMS3 1600MHz ram.

Here are the links to what I actually have:

Currently installed XMS3:
http://www.newegg.com/Product/Produc...-260-_-Product

New stuff I'm putting in tonight:
http://www.newegg.com/Product/Produc...82E16820211463

I will post back to let you know what I find out. Plan is to up the multiplier so it runs at the higher rated 2000MHz, and run wPrime to see if there is an improvement. Then down clock to 1600MHz and tighten the timings to see what wPrime does then. I also plan to see if I can get a higher stable OC, as I know that ram really plays a factor in overclocking these chips. (I had some other ram that wouldn't let me get to 4GHz with any range of decent voltage... with my current sets I can do it fairly easily... now we'll see what happens with these new sets).

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post #385 of 560
Quote:
Originally Posted by Ransom View Post
Hey guys, I just picked up 8GB of A-Data 2000MHz ram from Microcenter (got 2 sets of 4GB for $105 each). I plan to head home and see what improvements I get over my current Corsair XMS3 1600MHz ram.

Here are the links to what I actually have:

Currently installed XMS3:
http://www.newegg.com/Product/Produc...-260-_-Product

New stuff I'm putting in tonight:
http://www.newegg.com/Product/Produc...82E16820211463

I will post back to let you know what I find out. Plan is to up the multiplier so it runs at the higher rated 2000MHz, and run wPrime to see if there is an improvement. Then down clock to 1600MHz and tighten the timings to see what wPrime does then. I also plan to see if I can get a higher stable OC, as I know that ram really plays a factor in overclocking these chips. (I had some other ram that wouldn't let me get to 4GHz with any range of decent voltage... with my current sets I can do it fairly easily... now we'll see what happens with these new sets).

Ransom
You actually need to raise the BCLK, not the multiplier in order to run your RAM at 2000MhZ. Try using MaxxMem to bench your new modules also .
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post #386 of 560
Quote:
Originally Posted by R00ST3R View Post
You actually need to raise the BCLK, not the multiplier in order to run your RAM at 2000MhZ. Try using MaxxMem to bench your new modules also .

But if he already run Bclk of 200 , then he can raise the ram multi to match 2000MHz.
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post #387 of 560
Quote:
Originally Posted by R00ST3R View Post
You actually need to raise the BCLK, not the multiplier in order to run your RAM at 2000MhZ. Try using MaxxMem to bench your new modules also .
Thanks for the correction, but I meant the ram multiplier, not the CPU multipler. I should have made myself more clear. For example, right now it's running at approx 1580MHz. If I up the Ram 1 setting, it runs at approx 1920MHz. This is the multiplier I meant. I probably didn't use the proper terminology for it, that's what I get for not proof reading my post.

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post #388 of 560
Quote:
Originally Posted by Ghostleader View Post
But if he already run Bclk of 200 , then he can raise the ram multi to match 2000MHz.
You are correct. My current Bclock is set at 190 (CPU multi is 21).

Thus giving me 4GHz in Windows.

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post #389 of 560
Quote:
Originally Posted by Ransom View Post
Thanks for the correction, but I meant the ram multiplier, not the CPU multipler. I should have made myself more clear. For example, right now it's running at approx 1580MHz. If I up the Ram 1 setting, it runs at approx 1920MHz. This is the multiplier I meant. I probably didn't use the proper terminology for it, that's what I get for not proof reading my post.

Ransom
Alright, we are on the same page I see .
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post #390 of 560
Well, I tried to push up to the next level. My current OC is a dynamic, using Real Temp to allow my cpu multi to range from 9x to 30x (Turbo Boost) with a BCLK of 134MHz, giving me a cpu speed of 1206 to 4020MHz. Because the BCLK is normal, this OC is OCCT/Linpack stable with Vtt (IMC), PCH and PLL all set to Normal voltage - i.e., they don't vary as they might if set to Auto. Vdimm (DRAM) is set to 1.62v, runs at 1.616v. Vcore is set to Normal + 0.025v, and runs up to 1.344v on load. My current heatsink is not as good as the D14 I used previously, but the system with the above settings runs cooler than my i7 860 did at Vcore set to 1.31250v (ran 1.312 - 1.328v on load), Vtt/IMC at 1.19v.

So, with some cooling headroom, I thought, why not move up a notch and get some 4.1GHz action? So I reduced BCLK to 133MHz and increased the TB to 31x for all cores. This would give me 4123MHz. I increased the Vcore setting two notches to Normal + 0.0375v. On load, Vcore went to 1.360v. Max temp hit 79c. Then BSOD = 0x00000101, which means insufficient Vcore.

I suppose I could reduce BCLK further and increase the TB, but I think I have reached a practical max clock . . . until I get my D14 back in operation (missing a part just now). I'm wondering if I could reduce Vtt to below normal and literally take some of the heat off the cpu with lower BCLK's.

@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).
Edited by ehume - 10/6/10 at 7:21pm
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