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post #351 of 560
Quote:
Originally Posted by R00ST3R View Post
Just messing around a bit, failed to get a SS, but was able to submit it at least:
http://valid.canardpc.com/show_oc.php?id=1414204

Gonna shoot for a full 4.7Ghz with screenie after my proc rests for a spat. May go ahead and throw 1.6v at it and just see what it can do.
Holy Hotbox, Batman! Are you sure you really want to fry your chip? My 860 got 4664 with Vcore = 1.396v (see below). I wanted to go higher but I feared for my chip. I for one would not want to kill a perfectly good - and very expensive - cpu just because these 875k's cannot oc as well as an 860. In particular, MY 875k is not in the same league as my 860. I think we have a whole thread full of people who have not been able to OC an 875k as well as an 860. So it's more or less proven. Don't commit chipicide!
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post #352 of 560
Quote:
Originally Posted by ehume View Post
Holy Hotbox, Batman! Are you sure you really want to fry your chip? My 860 got 4664 with Vcore = 1.396v (see below). I wanted to go higher but I feared for my chip. I for one would not want to kill a perfectly good - and very expensive - cpu just because these 875k's cannot oc as well as an 860. In particular, MY 875k is not in the same league as my 860. I think we have a whole thread full of people who have not been able to OC an 875k as well as an 860. So it's more or less proven. Don't commit chipicide!
Come on now, have some faith. This chip is a tank!

It's really not getting that hot with HT off, but it's not heat that kills a proc..it's voltage, I know. Ok, ehume, I'll be gracious and allow this chip to live, for the time being
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post #353 of 560
Thanks ehume. The info you posted on XS made it easy for me to get this new turbo adjustment feature working in the regular 4 core version of RealTemp. The latest version should also restore your multiplier and TDP/TDC settings after a resume from stand by or hibernate mode. Without RealTemp running, some motherboards will dump your multiplier changes and go back and use default values.

When testing on a Core 2 mobile CPU, I found that the core voltage displayed by all software becomes meaningless at idle. You can use the Windows Performance Monitor which is included in Vista and Windows 7 to monitor what percentage of time the CPU spends in the C3 and deeper sleep state. On the Core 2 mobile CPUs, when the CPU goes into C3/C4/C6, the voltage drops down internally to less than what CPU-Z reports and these chips can spend 99% of the time at idle in one of these deep sleep states. I think the Core i is very similar.

At idle, regardless of how a CPU is set up, it tends to spend most of its time in one of these deeper sleep states. For the Core i CPUs when a thread or core enters C6, the voltage drops down to zero.



A low multiplier and low reported voltage at idle looks great but you might find that it doesn't make a lot of difference to your idle power consumption or idle core temperatures because these CPUs are very efficient at idle no matter how you have them set up.
post #354 of 560
Quote:
Originally Posted by unclewebb View Post
Thanks ehume. The info you posted on XS made it easy for me to get this new turbo adjustment feature working in the regular 4 core version of RealTemp. The latest version should also restore your multiplier and TDP/TDC settings after a resume from stand by or hibernate mode. Without RealTemp running, some motherboards will dump your multiplier changes and go back and use default values.

When testing on a Core 2 mobile CPU, I found that the core voltage displayed by all software becomes meaningless at idle. You can use the Windows Performance Monitor which is included in Vista and Windows 7 to monitor what percentage of time the CPU spends in the C3 and deeper sleep state. On the Core 2 mobile CPUs, when the CPU goes into C3/C4/C6, the voltage drops down internally to less than what CPU-Z reports and these chips can spend 99% of the time at idle in one of these deep sleep states. I think the Core i is very similar.

At idle, regardless of how a CPU is set up, it tends to spend most of its time in one of these deeper sleep states. For the Core i CPUs when a thread or core enters C6, the voltage drops down to zero.



A low multiplier and low reported voltage at idle looks great but you might find that it doesn't make a lot of difference to your idle power consumption or idle core temperatures because these CPUs are very efficient at idle no matter how you have them set up.
This is very helpful. Thank you.
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post #355 of 560
Quote:
Originally Posted by ehume View Post
This is very helpful. Thank you.
And thank you for supporting RealTemp. The program is free but when I go to the store looking for some new hardware, that never is.
post #356 of 560
i7 875K at 4053 MHz (bclk = 193, multiplier = 21)
Gigabyte GA-P55A-UD4P v2.0 Bios F13
Vcore = 1.392, Vtt = 1.39, cooling via Thermaltake Frio.

Screenshot: http://www.overclock.net/attachment....1&d=1285906838

It took 65 runs to find the highest clock and correct voltages while not exceeding Tjmax. As you can see, I still hit 94C on two cores during the 6 hour test...

Thanks,

Stephen
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post #357 of 560
Yeah those temps are a bit high, you'll definitely want something better if you're going to keep it at 4GHz
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post #358 of 560
Quote:
Originally Posted by R00ST3R View Post
I'm not having any luck with the CPU skew settings, and being able to lower my vCore for 4.4Ghz runs. I'm not entirely sure of a solid testing methodology concerning CPU skew settings, could use a little insight into the proper way of testing if any is available.

There are also some new Turbo Boost options added with the A71 BIOS, now my CPU won't downclock according to load as it did before.

I just seen they released a new BIOS, A72 to be exact. Here is the description:


Perhaps it will solve it.

I always start to test LinX in diagnostic mode because it does less damage if it freeze at Windows start and after multiple BSOD and it´s also less services that can interupt.

My goal is to have less then +-0,15 in fluctuation between the runs, if it´s more, it´s usually to low vcore or not the right Clock skew, for example, if I use auto clock skew at Bclk 200 the fluctuations is more but if I set the clock skew at delay 100ps for CPU clock skew and normal for PCH clock skew the fluctuations is less.

How this works my varies between different brand, board and chip, for example my Evga P55 FTW do a double post before it starts and that´s Evga´s way to try set the right clock skew automaticly between the CPU and the PCH.

One have do a lot of trail and error with ones gear to find what´s working the best.

Hope it helped some




Quote:
Originally Posted by cory1234 View Post
Added members to the list.

@ehume: Very nice voltage for 4ghz. Does the powering on voltage have something to do with your low VTT voltage? I need more than that for 3.7ghz ;(.
Quote:
Originally Posted by ehume View Post
I have no idea why I can run with such a low Vtt, unless Gigabyte boards have some kind of virtue. After all, a BCLK with Vtt on Auto is a little amazing, no?
Low VTT voltage have very little to do with what CPU frequency one run, it´s more about how high UnCore frequency one run, with a lower Bclk one got lower UnCore and that put less stress on the IMC even though one might run 1600+ on the ram, less stress on the IMC, less voltage to feed it.

If I run Bclk of 133, UnCore 2400, CPU ~4000 and ram at 1600C7 I can run IMC voltage at ~1,15 but when I start to rise the Bclk the UnCore rises to and I have to follow with the voltage even though I try to stay with the same ram frequency, so there´s nothing magic about it, in my opinion it´s pretty normal.



ehume, there´s something that´s not right with your LinX run at Bclk at 167, the fluctuations is way to big, maybe something in the background that interfere or to low vcore.
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post #359 of 560
Quote:
Originally Posted by SecrtAgentMan View Post
Yeah those temps are a bit high, you'll definitely want something better if you're going to keep it at 4GHz
Taking the side cover off of the giant tower I'm using drops the peak temperature by ~ 15C. That tells me I need to get more air in and out of the case. It's a really nice case, and I've only used 3 of the 7 front 5.25" bays. I'll put some fannage there to get air going in, and I'll put a better fan at the back (just behind the Tt heatsink/fans unit) to get the air out.

I think the case is worth keeping and getting to move that hot air out. I bought it about 5 years ago with the intent of building a monster machine. Unfortunately I found I didn't have the time and ended up losing a lot of money here recently selling off the parts I bought then. To give you an idea of how long ago it was I started this project the CPU I bought originally was a Pentium 4 Extreme Edition at 3.4GHz (Northwood, Socket 478 !!!) Sold all of the parts (except the case and PS) on eBay and started over.

Case: http://lian-li.com/v2/tw/product/upl.../V2100-(3).jpg

PS: http://www.pcpower.com/power-supply/...ol-1kw-sr.html

In your experience, if I could drop 15-20C could I get more MHz out of the 875K, or is 4053 MHz a reasonable OC on air? Also, since I have few options for the memory clock (bclk x 6, 8 or 10) is it better to get a little higher memory clock speed, or underclock and drop the latency settings? Letting the Gigabyte P55A-UD4P it seems to do a good job setting the latency automatically based on the bclk (as shown in the CPU-Z SPD tab under Timings Table. IOW, I could go up from 4053 MHz to 4137 MHz and keep the latency at 8-8-8. Any higher and it ups to 9-9-9 using "auto"...

Thanks in advance for any advice,

Stephen
Edited by skfurr - 10/1/10 at 1:40am
    
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post #360 of 560
Quote:
Originally Posted by Ghostleader View Post
I always start to test LinX in diagnostic mode because it does less damage if it freeze at Windows start and after multiple BSOD and it´s also less services that can interupt.

My goal is to have less then +-0,15 in fluctuation between the runs, if it´s more, it´s usually to low vcore or not the right Clock skew, for example, if I use auto clock skew at Bclk 200 the fluctuations is more but if I set the clock skew at delay 100ps for CPU clock skew and normal for PCH clock skew the fluctuations is less.

How this works my varies between different brand, board and chip, for example my Evga P55 FTW do a double post before it starts and that´s Evga´s way to try set the right clock skew automaticly between the CPU and the PCH.

One have do a lot of trail and error with ones gear to find what´s working the best.

Hope it helped some
Yea that does help, thank's. I'm pretty sure I've hit the "sweet spot" with settings below in my sig. Mainly wanting to get the 4.4GHz stabilized a little better (and possibly lower that vCore a bit) for some benchmark runs.



So far this is the best wPrime 32M run I've been able to pull. I like wPrime for it's multithreaded goodness
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