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Any gain to be had over 3000mhz NB?

post #1 of 36
Thread Starter 
I have recently zeroed in on a stable 3000mhz NB oc, with a lot more headroom voltage/temp wise. I haven't tried to go further yet, but I was wondering if I will still see performance increases, or if 3000 is the sweet spot. I mostly see people stopping at 3000.

Just wondering if anyone could clarify for me. Thanks!
Edited by xstarscream - 3/3/12 at 9:11am
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post #2 of 36
Yes there is more performance above 3000MHz. Debatable whether or not it would be something you could actually feel, I guess that depends on how your setup was performing before you raise the freq. What I mean is, I can easily notice/feel the change after maybe 3-4 changes (not always higher, depends on the entire OC settings). Seems like every third change is a keeper with how I OC. It's that sweet spot you mentioned, everyone's is different, and you'll feel them as they come. Just don't expect this to happen every time lol.

I have my 24/7 4222MHz OC listed in my sig, and as an example of the performance gains here is a few snips to demonstrate the gains (depending on the entire OC). Look at the MaxxMem "Reached Memory Score" in each snip, than compare the CPU and NB freqs to see what I'm trying to explain.

First is a 4222MHz with a 3070MHz NB freq you'll have to read the CPU freq etc on MaxxMem as I run C/Q

272

This is a 4174MHz with a 3210MHz NB freq. Please notice the actual Dram timings have not been changed.

582

This will show you the actual gains for memory. Does the 3210 NB freq make diff? Heck yes! Not everyone can get this high, depends on YOUR chip/mobo and your OC.

I might have a few Cinebench etc around if you like I'll take a look.

Hope this answer at least part of your question. wink.gif
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post #3 of 36
Thread Starter 
Quote:
Originally Posted by The Sandman View Post

Yes there is more performance above 3000MHz. Debatable whether or not it would be something you could actually feel, I guess that depends on how your setup was performing before you raise the freq. What I mean is, I can easily notice/feel the change after maybe 3-4 changes (not always higher, depends on the entire OC settings). Seems like every third change is a keeper with how I OC. It's that sweet spot you mentioned, everyone's is different, and you'll feel them as they come. Just don't expect this to happen every time lol.
I have my 24/7 4222MHz OC listed in my sig, and as an example of the performance gains here is a few snips to demonstrate the gains (depending on the entire OC). Look at the MaxxMem "Reached Memory Score" in each snip, than compare the CPU and NB freqs to see what I'm trying to explain.
First is a 4222MHz with a 3070MHz NB freq you'll have to read the CPU freq etc on MaxxMem as I run C/Q
272
This is a 4174MHz with a 3210MHz NB freq. Please notice the actual Dram timings have not been changed.
582
This will show you the actual gains for memory. Does the 3210 NB freq make diff? Heck yes! Not everyone can get this high, depends on YOUR chip/mobo and your OC.
I might have a few Cinebench etc around if you like I'll take a look.
Hope this answer at least part of your question. wink.gif

Thank you for the information. Did you have to downclock your CPU to get the higher NB freq?

I jumped the gun a little on saying it was 100% stable. I know my CPU is stable or good enough (16 hours with prime without crashing/errors, I just game) but after Priming for 4 hours after getting my NB to 3000mhz, my fourth core got a rounding error and that worker stopped, but prime kept working with the other cores. Do I solve this problem by upping the voltage to the CPU or the CPU/NB voltage? Again, CPU OC should be stable or close to it with 16 hours on prime without a hiccup.
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post #4 of 36
I found a thread a while back that helped me out with NB frequencies... Here's the link

http://www.overclockers.com/the-importance-of-northbridge-overclocking-with-the-phenom-ii/

Seems 2600 mhz is the best frequency for Phenom II
Edited by Zethlis - 2/29/12 at 5:59pm
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post #5 of 36
Quote:
Originally Posted by xstarscream View Post

Thank you for the information. Did you have to downclock your CPU to get the higher NB freq?
I jumped the gun a little on saying it was 100% stable. I know my CPU is stable or good enough (16 hours with prime without crashing/errors, I just game) but after Priming for 4 hours after getting my NB to 3000mhz, my fourth core got a rounding error and that worker stopped, but prime kept working with the other cores. Do I solve this problem by upping the voltage to the CPU or the CPU/NB voltage? Again, CPU OC should be stable or close to it with 16 hours on prime without a hiccup.

When running Prime95 and you receive the dreaded "Worker Has Failed" error it's usually a lack of Dram voltage or CPU/NB voltage. It's not uncommon with AMD platform to have run above the manufactures specified voltage, many times even at stock timings. Usually .05 to .1v will do the job depending on your setup. I'd need to know where your dram voltage is currently set to help any further. If you did not know, the max CPU/NB voltage with the Thurban is 1.5v.

I did down clock slightly to make it easier with less effort just to see how it would perform. If you look at the snip again I raised the Ref Clock from 254MHz to 320MHz for the 4174 OC. I was playing with the ref clock at the time investigating a new path for my next OC.

Edit: I just noticed your cooler. What temps are you seeing with 1.45v?
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post #6 of 36
Quote:
Originally Posted by The Sandman View Post

When running Prime95 and you receive the dreaded "Worker Has Failed" error it's usually a lack of Dram voltage or CPU/NB voltage.

Sorry, not to derail the OP but,

Really? I had my chip running at 4.3 and kept getting an error saying it expected a .5 but received a .4 instead and the working stopped. So it most likely was my ram? Mine runs at 1.5v and my cpu/nb voltage is a 1.275 I believe
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post #7 of 36
Thread Starter 
Quote:
Originally Posted by The Sandman View Post

When running Prime95 and you receive the dreaded "Worker Has Failed" error it's usually a lack of Dram voltage or CPU/NB voltage. It's not uncommon with AMD platform to have run above the manufactures specified voltage, many times even at stock timings. Usually .05 to .1v will do the job depending on your setup. I'd need to know where your dram voltage is currently set to help any further. If you did not know, the max CPU/NB voltage with the Thurban is 1.5v.
I did down clock slightly to make it easier with less effort just to see how it would perform. If you look at the snip again I raised the Ref Clock from 254MHz to 320MHz for the 4174 OC. I was playing with the ref clock at the time investigating a new path for my next OC.
Edit: I just noticed your cooler. What temps are you seeing with 1.45v?

My ram is at stock timings, 1600mhz and 1.5v on it. I am at 1.35v on the CPU/NB.

So I should up the voltage on my ram and not the CPU/NB to fix this issue? Might be both?

The CPU voltage hasn't updated yet, it's actually at 1.47v and can keep it around 49c while priming.
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post #8 of 36
Quote:
Originally Posted by Marshmellow17 View Post

Sorry, not to derail the OP but,
Really? I had my chip running at 4.3 and kept getting an error saying it expected a .5 but received a .4 instead and the working stopped. So it most likely was my ram? Mine runs at 1.5v and my cpu/nb voltage is a 1.275 I believe

I would try raising the Dram voltage as mentioned. If 1.5v is stock than try a small bump. It might take a couple small bumps before you see a difference in failure time. I find anywhere from .05 to .1 additional voltage usually does the job. I'm very surprised how fortunate you've been to be able and stay at stock Dram voltage at 4.3. Nice!
Don't be afraid to use a little trial and error to break down the wall when it comes around. I have found my setup does require this additional voltage with most anything other than stock settings all the way around. I usually try a little dram voltage first, if there's no improvement after a reasonable increase than I go for CPU/NB voltage increase. Most recently I've learned a boost to the HT and NB voltages made a nice change in instability, but that was with the Ref Clock pushing 320MHz.
Quote:
Originally Posted by xstarscream View Post

My ram is at stock timings, 1600mhz and 1.5v on it. I am at 1.35v on the CPU/NB.
So I should up the voltage on my ram and not the CPU/NB to fix this issue? Might be both?
The CPU voltage hasn't updated yet, it's actually at 1.47v and can keep it around 49c while priming.

As mentioned above, if you're currently running stock Dram voltage try raising that first. I just received a set Ripjaw X 2x4GB 17000 (2133MHz) 9-11-9-28-1T which is rated at 1.65v dram voltage. As soon as I apply even a 4139MHz CPU OC I have to run it at 1.75v. It'll take even more when I get time to start tightening these bad boys. The Dram setup listed in my sig runs at 1.68v and it's rated at 1.35v stock. Edit: Updated Dram specs 3-2-12. It use to read GSkill Eco's 2 x 2GB running at 1704MHz 6-8-6-20-24-1T with 1.68v.

It's also very possible it'll take a little of both yes. You can test OC'd ram with LinX (25-50 runs on maximum) and SuperPi using the 32M setting prior to running Prime95. It'll help save some testing time. Let me know how you make out!

Both of you feel free to PM me if I happen to miss a post on here.
Edited by The Sandman - 3/2/12 at 2:27pm
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post #9 of 36
Quote:
Originally Posted by xstarscream View Post

Thank you for the information. Did you have to downclock your CPU to get the higher NB freq?
I jumped the gun a little on saying it was 100% stable. I know my CPU is stable or good enough (16 hours with prime without crashing/errors, I just game) but after Priming for 4 hours after getting my NB to 3000mhz, my fourth core got a rounding error and that worker stopped, but prime kept working with the other cores. Do I solve this problem by upping the voltage to the CPU or the CPU/NB voltage? Again, CPU OC should be stable or close to it with 16 hours on prime without a hiccup.

What voltage do you have the CPUNB set too? On my 960t, 3ghz is possible on 1.35v. If I unlock the other 2 cores, well, it needs 1.525vs...and well, I don't like running it that high. I can do 3.2 (1.425) and 3.4 on 1.525. Really though, the gains are minimal, and not worth the extra effort and heat. From my benchmarks, on my system, the best throughput is up to 2.8ghz. Anything higher than that, and the price vs performance just isn't there.
Quote:
Originally Posted by Marshmellow17 View Post

Sorry, not to derail the OP but,
Really? I had my chip running at 4.3 and kept getting an error saying it expected a .5 but received a .4 instead and the working stopped. So it most likely was my ram? Mine runs at 1.5v and my cpu/nb voltage is a 1.275 I believe

Yeah, increasing the RAM voltage can help stabilize a CPU overclock, as can a slight bump in the Northbridge core. Keep in mind, the CPU is now communicating with these devices much faster, and as such, it may require a strong signal from the other components to work correctly.

Case and point: my system requires 1.9vs for my ddr2 1066 ram @ 5-5-5-15-23 up to 4.2ghz (can run prime blend, custom 90% ram) for 24 hours and intel burn in for 300+ passes. It's pretty much mathematically sound. Once I increase it to 4.3ghz, I need to increase the dram to 2.1vs in order to maintain that same level of stability.
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post #10 of 36
Quote:
Originally Posted by The Sandman View Post

I would try raising the Dram voltage as mentioned. If 1.5v is stock than try a small bump. It might take a couple small bumps before you see a difference in failure time. I find anywhere from .05 to .1 additional voltage usually does the job. I'm very surprised how fortunate you've been to be able and stay at stock Dram voltage at 4.3. Nice!
Don't be afraid to use a little trial and error to break down the wall when it comes around. I have found my setup does require this additional voltage with most anything other than stock settings all the way around. I usually try a little dram voltage first, if there's no improvement after a reasonable increase than I go for CPU/NB voltage increase. Most recently I've learned a boost to the HT and NB voltages made a nice change in instability, but that was with the Ref Clock pushing 320MHz.
As mentioned above, if you're currently running stock Dram voltage try raising that first. I just received a set Ripjaw X 2x4GB 17000 (2133MHz) 9-11-9-28-1T which is rated at 1.65v dram voltage. As soon as I apply even a 4139MHz CPU OC I have to run it at 1.75v. It'll take even more when I get time to start tightening these bad boys. The Dram setup listed in my sig runs at 1.68v and it's rated at 1.35v stock.
It's also very possible it'll take a little of both yes. You can test OC'd ram with LinX (25-50 runs on maximum) and SuperPi using the 32M setting prior to running Prime95. It'll help save some testing time. Let me know how you make out!
Both of you feel free to PM me if I happen to miss a post on here.

This was my experience too, even on a black edition processor.
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