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post #11 of 17
did you have it stable at 2.900? what vcore were you running there? im at 2.85 (9.5x300) at 1.35 vcore.
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post #12 of 17
Quote:
Originally Posted by t4ct1c47 View Post
If your motherboard is undervolting your CPU vCore then simply raise it even further to compensate. Obviously be sure to use monitoring software, or at least the motherboard's built in volt monitor, to confirm the actual vCore. Either way, 1.3v CPU vCore is no way near enough for the overclock you have. You need to raise your CPU vCore to at least 1.5v.

Quote:
Originally Posted by xthedrumzx View Post
yeah. move your vcore way up. that hardware will not support a 2.9gHz OC if you are only running 1.3v.

Thats just plain bad advice comming fron Intel users....

The Brisbane line of chips will clock higher on alot less voltage... if he can make it to 2900 on 1.296v it will make 3.0ghz on about 1.35v

Most ALL Brisbanes will hit 3G's on stock voltage....it's NOT the cpu when you need to feed it huge amounts of voltage to get it to budge it's the ram being set incorrectly...

this has been posted many times about Brisbane CPU's


Leave the voltage at 1.35v and start messsing with the ram and test it with Orthos till you get it stable... it will work you will see...

I am at 2885mhz with 1.25v right now...just tweaking the ram is all it takes...
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post #13 of 17
I hope this doesn't sound flameish, as it isn't intended to be. I just thought I'd explain why I made the recommendation about the vCore being raised.

Quote:
Originally Posted by dr_bowtie View Post
Thats just plain bad advice comming fron Intel users....

The Brisbane line of chips will clock higher on alot less voltage... if he can make it to 2900 on 1.296v it will make 3.0ghz on about 1.35v
I would consider myself knowledgeable enough with regards to clocking both Intel and AMD CPU's. The reason I recommended raiseing the vCore to 1.5v is because the opening poster didn't mention if he was stable at lower clocks or if he'd done any prior stress testing. Ontop of that, I did a little research to boot. Judgeing by the earlier CPU-Z screenie, the RAM isn't being stressed beyond its default speed or volts either.

I never post information that is based purely on the opinions of other forum members. I always research from various other sources to verify comments, in this case reviews of the opening posters CPU and motherboard. There are plent that are readily available from credible sites if a person takes the time to use Google.

Quote:
"We worked to reveal the maximum clock speed this processor could work at by raising the Vcore from the nominal 1.25V to 1.5V."

Gavrichenkov, I., 2007, Two Cores at a Low Cost: AMD Athlon 64 X2 3600+ CPU Review
http://www.xbitlabs.com/articles/cpu...0_3.html#sect0
Accessed: 08/06/2007
With regards to other Brisbanes attaining high FSB with low vCore, this will depend on the batch of CPU's aswell. Not every CPU clocks the same. There are many members with E6600's who are able to run at 3.6Ghz with much lower vCores than mine (1.45v vs 1.55v).
post #14 of 17
No it's not flamish...and NOT intended to be...

I am trying to state that Brisbane core CPU's arent like regular CPU's...the fact that they have 1/2 multipliers make life a little harder when it comes to clocking...

this really confuses the whole memory line...those of us that have spent time playing with Brisbanes know that they WILL clock on very little vcore...personal experiance included...

You DO NOT need high vcore for decent clocks if you set the ram correctly...

when the ram isnt set correctly it makes the memory controller work very hard (and it's working hard anyhow being on a half multy) and will take huge amounts of vcore to get it stable at high clocks...

This is one core of CPU where you really need to work with the ram as you clock it up or it just will refuse to clock in some cases...

Personally I can get mine to pass memtest with flying colors on stock timings but would fail Orthos in seconds...vcore would fix it (1.475v or more) but once I found that setting certain settings would allow for higher clocks on alot less voltage...

I went from 1.475 all the way down to 1.25v just by setting trfc... and a few others... once board makers get the bios's really fine tuned for Brisbanes it prolly will get easier...
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post #15 of 17
I'm very new to all of this but I'm building a T550/3600+ computer tomorrow. Are there any tips on how to get the memory set up? The upping the CPU side and adding vcore is intuitive to me but the memory timings etc is a bit mysterious.
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post #16 of 17
the 550 if set on auto for your ram timings will either set it with tight timinings(4-3-3-8 1 T) or the stock timings for your ram.

To get higher clocks you may have to change the DDR2 timings(trfc?*) from 75 to a higher number. im not gonna say the number because i cant remember exactly, so guessing would just end up hurting you, so ill wait for someone who know more about it to chime in.

I havent touched my ddr2 timings yet, but will eventually so i can hit 3.0ghz

Check out this thread if you havent already http://www.overclock.net/amd-cpus/18...oc-thread.html
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post #17 of 17
Thread Starter 
orthos failed after running it for 5 hours..
what can i do??
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