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IxTk 'Red Arm' cascade cools a 920 D0 slept in a Classified: 250x21 @1.41vCORE :) - Page 2

post #11 of 21
5/19/09 at 6:47am
Thread Starter 
Thanks mate

I've finally did it... but what a challenge with such unstability! Switched to last beta bios which proved to be a bit more stable at high BCLK (might be a matter of VREF)

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post #12 of 21
5/29/09 at 3:58am
Thread Starter 
With another Cascade... Cold helped for stability but didn't give BCLK improvement.

Latest beta BIOS helps with cold-boot, which has decreased from -40C to about -55C now. This makes reboots a bit less boring.

Furthermore, altought the CPU was cold-bugged at -105C with original BIOS, it now runs less than -110C without problem. Very tempting for the 3-stager...

No need to turn HT off. Amazing motherboard! :

Max bench



Faster time



With 1500ps CPU Skew, it did the trick for suicide.

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post #13 of 21
5/29/09 at 8:37am
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I'm amazed at the dinky voltages it requires for that clock and stability. Pretty amazing how stable it is that close to it's max clock (I'm assuming the "suicide" is it's max).

Nice work.

I don't know what skews the Classified BIOS allows you to adjust, but when you have CPU skew at 1500 do you need to keep IOH skew close to that?
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post #14 of 21
5/29/09 at 3:00pm
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Thanks mate This CPU is really a gem to say the least.

Well actually the BIOS only allows to adjust CPU clock skew so I can't adjust IOH skew like you with the Blood Rage. Did you try playing with skew settings?
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post #15 of 21
5/30/09 at 12:54am
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I need 400ps CPU skew to stay any kind of pi stable past 221 bclock, and it generally does better when the IOH skew is set to match.

This is max validation so far with the G25 BIOS using 500ps skews on water:

Attachment 110274

Increasing QPI latencies to 100-150 helps stability.

I don't know if freezing will help with the new bclock wall on bloodrage until they give another BIOS update allowing PCIe frequency greater than 102. I'll find out after my Duniek pot arrives.

Love your Red Arm.
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post #16 of 21
5/30/09 at 9:53pm
Am i missing the Superpi 1M time?
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post #17 of 21
6/4/09 at 1:00am
Thread Starter 
Quote:
Originally Posted by Patch View Post
I need 400ps CPU skew to stay any kind of pi stable past 221 bclock, and it generally does better when the IOH skew is set to match.

This is max validation so far with the G25 BIOS using 500ps skews on water:

Attachment 110274

Increasing QPI latencies to 100-150 helps stability.

I don't know if freezing will help with the new bclock wall on bloodrage until they give another BIOS update allowing PCIe frequency greater than 102. I'll find out after my Duniek pot arrives.

Love your Red Arm.
Thanks Interesting... 102pci is for sure too low to reach high BCLK; hopefully a BIOS update will improve that.

Well, the guy who was in charge of Quantum Force @Foxconn is a good friend of mine and I know he left the company recently. He told me QF will slowly disappear now... sad.

Quote:
Originally Posted by wierdo124 View Post
Am i missing the Superpi 1M time?
lol I already have this one...


Edited by before - 6/5/09 at 6:53am
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post #18 of 21
6/6/09 at 10:10am
Very nicely done!...
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post #19 of 21
6/6/09 at 8:01pm
Quote:
Originally Posted by ira-k View Post
Very nicely done!...
Indeed
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post #20 of 21
6/8/09 at 9:15am
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Thanks guys!
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