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krisi
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re: AMD 'clocks' FX processor at 8.429-GHz
krisi   9/15/2011 2:43:47 PM
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Every CMOS circuit operates significantly faster when cooled below 77K...what happens if you take any other processor and run it at such temperature? Kris

Neo10
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re: AMD 'clocks' FX processor at 8.429-GHz
Neo10   9/15/2011 6:04:52 AM
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Yeah, I agree the 8.4GHz is impressive even with all that liquid N2/He cooling. It goes to demonstrate that the CPU maintained functional integrity even at those very high speeds without so much as a glitch. Very good, however the cooling requirements make it almost a demo product. If they can get it to run at half the speed with just air cooling then they got a winner on their hands.

krisi
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re: AMD 'clocks' FX processor at 8.429-GHz
krisi   9/14/2011 4:17:52 PM
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2.4kW is more than my whole house...and if it is 2-4x more then using this processor will cost close to a $1 an hour in energy bill alone, pretty pricey...you play 10 hours a day and in one year it will cost you $3000 ;-)...Kris

NimrodO0l1
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re: AMD 'clocks' FX processor at 8.429-GHz
NimrodO0l1   9/14/2011 3:53:39 PM
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Power is probably proportional to clock-rate times Voltage-squared. 1) Note they cannot put too much power in or the local heating will mess things up. 2) A point that used to be made about the super-cooled Crays: Because of the huge temperature difference and assuming a perfect Carnot engine, you need to spend at least 273C/43C (=273-230C) as much energy pumping the system as the CPU uses to keep it cool. So, a factor of 6+ times something like 95W * 4 (8MHz/2MHz) = 2400 Watts. (I skipped the V-squared part, but it might be 2-4x more) A point that used to be made about the Crays: if you look at Power/cpu cycle, it is not that, umm, cool. But, for gamers, if you want to put the maximum hurt on your enemies, every Hertz helps.

krisi
User Rank
CEO
re: AMD 'clocks' FX processor at 8.429-GHz
krisi   9/14/2011 3:25:06 PM
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thank you Peter, good data...I love the point about "power consumption was not measured", really?, AMD went to all these efforts of clocking 8GHz and didn't bother to measure power, hard to believe...Kris

Peter Clarke
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re: AMD 'clocks' FX processor at 8.429-GHz
Peter Clarke   9/14/2011 3:04:33 PM
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@elPresidents AMD came back with this: "The CPU voltage was 2.0125 [volts], the temperature was below -230C, and the power consumption was not measured." -230 deg C is below the freezing point of liquid nitrogen as I remember so it is amazing that the packaging, interconnect and low-k dielectric materials don't just shatter at some point. I guess you take the temperature down as you take the clock frequency up, and very slowly.

krisi
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CEO
re: AMD 'clocks' FX processor at 8.429-GHz
krisi   9/14/2011 1:57:01 PM
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Yes, multicores don't scale linearly...but calling it a hogwash is going way too far...and they run much faster than 1 MHz...Kris

t.alex
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re: AMD 'clocks' FX processor at 8.429-GHz
t.alex   9/14/2011 1:12:51 PM
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How are they cooling down the system?

stixoffire
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re: AMD 'clocks' FX processor at 8.429-GHz
stixoffire   9/14/2011 11:19:40 AM
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I feel the need for speed! Speed does count - multicore hogwash - that came out because they had difficulty getting the accelator pedal further down. Run those 8 cores at 1 Mhz or even 100 cores at 1 Mhz - then compare that to a 3 gigaherz machine with one core and tell me about speed doesn't count. It's all horsepower.

Peter Clarke
User Rank
Blogger
re: AMD 'clocks' FX processor at 8.429-GHz
Peter Clarke   9/14/2011 8:32:30 AM
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@elPresidente Yes it would. That is exactly the sort of information AMD doesn't give out. I will ask though.

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