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post #21 of 37
Quote:
Originally Posted by Ishinomori View Post

The 4 aren't idle... their off...
It actually shuts down the quad-core and uses only the smaller companion core to run the apps/webpage/video and such...

so why didn't they just make one of the 4 cores be able to run at lower power while the other 3 are "off" (they aren't actually off since you can't have part of a die be 100% off)?

The fifth core is a crutch, if they could have got the high performance cores to run with less power they could have used one of those instead of wasting die space and power on a fifth core, they would have done that.
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post #22 of 37
Thread Starter 
Quote:
Originally Posted by ericeod View Post

Like he said? I think you are on a different page than me... if you notice, I am the one trying to post useful information to help you understand.
Sorry, no offense, but I've done a lot of research on this, and have been following the kal-El articles for some time (now the tegra 3). The core is an identical Cortex A-9 core, just clocked to lower speeds. I'm just waiting/looking forward to some comparisons. Here are some articles and links to help OCN members understand tegra 3 a little better:
First Tegra 3 'Kal-El' Android tablet coming from ZTE
Eric Brown | 2011-09-29
Quote:
The Tegra 3's fifth core is identical to the other four Cortex-A9 cores, but is clocked to a maximum of 500MHz instead of up to 1.5GHz. More importantly, it's designed to execute tasks at low frequency for active standby mode, including music and even video playback, according to Nvidia. The result is said to be a lesser drain on overall battery life.
Nvidia Tegra 3 official: a 1.3GHz quad-core chip with five times the performance of Tegra 2
Vlad Savovon | November 9, 2011
Quote:
Tegra 3 promises to quintuple the performance of Tegra 2 with its four-core Cortex A9 arrangement while also tripling its graphical capabilities with a new 12-core graphics processor. That's a great deal of power for when you need it, but Nvidia has also added a fifth, low-power "companion core," whose role will be to keep things running during standby and other low-intensity modes. That core reaches a maximum speed of 500MHz and can take care of lightweight tasks like audio streaming and some forms of video playback. Anything more demanding than that will kick in the first of the more powerful cores, which can run at speeds of up to 1.4GHz by itself, with dual-core and quad-core modes, each topping out at 1.3GHz, kicking in depending on workload.

contradicts what i thought about it being a lesser core altogether, but supports that it is lesser in that it clocks to .5 GHz
Quote:
Originally Posted by reflex99 View Post

so why didn't they just make one of the 4 cores be able to run at lower power while the other 3 are "off" (they aren't actually off since you can't have part of a die be 100% off)?
The fifth core is a crutch, if they could have got the high performance cores to run with less power they could have used one of those instead of wasting die space and power on a fifth core, they would have done that.

neither of us are cpu designers, the guys who made these have their reasons.
 
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post #23 of 37
All I know is I am getting it. I have 2 tablets now (one is a G Tablet Tegra 2 and the other is an HP Touchpad) and a Kindle DX. So I will be getting rid of the two tablets and replace it with the Transformer prime.
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post #24 of 37
Quote:
Originally Posted by reflex99 View Post

so why didn't they just make one of the 4 cores be able to run at lower power while the other 3 are "off" (they aren't actually off since you can't have part of a die be 100% off)?
The fifth core is a crutch, if they could have got the high performance cores to run with less power they could have used one of those instead of wasting die space and power on a fifth core, they would have done that.

I bet they used low-leakage transistors in the fifth core to lower power consumption and high performance transistors in the other four.
Edit: For a little reading see here. They are using a low-leakage low power process for the fifth core.
Edited by mdatmo - 12/23/11 at 11:05pm
 
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post #25 of 37
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Im excited mainly about superthin notebooks
 
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post #26 of 37
Quote:
Originally Posted by phillyd View Post

contradicts what i thought about it being a lesser core altogether, but supports that it is lesser in that it clocks to .5 GHz
neither of us are cpu designers, the guys who made these have their reasons.

yes, because for whatever reason they couldn't get the four cores to do what they needed, so they added a fifth. I'm not just talking crap here.
Quote:
Originally Posted by ericeod View Post

All I know is I am getting it. I have 2 tablets now (one is a G Tablet Tegra 2 and the other is an HP Touchpad) and a Kindle DX. So I will be getting rid of the two tablets and replace it with the Transformer prime.

I am planning on getting one. My car might need the money though.
Quote:
Originally Posted by mdatmo View Post

I bet they used low-leakage transistors in the fifth core to lower power consumption and high performance transistors in the other four.
Edit: For a little reading see here. They are using a low-leakage low power process for the fifth core.

exactly, they couldn't get the power consumption they wanted out of the four normal cores, and needed this fifth one to patch the issue. It is a crutch, it is a workarround. If they could have done it with only four they would have. As it stands, the fifth core is a massive waste of die space, but is nessecaryuntil they can fix it.
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post #27 of 37
Thread Starter 
Quote:
Originally Posted by reflex99 View Post

yes, because for whatever reason they couldn't get the four cores to do what they needed, so they added a fifth. I'm not just talking crap here.
I am planning on getting one. My car might need the money though.
exactly, they couldn't get the power consumption they wanted out of the four normal cores, and needed this fifth one to patch the issue. It is a crutch, it is a workarround. If they could have done it with only four they would have. As it stands, the fifth core is a massive waste of die space, but is nessecaryuntil they can fix it.

so the only alternative is even worse, therefore it is not a crutch at all.
 
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post #28 of 37
Quote:
Originally Posted by reflex99 View Post

so why didn't they just make one of the 4 cores be able to run at lower power while the other 3 are "off" (they aren't actually off since you can't have part of a die be 100% off)?
The fifth core is a crutch, if they could have got the high performance cores to run with less power they could have used one of those instead of wasting die space and power on a fifth core, they would have done that.

Because then it would be a "Tri-core", with a "4th" low power core to run the apps/video/webpages while the "3 cores" shut down...

Not only does Quad-core sound better, it is also 25% more powerful then your suggestion...
post #29 of 37
Quote:
Originally Posted by phillyd View Post

so the only alternative is even worse, therefore it is not a crutch at all.

it is a crutch until they can make the power efficiency of the main cores the same or better than that of the fifth core.

Once they do that, there will be no reason for the fifth core to exist.

IT is a crutch
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post #30 of 37
Thread Starter 
Quote:
Originally Posted by reflex99 View Post

it is a crutch until they can make the power efficiency of the main cores the same or better than that of the fifth core.
Once they do that, there will be no reason for the fifth core to exist.
IT is a crutch

It would be a crutch to include the feature to underclock the power and speed of 1 core, just for idling, when adding a 5th core is clearly doable.
 
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Ryzen & Vega
(16 items)
 
For Sale: Logitech UE6000 headphones
$75 (USD) or best offer
CPUMotherboardGraphicsRAM
[Intel] i7 3770k Delidded @4.2GHz [ASRock] H77M [XFX] R9 290X 4GB Double Dissipation  [Corsair] Vengeance Pro 2x4GB @2200MHz 
Hard DriveCoolingCoolingCooling
[Crucial] M4 128GBx2 RAID 0 [Danger Den] M6 Nickel  [Alphacool] NexXxoS GPX [Monsoon] 3/8"x5/8" Compressions 
CoolingCoolingCoolingCooling
[Alphacool] NexXxos XT45 360 [Alphacool] NexXxos Monsta 240 [FrozenQ] Liquid Fusion V w/black helix  [Swiftech] MCP655 SE  
CoolingCoolingOSMonitor
[Corsair] SP120 (x10) [Corsair] AF140 (x3) [Microsoft] Windows 10 Pro x64 [ASUS] MG279 Freesync 1440p IPS 
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[Razer] BlackWidow X Tournament Edition w/Vorte... [Corsair] RM750 [Corsair] Obsidian 750D [Razer] Deathadder Elite 
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[Corsair] MM300 Extended (See audio in signature) [Ikea] Tornliden Desk 
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[AMD] R7 1700 [ASUS] Crosshair VI Hero X370 [AMD] Vega Flagship GPU [G.Skill] Trident Z RGB 2x8GB @3000MHz 
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[ASUS] MG279 Freesync 1440p IPS [Razer] BlackWidow X Tournament Edition w/Vorte... [Corsair] RM850x w/custom cables [Phanteks] Enthoo Evolv ATX Tempered Glass 
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[Razer] Deathadder Elite [Corsair] MM300 Extended (See audio in signature) [Ikea] Tornliden Desk 
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