I saw this Lemon Pi crowdfunding campaign on https://www.indiegogo.com/projects/lemon…en-source-board .I want to know what's the differences of power consumption and computing capacity between ARM A7 and A9? It seems that this board also has 40-pin connect.So can the expansion board I am using on RPi2 work with this clone board directly? Thanks for reply.
http://igg.me/at/lemonpi
$35 Raspberry Pi clone board with Quad-core A9 and PowerVR544 GPU?
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stephanieraspi -
28. Mai 2015 um 19:11 -
Erledigt
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$35 Raspberry Pi clone board with Quad-core A9 and PowerVR544 GPU?? Schau mal ob du hier fündig wirst!
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Hm i wonder why you dont just read the Text of your URL :s Your last Quest is answered there
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Look at this:
Zitat
Related Topics
ARM cortex a7 vs ARM cortex a9 vs ARM cortex a15. what are Major differences and which to prefer if you need more battery life?1 Answer
Quora UserQuora User, Signal Integrity Engineer at Freescale
37 upvotes by John O'Hollaren, Manan Chugh, Abhishek Jain, (more)
1. A7 is the best if you need more battery life. A7 cores are simple and efficient, in order 8 stage pipeline is there in A7 arm cores.2. A9 cores are lil complex and perform better than A7 but their power consumption is also high as compared to A7. A9 cores have OoO 9-11 stage pipeline,
3. A15 cores are high performance cores(made for servers initially but because A9 performance was limited and A12 was not there till now so A15 are coming in phones these days.) A15 performance is the best in ARMv7 but you don't need high performance everytime that's why they are coming in bigLITTLE config with A7 cores.
In big LITTLE config when you run games and movies , A15 cores handle the operations and when your phone is idle and is used only for calling messaging then A7 cores are working which are efficient thus provides good battery backup.
Till now there was a (kind of) huge gap between A9 and A15 so something in between was missing, ARM realised this and introduced A12 cores recently.
Which are Out of Order processors with 12 stage pipeline.
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