Discussion

RAM Bus Frequency

6 2017
Is the RAM frequency of the Banana Pi the ~400MHz that is quoted elsewhere or is it twice that because it is DDR3 memory? Would like this cleared up.
432MHZ by default.

Thanks for clearing that up. Will a future revision of the Banana Pi have anything faster?

blindpet replied at Sat Dec 27, 2014 18:11
Thanks for clearing that up. Will a future revision of the Banana Pi have anything faster?

You can set the dram frequency to 480 by yourself: https://github.com/LeMaker/u-boo ... 7i_432_1024_iow16.c
BPro can be run at 480, but in order to be more stable, we set it to 432 by default.

Here is a dram test report:
ddr_test.jpg

Thanks for the info, I find it strange that other Pi clone machines with DDR3 run at 800 MHz but the BPi runs much slower.

Are you sure that because it is DDR3 we should not be doubling the RAM bus since DDR is double data rate. So it is really 864 MHz? I don't see any DDR3 memory that runs below 800 MHz. Can you clarify this too?

tkaiser  
Edited by tkaiser at Fri Jan 2, 2015 17:13

Please keep in mind that Allwinner boards are cheap and not comparable with high-end-ARM devices or x86 with dedicated memory controllers. You might want to read the whole stuff here: http://linux-sunxi.org/A10_DRAM_Controller_Calibration

If you're out for an unstable system corrupting data then feel free to max out RAM clocking.

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