[Arm-netbook] The open risc v idea is good

zap zapper at openmailbox.org
Wed May 3 14:46:13 BST 2017

On 05/03/2017 06:38 AM, Luke Kenneth Casson Leighton wrote:
> On Wed, May 3, 2017 at 11:28 AM, zap <zapper at openmailbox.org> wrote:
>> On 05/03/2017 01:01 AM, Luke Kenneth Casson Leighton wrote:
>>> ---
>>> crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
>>> On Tue, May 2, 2017 at 10:50 PM, zap <zapper at openmailbox.org> wrote:
>>>> I assume that's going to be the third series of libre cards right? you
>>>> making a lowrisc based processor and graphics, etc,
>>>  more likely the fourth or fifth.  all these things happen in
>>> parallel.  the one after the RK3288 to investigate is the RK3399
>>> (6-core).  also i've heard that the iMX7 is out so am having a look at
>>> that.
>> RK3399... 11.0 ghz speed if you count all the four cores which are 2 ghz each and 1.5 for the other ones...
>> wow...
>> I wonder how much watts that processor uses...
>> that is crazy fast. I mean really... 4GB ram too I see as the norm. which is good.
>> on a different note though, perchance will the fourth or fifth series of libre cards support 8gb of ram or more?
>> I bet you could even get it to 16gb if you wanted... though that wouldn't be needed. heh.
>  the cost of the RAM ICs to do that are insane.  the 1GB DDR3x16 ICs
> are already $10 **EACH**.
>  normally a DIMM would have 8 or 16 RAM ICs, meaning that for a 4GB
> DIMM you need 8x 512mb ICs, or you could do 8GB by using 16 of them.
>  normally you get 2 (matched) DIMMS totalling 8GB.
>  if you want *32* GB you get 2 matched DIMMs, but nobody in
> "mass-production" is shipping windows PCs or laptops with 32GB of RAM
> (and if they are it's DDR4)
>  additionally, it would need either 2 pairs of x32 DDR RAM
> controllers, or it would be necessary to do a cascade layout: a
> daisy-chain of RAM ICs.... and i'm not sure it would be possible to
> fit 8 RAM ICs onto the 43x78mm PCB anyway.
>  bottom line it's far too expensive and quite impractical.  4GB is the
> practical limit at the moment and even that's stupidly expensive
> relatively speaking.
> l.

Ah... okay I had no idea it would be that expensive if you made it from
scratch. my bad.

I will add that 32gb is absolutely insane and even 16gb is.

I wouldn't need that :)

8 would be my limit and even that is a want per-say... :)

but if it would be impractical then screw it I say. :)
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