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Forums - Sony Discussion - PlayStation 4 gives up to 5.5GB of RAM to game developers

drkohler on 27 July 2013
RenCutypoison said:

The dedicated hardware part must be a part of the APU with a bridge connecting the GPU so that every Image send trough video out is send to RAM, then every pack of X images are sent back to the GPU (A part of the GPU dediacted to video encoding) and thus the 15 minutes limit is the RAM limit.

That's how I would do it tough, it may not be that way and I probably say shit.

That would be the dumbest way to do it as it greatly bogs down your main memory bus. I'd simply use a "listening chip". This "listening chip" (we axtually know there is something in the apu doing something with video streams)  hooks into the digital stream to the hdmi video out, compresses the stream on-the-fly, and sends the compressed stream to the harddisk/to the internet connector. This way, not a single main memory cycle is used. While 176GB/s sound like a lot, you do not want to waste any byte of that bandwidth to secondary tasks. better throw in some more $ even if the beancounters protest...

In fact, if it is not done (somehow) like this, M. Cerny/whoever designed the system would lose a lot of respect from me.



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Adinnieken on 27 July 2013
gooch_destroyer said:
Adinnieken said:
ClassicGamingWizzz said:
Nsanity said:
NeoGaf never had a problem with Digital Foundry posting negative articles on the Xbox One and Wii U, so why the sudden change of heart?


you never get tired of this do you

Hypocrisy is always fun.  Why do you think The Daily Show and The Colbert Report do so well?

What? they're better than those other news shows *coughFoxnewsCough*

They are, but the point of their existence is to point out the hypocrisy of the news media.



RenCutypoison on 27 July 2013
walsufnir said:
RenCutypoison said:
ethomaz said:

I can be wrong but the video record uses dedicated hardware... stack RAM.


From what I remembered from my assembly language lessons, stack is only a few kB.

The dedicated hardware part must be a part of the APU with a bridge connecting the GPU so that every Image send trough video out is send to RAM, then every pack of X images are sent back to the GPU (A part of the GPU dediacted to video encoding) and thus the 15 minutes limit is the RAM limit.

That's how I would do it tough, it may not be that way and I probably say shit.


Stack RAM is not stack the way you once learned. It means "on chip" in this context. Actually it's called "stacked RAM".

Thanks for the info. 

So it's still all about how they encode the video, as 512mb SDRAM seems not that much for non encoded.

If the video isn't on the RAM, it's just impossible that Sony, wich was once the king of embedded hardware, would use 3.5 GB for the OS, or there are freaking awesome news to come OS-side.



gooch_destroyer on 27 July 2013
Adinnieken said:
gooch_destroyer said:
Adinnieken said:
ClassicGamingWizzz said:
Nsanity said:
NeoGaf never had a problem with Digital Foundry posting negative articles on the Xbox One and Wii U, so why the sudden change of heart?


you never get tired of this do you

Hypocrisy is always fun.  Why do you think The Daily Show and The Colbert Report do so well?

What? they're better than those other news shows *coughFoxnewsCough*

They are, but the point of their existence is to point out the hypocrisy of the news media.


Argeed. I love watching those shows.



RenCutypoison on 27 July 2013
drkohler said:
RenCutypoison said:

The dedicated hardware part must be a part of the APU with a bridge connecting the GPU so that every Image send trough video out is send to RAM, then every pack of X images are sent back to the GPU (A part of the GPU dediacted to video encoding) and thus the 15 minutes limit is the RAM limit.

That's how I would do it tough, it may not be that way and I probably say shit.

That would be the dumbest way to do it as it greatly bogs down your main memory bus. I'd simply use a "listening chip". This "listening chip" (we axtually know there is something in the apu doing something with video streams)  hooks into the digital stream to the hdmi video out, compresses the stream on-the-fly, and sends the compressed stream to the harddisk/to the internet connector. This way, not a single main memory cycle is used. While 176GB/s sound like a lot, you do not want to waste any byte of that bandwidth to secondary tasks. better throw in some more $ even if the beancounters protest...

In fact, if it is not done (somehow) like this, M. Cerny/whoever designed the system would lose a lot of respect from me.


Of course it's dumb, I only study on high level programming lol, I suck at all these hardware things.

Still, fast-encoding will either get you a shitty video, either will take a lot of harddrive.



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Adinnieken on 27 July 2013
Scoobes said:
RenCutypoison said:
ethomaz said:
And DF "sources" is this guy...

http://forum.beyond3d.com/showpost.php?p=1769150&postcount=2515


Remember what I said a few days ago about non encoded videos taking a lot of space ? 

There is at least 1GB in OS RAM for the video, I think

Why on Earth would video encoding 7-15 mins of video take up that much space? The last TiVo box only had 512MB of RAM and that records more than 1 stream of video for a lot longer than 15 minutes.

http://en.wikipedia.org/wiki/TiVo_digital_video_recorders#Series3_HD_TiVo

It's only encoding in MPEG-2 (Encoder: Trident SAA7164 MPEG-2 encoder).



RenCutypoison on 27 July 2013
Scoobes said:
RenCutypoison said:
ethomaz said:
And DF "sources" is this guy...

http://forum.beyond3d.com/showpost.php?p=1769150&postcount=2515


Remember what I said a few days ago about non encoded videos taking a lot of space ? 

There is at least 1GB in OS RAM for the video, I think

Why on Earth would video encoding 7-15 mins of video take up that much space? The last TiVo box only had 512MB of RAM and that records more than 1 stream of video for a lot longer than 15 minutes.

http://en.wikipedia.org/wiki/TiVo_digital_video_recorders#Series3_HD_TiVo


You want your 480p 30 fps video to take more or less than 10 GB ? (yeah, it's an exageration)



Scoobes on 27 July 2013
RenCutypoison said:
Scoobes said:
RenCutypoison said:
ethomaz said:
And DF "sources" is this guy...

http://forum.beyond3d.com/showpost.php?p=1769150&postcount=2515


Remember what I said a few days ago about non encoded videos taking a lot of space ? 

There is at least 1GB in OS RAM for the video, I think

Why on Earth would video encoding 7-15 mins of video take up that much space? The last TiVo box only had 512MB of RAM and that records more than 1 stream of video for a lot longer than 15 minutes.

http://en.wikipedia.org/wiki/TiVo_digital_video_recorders#Series3_HD_TiVo


You want your 480p 30 fps video to take more or less than 10 GB ? (yeah, it's an exageration)

OK, now you're confusing me. The specs I mentioned were for the Series 4, which supports 1080P video.




Get your Portable ID!

Nsanity on 27 July 2013

Well, this was helpful...

"Anyway, I’m not saying how much memory is used"

http://retrocityrampage.com/blog/2013/07/522/



RenCutypoison on 27 July 2013
Scoobes said:
RenCutypoison said:
Scoobes said:

Why on Earth would video encoding 7-15 mins of video take up that much space? The last TiVo box only had 512MB of RAM and that records more than 1 stream of video for a lot longer than 15 minutes.

http://en.wikipedia.org/wiki/TiVo_digital_video_recorders#Series3_HD_TiVo


You want your 480p 30 fps video to take more or less than 10 GB ? (yeah, it's an exageration)

OK, now you're confusing me. The specs I mentioned were for the Series 4, which supports 1080P video.


It's fast encoding. Fast encoding is bad. Bad quality, takes space and rip your eyes off.