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-   -   Sony reduces OS ram usage (http://www.nvnews.net/vbulletin/showthread.php?t=148263)

Ryeyoo 02-24-10 11:22 AM

Sony reduces OS ram usage
 
http://www.joystiq.com/2010/02/23/70...s3-developers/

I found this odd, considering how ram limited the ps3 already is with only 256mb of system ram, it used almost half for the OS?? At least they've reduced it though.

abcgamer 02-24-10 12:23 PM

Re: Sony reduces OS ram usage
 
Yes that is really cool. For consoles even little amount can help I think. PS3 memory is 256mb DDR3 + 256mb XDR @3.2ghz. I think next gen will have 1gb but price should be reasonable. Not many wanted to buy PS3 when it was 400 and 500$. They all went and bought wii and 360 instead :confused:

HiCZoK4 02-24-10 03:26 PM

Re: Sony reduces OS ram usage
 
Yea. Even 70mb is allright. Its weird how 360 came with standard 512 and ps3 with unified 2x256(one part on gpu)

Revs 02-24-10 03:29 PM

Re: Sony reduces OS ram usage
 
The 360 was gonna have 256mb initially, but that soon changed their mind when they saw what the extra 256mb did to performance. I can't believe the PS3 gets away with 256mb.

Ryeyoo 02-25-10 01:25 AM

Re: Sony reduces OS ram usage
 
Quote:

Originally Posted by Revs (Post 2195248)
The 360 was gonna have 256mb initially, but that soon changed their mind when they saw what the extra 256mb did to performance. I can't believe the PS3 gets away with 256mb.

Well, it's 512 shared which does add more flexibility but I'm not sure it's taht significant to 256 for system and 256 for video. I'd imagine you could program it so that the ram streams from system to gpu relatively easily. I believe the 360s 10mb of dedicated gpu(digitalfoundry mentions it frequently) ram helps the 360 a lot more than the unified architecture.

jlippo 02-25-10 03:01 AM

Re: Sony reduces OS ram usage
 
Quote:

Originally Posted by Ryeyoo (Post 2195515)
Well, it's 512 shared which does add more flexibility but I'm not sure it's taht significant to 256 for system and 256 for video. I'd imagine you could program it so that the ram streams from system to gpu relatively easily. I believe the 360s 10mb of dedicated gpu(digitalfoundry mentions it frequently) ram helps the 360 a lot more than the unified architecture.

RSX can read and write to both memory pools, altough with some restrictions in block size and so on.
As can Cell, but it can only read from GDDR3 with speed of 16MB/s. (basically it's for debug.)

The 10MB on X360 GPU actually resides on completely different die which also hosts ROPs.
This also means that only read and blend frame buffer operations can use the massive bandwidth it offers.
ALUs or texture units cannot do anything in it, but work solely trough main ram.
One of the big advantages is that blending is free in terms of bandwidth and that currently used framebuffer doesn't take any memory and MSAA is resolved when copied to main ram. (with 720p 4xMSAA this is around 28MB saved main memory.)


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