Albofighter
Newcomer
Ihere said sonys target has been 192 GB/S (assuming 4 gb ram) since 2011 but not sure if thats gdrr5 http://www.neogaf.com/forum/showpost.php?p=46846238&postcount=157
And those have nothing to do with having to change your entire design from 4GB GDDR5 to more. It's not a hard concept to grasp. Try to keep up with the topic.
Ok. But I think you overestimating engenering cost of memory side. I thought previous prototypes of ps4 (feb 2012) was designed with 2 GB, and then sony changed it to 4 GB (oct 2012 I think). So if design is not so final, they could change things. It's more realistic than ddr4 which is nowhere in a wild, and which production could be unpredictable in cost and supply.
Orbis memory has shifted in the past. Orbis was "originally" rumored to have 2GB. Now 4GB.
Does anyone know for certain what the target memory for the PS4 is 4GB? And does anyone know the target memory for the PS4 is GDDR5?
Or are we still all debating dev kits and rumors? Because if that latter is the case there is no "re-engineering" going on, just maturing development kits.
I am stating the obvious because the same points about engineering costs, difficulty, costs, etc were raised when Orbis was "slated" to have 2GB and people heard rumors of "wanting 4GB." Ta da, it "now" has 4GB.
So unless one of you is a real insider you don't know Sony's target and what they designed to begin with. So meh.
On the other hand the bigger issue worth talking is GDDR5 is expensive and 8GB would require a LOT of chips. That, and not "11th hour" design changes seems more of a hurdle.
Ihere said sonys target has been 192 GB/S (assuming 4 gb ram) since 2011 but not sure if thats gdrr5 http://www.neogaf.com/forum/showpost.php?p=46846238&postcount=157
2, 4, 8GB of GDDR5 = 256bit memory bus. 3, 6, 9 = 384bit memory bus. They'd basically have to rework the whole chip to go from 4 to 6GB. Not going to happen.
Orbis memory has shifted in the past. Orbis was "originally" rumored to have 2GB. Now 4GB.
Does anyone know for certain what the target memory for the PS4 is 4GB? And does anyone know the target memory for the PS4 is GDDR5?
Or are we still all debating dev kits and rumors? Because if that latter is the case there is no "re-engineering" going on, just maturing development kits.
I am stating the obvious because the same points about engineering costs, difficulty, costs, etc were raised when Orbis was "slated" to have 2GB and people heard rumors of "wanting 4GB." Ta da, it "now" has 4GB.
So unless one of you is a real insider you don't know Sony's target and what they designed to begin with. So meh.
On the other hand the bigger issue worth talking is GDDR5 is expensive and 8GB would require a LOT of chips. That, and not "11th hour" design changes seems more of a hurdle.
2, 4, 8GB of GDDR5 = 256bit memory bus. 3, 6, 9 = 384bit memory bus. They'd basically have to rework the whole chip to go from 4 to 6GB. Not going to happen.
Going from 2 GB to 4 GB of GDDR5 is relatively easy. The bus width doesn't change, you just use higher density memory.
Going above 4 GB of GDDR5 means changing the bus width which means changing your memory controller which means changing your CPU design.
It isn't cheap and it isn't easy.
Regards,
SB
I just want to know what those 16GB devkits were used for, if they exist.
Going from 2 GB to 4 GB of GDDR5 is relatively easy. The bus width doesn't change, you just use higher density memory.
Going above 4 GB of GDDR5 means changing the bus width which means changing your memory controller which means changing your CPU design.
It isn't cheap and it isn't easy.
Regards,
SB
Perhaps this is a silly question so excuse my ignorance but could you design a controller capable of supporting 8GB and test out 4GB and depending on performance up the ram later?
temesgen, we don't even know if there was a SoC spun that only supported 4GB. We know there have been devkits with discrete GPU boards and rumors of lower end SoCs.
Orbis likely will have 4GB of memory, if it was designed for GDDR5, for the reasons I noted earlier. But there is no need to speculate about a revised memory controller and major changes if, indeed, the devkits were using discreet GPUs.
Like I mentioned earlier people are taking devkits (which are glorified PCs) and rumored specs and then looking at "changes" to the plan. For pete's sake, the Xbox 360 started off with some G5's and Radeon 9800 Pros and moved onto some X800s -- that doesn't mean MS "changed" the design.
yes 256bit controller can support 4 or 8GB GDDR5 and devkit seem already 8GB
http://www.vgleaks.com/orbis-devkits-roadmaptypes/
yes 256bit controller can support 4 or 8GB GDDR5 and devkit seem already 8GB
http://www.vgleaks.com/orbis-devkits-roadmaptypes/
The dev kit likely has 8 GB of DDR3 combined with the discrete graphics card with 2 or 3 GB of GDDR5.
All 3 of those devkits in that link of yours uses a discrete graphics card. It's possible the discrete graphics card may have 4 GB of GDDR5, but I'm not sure Sony would want to pay that much for a limited run development kit. Custom firmware (as mentioned in the link) is relatively easy. Custom GDDR5 amount for a one off discrete graphics card to only be used on the pre-release dev kit would be much more costly.
Regards,
SB
no the last devkit (named "SoC based devkit") use the final SoC and GDDR5 of course (no discrete GPU, no DDR3)