firelink said:
DDR5 doesn't exist yet. GDDR5 is a form of DDR3 optimized for graphics.
Two components of a computer need access to RAM - the GPU and the CPU. The GPU is bandwidth limited. Higher bandwidth = greater performance here, generally.
The CPU though is latency limited. This is why GDDR RAM is not used as system RAM. Most RAM on a PC goes to the CPU, only going to the GPU if there is not enough VRAM. GDDR5 has very high latency. It would not perform well at all.
People need to stop thinking higher numbers equals better solutions. Most of that 8GB won't be used anyway. Blu-ray has a read speed of somewhere around 20MB/s. What's 8192 / 20? It would take close to a 7 minute load in order to cache all of the data in RAM.
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I'm sure Sony has engineered a way to reduce the latency issues of GDDR5 in this system. Them and developers know about this already, and I don't think they would be exited unless the issue had been delt with in some way. As for the load times from the BD-ROM, things are not quite as bad as you are painting them out to be. First the tentitive spec calls out for a 6x drive which has a read speed of 27MB/s, so that would mean 5min to fill 8192MB. That is not a real world case though. First they will never use the full 8GB, they may use 6, but I think that is even a little high. That takes the loads down to about 3.8min. Again that won't be the case. Every system has an HDD, and they have a secondary chip now so the can install data to the HDD out of sight out of mind. So the first time you boot up a game you may rely on the BD-ROM, but after you play and the game installs to the HDD you will have somewhere around 100 - 120MB/s read speeds. That would drive all future load times down to under a minute.
That is a worst case scenario though based on what we know so far. Sony could always add in a small on board SSD and nearly completly eliminate load times. They could use a 10 or 12x BD-ROM as the price difference is only a couple of dollars. This is one thing I saw on the released spec sheet, and kind of cringed over, but it is not quite as bad as you are paining it out to be. I just hope they will have one last trick to pull out of the bag at E3.
As far as GDDR5, it could be like Cell in that devs that optimize for it, will be able to get more and more out of it for a very long time. Look at what Guerrilla, Santa Monica, and Naughty Dog were able to do buy shoving tasks off to the SPE's. For the most part though, I think this is a much better crazy move than Cell, because this was something the development community was begging for opposed to burning down buildings over.
Stop hate, let others live the life they were given. Everyone has their problems, and no one should have to feel ashamed for the way they were born. Be proud of who you are, encourage others to be proud of themselves. Learn, research, absorb everything around you. Nothing is meaningless, a purpose is placed on everything no matter how you perceive it. Discover how to love, and share that love with everything that you encounter. Help make existence a beautiful thing.
Kevyn B Grams
10/03/2010
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