| secpierre34 said: It doesn't need 8gb of gddr5 dedicated memory and it is not just cache. |
So you are agreeing, yet disagreeing with me.
The GDDR5 Ram on a PC is just a cache! A cache dedicated to the GPU.
For example, take AMD's Cayman architecture, the L1 and L2 caches in the GPU were unchanged over Cypress, but AMD still threw twice as many Tessellators in the GPU. - That's allot of geometry information which can't fit in those tiny caches, so where is the Geometry supposed to go? Back to a larger but slower cache, enter: GDDR5 memory.
AMD and nVidia call the memory next to a GPU an "Off-Chip Buffer" for a reason, it's a cache.
https://en.wikipedia.org/wiki/Cache_%28computing%29
| secpierre34 said: Hard drive are cache as well but the difference between ram and your hdd is speed. |
And then you contradict your entire post with this simple line.
| secpierre34 said: You can't fit 7gb worth of data in a 6gb machine. Your machine would slow down, and the effect would be based on how fast your memory can quickly swap data, THEREFORE THE IMPORTANCE OF SPEED IN RAM. |
That's the point of a cache hierachy's on the PC, so you don't have to.
Why do you think all memories in a PC go from Slowest+Largest to Fastest+Smallest? It's to hide latency and bandwidth deficits in all stages of memory retrieval whilst keeping costs down so you don't need 16Gb of L1 cache each on the GPU and CPU.
Remember, GDDR5 is pitifully slow compared to L1 and L2 caches.
The need for 8Gb of GDDR5 on a GPU isn't needed now or in the immediate future on the PC, main graphics tasks will be stored in the current GPU memory with excess data in system memory which will get swapped into the GDDR5 on demand, in-fact, that's how it's always worked with PC graphics, even before the AGP bus or DDR was ever invented.
And by the time that GPU's will need 8Gb of GDDR5, JEDEC should ratify the GDDR6 standard anyway, making the PC a generation ahead in memory technology. (And is due out next year.)
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