What Exactly are the Benefits of More GPU RAM for PP, AE, PS ?

What benefit is there to having, say 4gb GPU RAM over 2gb ?
I have read numerous conflicting, and perhaps misguided, claims regarding when/why one would rather have a graphics card with more than 2gb RAM.
Does this impact effects render, multiple monitor resolution, CUDA, Mercury Playback Engine performance, other areas, etc. and how?
Thanks for your response.
A Ajar

2GB of video ram is more than enough for the Hardware MPE engine and 1080 media with effects. Essentially the greater the ram space on the video card the greater ram caching available for the Cuda acceleration to buffer data ready for GPU processing. The Application memory management ie caching profiles though effect this based on each codec and resolution ie data per frame. However along with this you have to have enough system ram to create the buffers used to cache the data down to the GPU ram since that data shadows down for GPU processing and then back again for final encoding. This means that not configuring enough system ram will limit the amount of GPU ram used. Hence why you want atleast 16GB of ram for HD and the hardware MPE engine. 3GB+ ram spaces on video cards are for 2K to 4K + frame sizes ie R3D and Raw/CinemaDng. This is because the data per frame multiplies significantly when at 4K resolution. This require far greater ram space which is why you look for the 3GB+ ram space cards for those workflows. The Effect data will also increase because there is far mroe resolution data to alter. This is on top of the drawing out data which is what you see on the screen. That is when the differences for the cards show.
Eric
ADK

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francorosso wrote:
I suffer from the same massive PROGRAM GUIDE pain as everyone else with FIOS. Can anyone post a link to a list which actually shows the SD duplicates with their channel numbers so I can edit them out? I realize Verizon isn't going to provide an easy way to do this like DirecTV, and I am fully capable of editing my program guide, but it would go a lot easier if I just had a list of all those channels in front of me while I edit the guide. It's just too **bleep** tiring to figure it by myself.
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