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There are some mysterious ways about memory management in CS5 and we have not yet figured out what happens when increasing memory over 12 GB, but it looks like there is some kind of 'performance stepping' when one increases memory beyond 12 GB.
Mind you, this only applies to MPEG2-DVD encoding, not with AVI exports or H.264-BR encoding.
If you have more than 12 GB memory, your MPEG2-DVD encode times drop significantly, often by more than 50%, but the strange thing is that this already occurs with 14 or 16 GB, not only with 24 GB. Look at Baz's results at rank #2 with 14 GB or Bill's at rank #4 with 16 GB on the results page of PPBM5 Benchmark.
I'm sorry to say we have not yet figured out what is going on here, but then we are not privy to the architecture of PR CS5 memory management. Nevertheless I hope this helps.
As I dont rate MPEG2-DVD encoding high in my workflow priorities...I guess it doesnt seem worth while or advantageous for me.
Wonder what happens when using non CUDA / MPE enabled FX in the timeline and rendering of same.? ie Is RAM used in fx processes?
Ram is used in every process that you do in Adobe. The Cuda engine just adds more to the ram because the data sent to the GPU ram is dispatched from the system ram and sent back again after the gpu processing. The memory usage lowered some from some optimizations that were made with the 5.0.2 update so it seems projects similar to ppbm5 don't need much more than that to export MPEG2 files at optimal performance. Mind you some HD codecs use MPEG 2 as well so likely XDCam and DVCPro HD and other Mpeg 2 based codecs will also benefit from the greater than 12GB of ram. Now this is based off your projects and editing style so many projects may utilize more ram than others. PPBM5 gives you a good idea to reference versus your normal projects in order to compare which are more extensive with layers and effects and there by make use of more ram.
For 2 days now I have been trying to access the PPBM5 results from the above link but it is not working. The PPBM5 link works, but every time I click on Benchmark Results my browser screen blanks out (browser is IE8 on WinXP 32 bit SP3); is the PPBM5 site having issues, or am I doing something wrong?
works for me with Firefox
Not working IE7.
Yes it does work in Firefox - thanks!