Ram selection is a bit of a bugger isn’t it? I couldn’t tell you if your selection will work for sure, maybe someone is using the same as you are asking about. I have the same mobo with 12GB (six sticks) of Kingston KXH1600C9D3K3/6GX and it is good. It seems the KXH1600C9Dxxx is the only telling info on the QVL. It also seems they wash their hands of supporting any set of six sticks at 1600.
Sure you have the settings in AfterEffects CS5 set up to use your existing hardware (CPUs and RAM) under [Edit/ Preferences/ Memory and Multiprocessing]?
What ram etc configuration do you have your After Effects settiungs set to? Perhaps a screen capture?
Please don't split the same conversation between the After Effects forum and the Hardware forum.
If you really want the Afetr Effects perspective, then consider posting a link in the After Effects forum to point to this thread.
It's really hard to help people when they ask the same question in two (or three or four...) places.
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I saw the document Kopriva posted in the AfterEffects forum. Quite a large document; very informative. I am going to work with it. I figure I will always be learning new stuff for Ae. I primarily work in Premiere and my largest client is pushing me into Motion…
I keep it simple: RAM – of my 12GB available I assign nine to Ae leaving three for OS and possibly Pr idling in the background or for bailing to Digital Juice etc (now Ae idling and possibly do an [Edit/ Purge/ All]). If I do anything demanding in Ae I tend to do it when everything else is shut down. Of my eight cores available I reserve two for other apps. I have the Render Multiple Frames Simultaneously turned on.
In my earlier post I mentioned settings because it sounded like you were really dogged down; IMO more RAM is certainly a good idea if you can afford it. I want more myself for longer previews etc…