I have my system running 64-bit Gentoo with no real problems.  32-bit and 64-bit software run on the system as long as there are corresponding libraries for the app to link to.  Ardour is compiled as 64-bit which means I cannot use VST's in it, but dssi-vst works fine since Wine seems to be 32-bit and they are run as a separate process from the 64-bit audio apps.  I haven't seen any problems with Flash/Java/ or media players.  I can't address the video card as I use an Nvidia with the Nvidia 64-bit binary driver which works fine for me.  The reason I switched to 64-bit was that I upgraded to 8 GB memory for rendering in blender.  

Matt

On Thu, Aug 13, 2009 at 3:22 PM, Julien Claassen <julien@c-lab.de> wrote:
Hi Ismael!
  64bit can address more memory (I think this relates to RAM. I think the
integer size used by the CPU is larger. So good for large numbers? and for a
lot of mem. Some people also claim in RT apps it's faster, but I don't really
believe that.
  32bit: All the wndows dlls will run. I guess you'lll also find more
precompiled half-closed software pieces for 32bit. Mplayer and some other
programs can use .dll and other windows shared libs to support audio/video
formats and maybe more. Java shouldn't be an issue. You should only need the
java interpreter and the rest is byte-code, that's supposed to be the same for
all systems. but 32bit might also be nice if you're going to use VST(I)s,
because they too are pieces of 32bit windws software. But I'm not sure how far
the technology has gone here.
  Kindest regards
        Julien

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