There are two reasons to move up to 64 bit, I think. The first is that a 32 bit OS is only capable of counting up to 2 to the 32nd.
That's 4,294,967,295. That's an issue because every RAM location available to the OS has to have a numeric 'address' - which means that a 32 bit OS is limited to addressing altogether a little over 4 GB. The operating system itself sets aside a bunch of that for its own personal use, which leaves around 3 GB and change. No matter how much RAM you put into your machine, Windows 32 is limited to addressing a little over 4, and SAW and SAC and any other software running on the machine concurrently, combined, will be limited to a little over 3. If you use a DAW, plus VST effects, plus VST instruments - you can easily chew through all of that in no time. Whereas a 64 bit OS can count to 2 to the 32nd addresses. Each additional bit doubles the previous total - and so that's a really big number. More RAM than anyone here can afford or any PC on Earth can hold physically. But, you could install, say 32 GB, Windows 64 will address it all, and then your VSTi will never run out of available addressing for more instruments. Cary, I'm not really talking to you here. I know you know all this. But maybe it will help someone else.
And the second reason is that, as people have mentioned, 64 bits is where the future of digital music is going. So computer synths, samplers, VST FX, etc - in the same way that you can't get 16 bit versions anymore - you, eventually, won't be able to get 32 bit versions. I also kind of wonder whether Microsoft will eventually tire of supporting 32 bit Windows. Not yet though, clearly.
There are disadvantages too. Windows XP was the last potentially super-stable version for SAC/SAW (although you can't buy a motherboard for XP anymore). There are a lot more background processes in Windows 10 than there were in Windows XP. If one holds up the show long enough to overrun a SAW record buffer - those moments are lost forever. Those of us who have moved over have mostly had to spend a lot of time tracking down the causes and eliminating them and some of us have gone to great lengths. Still - it's working for me now, at least. I'm really happy with the stability detente I've arranged with SAC/SAW 64. I'm happy I moved. Sometimes I miss Bob's native reverb. But I have others. You don't get the same result with them - but it can definitely be a good result just the same.
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