Some specific answers: Now have my x64 serial number & am in the process of 'implementing' it. As noted previously, I have a Vista64 desktop & a 32bit XP laptop, both currently with 32bit Manifold. Begin by reading http://www.manifold.net/doc/32_bit_and_64_bit_manifold_editions.htm Two key concepts from the above: 1. 64-bit Manifold serial numbers can enable either a 32-bit Manifold installation or a 64-bit Manifold installation. A 32-bit serial number can only enable a 32-bit installation. 2. An x64 Manifold .msi when installed will automatically create both a 64-bit Manifold .exe and a 32-bit Manifold .exe. A 32-bit Manifold .msi when installed will create only a 32-bit Manifold.exe. (as might be expected) Onward: I assume that you upgraded your 8.00 32-bit serial number to an 8.00 64-bit serial number. If you traded in your 32-bit serial number to get a 64-bit serial number (which is what you did if you acquired the Upgrade to x64 product for $50) then your 32-bit serial number has been revoked and you risk your license by continuing to operate any installation in which that 32-bit serial number was used. So, your first step now is to assure that no installation is running on that 32-bit serial number. On the laptop, launch Manifold and choose Help - Activate. Enter the new 64-bit serial number and get an activation key. When Manifold restarts, you'll be running 32-bit 8.00 Manifold but now using your new 64-bit serial number to enable that installation. On the Vista64 desktop, launch Manifold and choose Help - Activate. Enter the new 64-bit serial number and get an activation key. When Manifold restarts, you now will be running 32-bit 8.00 Manifold using your new 64-bit serial number. However, since this is a 64-bit desktop you want to be running 64-bits. The easiest way to do that is to uninstall Manifold using the Control Panel's add/remove programs applet. Next, using the 64-bit Manifold .msi installation package, install Manifold. The 64-bit .msi will create two Manifold .exe's on your computer: a 32-bit one and a 64-bit one. Because activation will be remembered both will be activated using the 64-bit serial number you provided earlier. 1. IIRC, it was somewhere recommended that both the 32 & 64 bit versions be installed on an x64 system (since some things still perform better in 32 bit mode). Correct? No. An x64 Manifold .msi automatically will create 32-bit and 64-bit .exe's, so you don't manually need to install from a 32-bit .msi and a 64-bit .msi. It's not really accurate to say that some things perform better in 32-bit mode because everything that runs performs better in 64-bit mode. It is just that some things (such as Jet) don't exist in 64-bit mode. 2. Does that mean that 2 activation keys will be required for the desktop (one for the 32 bit version & one for the 64 bit version)? No. 3. A third key will then be required for the 32 bit version on the laptop? That would be a second key. You'll need one activation key for the desktop and one activation key for the laptop. 4. I assume (from 1 above) that there should be no problem with having both 32 & 64 bit versions be installed on x64 desktop? Correct, if you do that by letting the x64 .msi do it for you. 5. OR ... do I not need to uninstall the 32 bit version before installing the new 64 bit version that I just downloaded? You could do it either way, but the pathway I gave above is more difficult to get wrong. :-) By the way, whether CUDA drivers are available for x64 Vista is something NVIDIA has said they will do so the way to check on that is to visit the NVIDIA web site from time to time. (I think I've given a link to the CUDA downloads portion of the NVIDIA site in another thread.)
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