[mythtv-users] 32 or 64 Bit

[Raymond Wagner]

On 3/4/2010 21:19, Laurence Huizinga wrote:
> I have two tv cards, a DVICO Fusion Lite HDTV and a Leadtek Winfast 
> DTV1000T.  I think I am right in saying that these cards have 32 bit 
> interfaces.

Those cards have a 32-bit PCI bus.  That means for each clock cycle (at 
33MHz), 32-bits are transferred.  This has nothing to do with a 64-bit 
processor, which has 64-bit large registers, and performs calculations 
directly on 64-bit integers

> The reason I ask is that this CPU is not "pure" 64 bit from what I 
> have read, but still works ok in my estimation.

The processor is not 'pure 64-bit' because it has the ability to fall 
back to 32-bit mode, and natively run 32-bit code.  This is the same 
concept as will older 32-bit processors which would fall back and 
natively run 16-bit code.  64-bit mode incurs a bit more memory usage, 
and has a slight performance loss when running 32-bit code.