Which is the best choice, pae or x64?

[Christopher Chan]

Rofail Qu wrote:
>> An Intel x86 cpu cannot run x64 applications. Your E8400 is NOT a x86
>> cpu. It is an EMT64 cpu. To run x64 applications, you have to use EMT64
> Thanks for target my mistake. In my thought, EM64T is the extention of IA-32,
> not REAL 64 bit.

Hmm, it looks I need to update my acronyms. It's called Intel 64 now. 
Both AMD64 and Intel 64 are extentions of x86 but they are full 64-bit 
extentions. AMD was first and they implemented it such that it would be 
fully backward compatible with the basic x86 (SSE and so on are another 
story) so it is both REAL 64-bit and an extention of the x86 instruction 
set.


> so i really want to know is if it could run on a 64-bit ubuntu faster than
> on a pae version.
> In fact, i have this pc runs on a pae kernel for years.

It really depends on whether you are getting memory access penalties due 
to having to use bounce buffers.