x86-64 proc list

So my friend is somewhat computer savy, and turns to me for advice once in a while but has me stumped, Windows Home Server 2011 supports only x86-64 hardware. How do i KNOW that a proc or mobo is x86-64 hardware? Other wise specs seem pretty weak, 1.3 or 1.4 Ghz... really thats all?

best bet it to look it up with the manufacturers web site.

For instance this is one of my older 64 bit CPUs.
http://ark.intel.com/products/28016/64-bit-Intel-Xeon-Processor-3_20-GHz-1M-Cache-800-MHz-FSB

You can also download cpuz and it will tell you what processor and if its 64 bit or not.
http://www.cpuid.com/softwares/cpu-z.html

If it shows EM64T or AMD64 in the instructions field, it is 64 bit.

What CPU do you have?

Almost every new processor has x86-64 support.

Here's a 29 dollar one.
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103944

Apparently newegg only carries 4 cpu's that DON'T have a64 support. they are all recertified pentium 4.

go get a CPU-Z and identify the code name, of the cpu(of your choice or which comes to your mind), like propus or deneb for phenom ii and like wolfdale for C2Duos... then look here, these cpus all support x86-64(older than this is not supported)
ADM
http://en.wikipedia.org/wiki/X86-64#AMD64_implementations
Intel
http://en.wikipedia.org/wiki/X86-64#Intel_64_implementations

i, myself encountered the same problem and tried to install win server 2008 r2 on a pentium M laptop(dothan) which is very old and is not supported...