Straw poll :
What x86 extra instructions can your CPU do?

Myself, I am not in love with CISC or the kludge the x86 has become but the vast majority of CPUs used by people are x86. BOINC availability outside of x86 is limited, so that does not help.

So for clarity :
http://en.wikipedia.org/wiki/X86

has these extra instructions

http://en.wikipedia.org/wiki/Template:Multimedia_extensions

that can be found by

http://en.wikipedia.org/wiki/CPUID

My PC has the following ...

Number of cores 2 (max 2)
Number of threads 2 (max 2)

Name Intel Pentium E2140
Codename Conroe

Specification Intel(R) Pentium(R) Dual CPU E2140 @ 1.60GHz

Package (platform ID) Socket 775 LGA (0x0)

CPUID 6.F.D
Extended CPUID 6.F

Core Stepping M0
Technology 65 nm
Core Speed 1600.2 MHz

Multiplier x FSB 8.0 x 200.0 MHz
Rated Bus speed 800.1 MHz
Stock frequency 1600 MHz

Instructions sets MMX, SSE, SSE2, SSE3, SSSE3, EM64T

L1 Data cache 2 x 32 KBytes, 8-way set associative, 64-byte line size
L1 Instruction cache 2 x 32 KBytes, 8-way set associative, 64-byte line size
L2 cache 1024 KBytes, 4-way set associative, 64-byte line size
FID/VID Control yes
FID range 6.0x - 8.0x
Max VID 1.238 V