128bit

Referring to computer architecture with addresses and other data units 128 bits wide.

64bit

A 64-bit architecture is usually a system where addresses (pointers) are 64 bits wide

Number prime factor

Quality Example
Larger

"And i ll just add to previous comment if 128bit number has prime factor larger than 64bit then it certainly has a factor less than 64bit"

from question "Is there an easy way to find two values that, when multiplied together, produce an exact bit pattern?"

"I ll just add that if the 128bit number is prime or has a prime factor larger than 64bit then there will be no solution to your problem"

from question "Is there an easy way to find two values that, when multiplied together, produce an exact bit pattern?"

Transactions faster bit

Quality Example
Faster

"128bit transactions tend to be faster than 64bit which tend to be faster than 32 bit"

from question "Is there a penalty to using char variables in CUDA kernels?"

"Actually on intel sandybridge-family at least mul imul 64bit 64bit 128bit is faster than imul mul 32bit 32bit 64bit"

from question "Implementing school-like division on 32bit chunks on x86"

Others

Quality Example
Faster

"In a benchmark test the 128bit intrinsic function performs faster than the 64bit intrinsic"

from question "_mm_sad_epu8 faster than _mm_sad_pu8"

Slower

"So a 128bit adder will be slower than a 64bit add"

from question "Processor architecture"

More

"Perhaps 128bit distributed-system internet-wide pointers but no more than 64bit in a system call or perhaps even a legacy 32-bit limit"

from question "Size_t vs. uintptr_t"

Math faster

"In a few more years there might be an architecture where 128bit math is faster than 64bit but i don t think any exists today"

from question "Int_least64_t vs int_fast64_t vs int64_t"

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