The combined computing power of all the world's supercomputers is estimated to be around 1.5 exaFLOPS, or 1.5 quintillion floating point operations per second. This is equivalent to the computing power of approximately 100 million desktop computers.
Quantum computers have the potential to be exponentially more powerful than traditional computers, with the ability to perform calculations at a rate of 10 to the power of 80 operations per second. This is significantly higher than any current supercomputer and could potentially solve complex problems that are impossible for traditional computers to solve.
There are currently no computers with unlimited processing speed, as there are physical limitations to how fast data can be processed. However, theoretically, a computer with unlimited processing speed would be able to perform an infinite number of calculations in an infinitely small amount of time.
A computer with a terabyte of RAM (random access memory) would have a storage capacity of 1 trillion bytes. While this may seem like a large amount, it is not uncommon for high-end computers to have several terabytes of RAM.
A computer with a petabyte of storage would have a storage capacity of 1 quadrillion bytes. This is equivalent to about 13.3 years of HD video or 20 million filing cabinets filled with text documents. However, the amount of computing power would depend on the speed and processing capabilities of the computer, not just the amount of storage.