More like 3.0e16 sha-256 computations per second (each Bitcoin hash involves two sha256 calculations), but the HLT idle command is a clear winner.

Assume: HLT idle is 1 clock cycle
Assume: Typical PC is idling at 1 GHz

PC shipments were 350m in 2010. If even 1 billion PCs are on and idle 60% of the day, then we have:

0.6 * 1 billion * 1 GHz * 1 year = 1.9e25 iterations per year

versus

3.0e16 Hz * 1 year = 9.5e23 iterations per year for Bitcoin

Now, sha256x2 is much more complicated than HLT, but the OP asked for iterations.

That's why I use VIM. It removes the possibility of evil. :P

You really should re-train yourself to use ":x" - you could be saving an entire keystroke per IM message!

Apparently the term "nano-scale" means that your manufacturing process has features measured in nm. Even if that is 400 nm or 1000 nm it seems. Example: https://nano-cemms.illinois.edu/materials/3d_printing_full Quote 1: " . . . incredibly thin polymer layers (on the order of 400 nm) . . . " Quote 2: "This activity demonstrates the basic challenges of nanoscale engineering and manufacturing."