in reply to Re^5: How to find out if it is 32bit or 64bit windows?
in thread How to find out if it is 32bit or 64bit windows?

that equated to 64 bits of precision for the mantissa, and 16 bits for the exponent and sign - the remaining 2 bytes being unused

Ah! That makes a (little) sense of it.

It'd be interesting to see a quick comparison of the performance of 64-bit .v. 80-bit .v. 128-bit. The latter must be an order of magnitude or more slower than the other two?

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