It's just a different way of writing it.
2x IR is:
2x scale on the x axis
2x scale on the y axis
4x total resolution
4x SSAA is:
2x scale on the x axis
2x scale on the y axis
4x total resolution
IR is written as the scale applied to each axis so the total resolution is the square of that scale.
SSAA is written as the total resolution so the scale is the square root of that.
IR really should be written as the total resolution in my opinion but the option was originally called "efb scale" so listing the scale made more sense at the time. It was renamed to "internal resolution" because people were confused about what it is for but they never changed the numbers to use a more appropriate measurement.
2x IR is:
2x scale on the x axis
2x scale on the y axis
4x total resolution
4x SSAA is:
2x scale on the x axis
2x scale on the y axis
4x total resolution
IR is written as the scale applied to each axis so the total resolution is the square of that scale.
SSAA is written as the total resolution so the scale is the square root of that.
IR really should be written as the total resolution in my opinion but the option was originally called "efb scale" so listing the scale made more sense at the time. It was renamed to "internal resolution" because people were confused about what it is for but they never changed the numbers to use a more appropriate measurement.
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-Ron Swanson
"I shall be a good politician, even if it kills me. Or if it kills anyone else for that matter. "
-Mark Antony