Does every point of intelligence matter?

[Roman]

Originally Posted by Kings Bounty Hunter

If every point of intellect gave your spell a 10% increase then at level 21 your spells would be increased by 210%

You work it out

Not necessarily - that depends on whether the percentage increases are additive or cumulative. If they are additive, the increase due to intelligence 21 would indeed be 210%, but if the increases are cumulative, it would be approximately 640%.