Intelligence/Fallout 4

Intelligence is one of the seven primary statistics in the SPECIAL system.

Gameplay
Unlike in previous games, Intelligence has no effect on skills, since Fallout 4 lacks a separate set of scores for skills. Instead, a higher Intelligence—in addition to unlocking higher perks in the Intelligence category—will increase the amount of experience the player character earns from all sources. A higher Intelligence also reduces the number of words that are displayed while hacking a terminal.

The experience multiplier linearly increases from 103% (1 Intelligence) to 130% (10 Intelligence). In other words, it increases XP gains by 3% per INT. It continues increasing if Intelligence is brought higher than 10. In math terms:
 * $${\it XP}_{\rm Final} = {\it XP}_{\rm Base}\times \left(1 + \frac{{\it Intelligence} \times 3}{100}\right)$$

Permanent

 * Level (+1)
 * Intelligence Bobblehead (+1)
 * You're SPECIAL! book (+1)

Temporary

 * Armor and clothing
 * Liam's glasses (+2)
 * Lab coat (+2)
 * Press cap (+1)
 * Road goggles (+1)
 * Ushanka hat (+1)
 * Mechanist's helmet (+1)
 * The Captain's Hat (+2)
 * Inquisitor's cowl (+1 up to +4)
 * Legendary armor effects
 * Chems
 * Berry Mentats (+5)
 * Mentats (+2)
 * Daddy-O (+3)
 * X-Cell (+2)
 * Perks
 * Night Person (+2/+3 at night)
 * Settlement objects
 * Vault 88 overseer's desk (+1)

Decreasing

 * Dirty Wastelander
 * Beer

Video
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