The strength of your votes on EA Forum depends on your karma; if you have more karma, your upvotes will increase the score of things you upvote by more.

Normal votes (one click) are worth

• 2 points – if you have 1,000 karma
• 1 point  – if you have 0 karma

Strong votes (click and hold) are worth

• 16 points (maximum) – if you have 500,000 karma
• 15 points – 250,000
• 14 points – 175,000
• 13 points – 100,000
• 12 points – 75,000
• 11 points – 50,000
• 10 points – 25,000
• 9 points  – 10,000
• 8 points  – 5,000
• 7 points  – 2,500
• 6 points  – 1,000
• 5 points  – 500
• 4 points  – 250
• 3 points  – 100
• 2 points  – 10
• 1 point – 0