Huge dps cap between item levels

[Deleted]

Using simulation craft at 490 item level I am estimated to pull 75k realistic dps on a training dummy as a balance druid which I can achieve but I am simply confused to see that a gap of only 20 item level 490 - 510 and people are pulling more than double that dps in raids, does the dps really ramp up that much from the gear changes?
or maybe I am doing something wrong, satisfy my confusion please.

[Deleted]

Well it also depends on encounters, i would say 20 itemlvls ahead of 490 certainly won't pull 150k steady dps on a training dummy. And neither on single target without gimmicks. The dmg does ramp up quick, because we scale very well with all secondaries and intellect.

[Zareth]

To give you a rough estimation, the T14 BiS suggests 108k DPS and the T15 BiS suggests 195,5k DPS. Yes, there is a huge difference in item levels, and especially weapons.

[Kuniku]

dont forget that you dpsing a target dummy is likely only your own buffs, in raids they'll have all the buffs and debuffs up!