http://www.wowwiki.com/Resilience

Resilience currently follows a linear return. Where y represents the damage reduction percentage, and x represents the amount of resilience, the linear formulas is as followed:
y = 0.01050120510299x + 0.000605956904
For example, damage is reduced by 15.75% when 1500 resilience is equipped:
15.75241361 = 0.01050120510299(1500) + 0.000605956904
The resilience formula was changed in Patch 4.1.0. Resilience is now not linear and no longer offers increasing returns.

And formulas for 4.1 is:

y = 1 - 0.99 ^ ( x / 79.12785 )
Resilience Cap
The resilience cap is currently 9523. Equipping 9523 resilience will provide 100% damage reduction. Having more than 9523 resilience equipped is overkill and provides absolutely no benefit. However, equipping this amount of resilience is currently impossible. In Patch 4.1.0, diminishing returns on resilience will provide a real resilience cap.
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Что сейчас творится - это жесть, гвноодетые персы имеют 40% абсорба дамага, даже не хилеры. Что будет в фулл арене?

для тех кто в танке - фомула реса изменена в патче 4.1, и теперь чем больше реса, тем меньший абсорб даёт каждая его единица. И 4300 реса должно давать примерно 33%, а не 43% как сейчас