I'm planning to use 2x Dell U2515H monitors with my 15" mid-2015 Macbook Pro 2.2Ghz (model number A1398) with Intel Iris Pro Graphics. According to Apple, it can drive:
Dual display and video mirroring: simultaneously supports full native resolution on the built-in display and up to 3840x2160 pixels on up to two external displays, both at millions of colours.
Additionally, the HDMI video output van:
Support for 4096x2160 resolution at 24Hz
Will I be able to drive two of these bad boys at native resolution of 2560x1440?