HDMI with resolution 2560 x 1440 possible?

I have an Acer 1810T and am going to buy a Dell u2711 with a resolution of 2560 x 1440.

Can I connect the panel over HDMI with the Acer and use the 2560 x 1440 res?

According to this article on Wikipedia, it should be fine if your Acer supports HDMI 1.3.

HDMI version | 1.0-1.2a | 1.3 | 1.4
Maximum signal bandwidth (MHz) | 165 | 340 | 340 [50]
Maximum TMDS bandwidth (Gbit/s) | 4.95 | 10.2 | 10.2
Maximum video bandwidth (Gbit/s) | 3.96 | 8.16 | 8.16
Maximum audio bandwidth (Mbit/s) | 36.86 | 36.86 | 36.86
Maximum color depth (bit/px) | 24 | 48[A]| 48
Maximum resolution over single link at 24-bit/px[B]| 1920×1200p60 | 2560×1600p75 | 4096×2160p24
Maximum resolution over single link at 30-bit/px[C]| N/A | 2560×1600p60 | 4096×2160p24
Maximum resolution over single link at 36-bit/px[D]| N/A | 1920×1200p75 | 4096×2160p24
Maximum resolution over single link at 48-bit/px[E]| N/A | 1920×1200p60 | 1920×1200p60

HDMI 1.3 supports resolution 2560x1600 at 75Hz at 24 bits/pixel, and 60Hz at 30 bits/pixel.

Dell documentation states that the U2711 HDMI port is (internally) limited to 1920x1080.

I made my Dell U2711 work at 2560x1440 over HDMI, by pointing xorg.conf to a custom EDID file someone created.

...

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "DELL U2711"
    HorizSync       30.0 – 81.0
    VertRefresh     56.0 – 76.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce 8400M GS"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "TwinView" "0"
    Option         "CustomEDID" "DFP-1: /home/dlawson/u2711/dell_u2721_custom.edid"
    Option         "metamodes" "DFP-1: nvidia-auto-select +0+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

It's an older thread but I thought I would add my two cents in. Running Windows 8.1 RTM on a Retina Macbook Pro which has a NVIDIA GeForce GT 650M connected to a Dell U2711 via HDMI I managed to get it working by creating a custom resolution using the following settings (note the CVT Reduced Blank selection):

The monitor info now shows resolution as "2560x1440@60Hz". The following post helped: 2560x1440 or 2560x1600 via HDMI