Dell monitor U2515H only gets 2048 x 1152 with Nvidia GV-N740D5OC-1GI, Windows XP SP3, and HDMI->HDMI

Hi,

Just bought a U2515H monitor and a Nvidia GV-N740D5OC-1GI (Gigabyte GeForce GT 740 OC 1GB GDDR) to get the optimal monitor resolution of 2560 x 1440, but Windows XP SP3 is showing me 2048 x 1152 as the maximum resolution selectable.

I use a HDMI to HDMI cable.

I have installed the lastest Nvidia drivers and contacted Gigabyte support service and they confirmed me that this graphic card has a maximum resolution of 4096 x 2160 @24Hz through HDMI.

Dell does not provide a Windows XP driver for this monitor. May be this an issue?

Please, can you help me out?

Thanks in advance,

Regards,

Sergi Morraja