which DVI port to use ?

1 monitor and both ports are the same DVI but dual ink, does not matter, you answered your own question :p
 
single link can handle up to 1920x1080 or 1080p, whereas dual link(DVI-D or DVI-I) can handle up to 2560x1600
http://en.wikipedia.org/wiki/Digital_Visual_Interface
DVI-D (digital only, single-link or dual-link)
DVI-A (analog only)
DVI-I (integrated, combines digital and analog in the same connector; digital may be single- or dual-link)

The DVI-D and DVI-I connector provide (via additional pins) for a second data link. This allows resolutions up to 2560x1600, which are supported by many add-on graphic cards. A connector with these additional pins is sometimes referred to as DVI-DL (dual link).

this does depend overall on the Hz and bitrate as they can go much higher example
Example display modes (single link): HDTV (1,920 × 1,080) @ 60 Hz with CVT-RB blanking (139 MHz)
UXGA (1,600 × 1,200) @ 60 Hz with GTF blanking (161 MHz)
WUXGA (1,920 × 1,200) @ 60 Hz with CVT-RB blanking (154 MHz)
SXGA (1,280 × 1,024) @ 85 Hz with GTF blanking (159 MHz)
WXGA+ (1440 × 900) @ 60 Hz (107 MHz)
WQUXGA (3,840 × 2,400) @ 17 Hz (164 MHz)

Example display modes (dual link): QXGA (2,048 × 1,536) @ 75 Hz with GTF blanking (2 × 170 MHz)
HDTV (1,920 × 1,080) @ 85 Hz with GTF blanking (2 × 126 MHz)
WUXGA (1,920 × 1,200) @ 120 Hz with CVT-RB blanking (2 x 154 MHz)
WQXGA (2,560 × 1,600) @ 60 Hz with GTF blanking (2 × 174 MHz) (30-inch or 762-millimetre Apple, Dell, Gateway, HP, NEC, Quinux, and Samsung LCDs)
WQXGA (2,560 × 1,600) @ 60 Hz with CVT-RB blanking (2 × 135 MHz) (30-inch or 762-millimetre Apple, Dell, Gateway, HP, NEC, Quinux, and Samsung LCDs)
WQXGA (2,560 × 1,600) @ 60 Hz with CVT-RB blanking (269 MHz) (This is for high end monitors when operating at greater than 24 bits per pixel.)
WQUXGA (3,840 × 2,400) @ 33 Hz with GTF blanking (2 × 159 MHz)

anyways point is, if you are using a monitor up to 2560x1600 and are using a good quality cable that is not the length of your house, you should be fine using either port :)
 
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