About the HDMI/DVI issues, heres an overview of my (possibly incorrect) understanding, for those wondering (Note the resolutions listed can be fudged a bit by messing with display rate, ie it may be possible to get a single link dvi to display 2440
1400 @ 33hz) DVI-A/I/D Single link supports up to around 1920x1200
* DVI-I/D Dual Link supports 2560x1600+
* HDMI * HDMI 1.3 supports up to 2560x1600
* HDMI 1.4 supports up to 4096×2160
* HDMI1.3 intro'd different category cables, cat1 and cat2 (Sometimes called 'High Speed'). cat2 supports the higher res.
HDMI and DVI Single Link are compatible (you can get simple adaptors and hdmi-dvi cables). Note, single link only, ie HDMI to DVI adapter connected to a dual link cable and display will be act like DVI Single Link
HDMI w/Type B connector and DVI Dual Link are compatible, however as far as I know there were no HDMI Type B products ever made.
So you cannot convert HDMI>DVI to achieve 2560x1600
* To get 2560x1600 over DVI, you need a dual link card, display and cable
* To get 2560x1600 over HDMI you need a card with a >1.3 port, display and a >1.3 cat2 cable.
* Additionally, regardless of the HDMI standard supported by your card, it may not be capable of outputting 2560x1600 (The presence of a display port or dual link DVI is a good indicator)
So in theory most modern setups should support 2560x1600 over HDMI. In practice not so much, a few problems:
* Some displays and adaptors may claim to support >1.3, or not specify the version, and actually be * Some displays and adaptors may be >1.3 but limit what they will output or display.
* Some displays may be >1.3 but report a lower max resolution in their EDID. Bypassing this/setting a custom mode may work just fine.
* Even if you do manage to get everything working together, you may experience general instability and errors.
TL;DR avoid HDMI for high resolutions if you can, it'll save you a lot of hassle.