VGA or HDMI on Dell U2713HM

Hi,
I just bought the Dell u2713hm that supports the 2560x1440 resolution. My laptop (with Geforce GT540M) obviously has only HDMI and VGA port. I will use the monitor only for my job, so Photoshop, Autocad and Rhino (no movies or videogames). I have 2 questions and hope you can help me:
1. HDMI imput seems to be limited to 1920x1080@60Hz, while the VGA reaches 2048x1152@60Hz. You think I have to still use HDMI or I can go for the VGA with a resolution a bit higher?
2. Is there any breakthrough (converter or settings) that let me reach the 2560x1440 resolution with my laptop?
Thanks in advance for the answers

Take a look on wikipedia.org about vga, dvi, hdmi. The biggest difference between vga and hdmi is vga is analog and hdmi is digital. Dvi on the other hand is both and there is an adapter for vga/dvi and one for dvi/hdmi. As quite a few of the older computer only had a dvi connector.
When I looked at wikipedia about vga, I was actually shocked that the resolution went that high. I just assumed it could not handle the extra bandwidth. But I was wrong.
At this point in time there are very few monitors that are capable of going higher than 1080p. But that is changing ever sense Apple came out with their retina displays.
I just checked on Apple's website and it looks like the retina display is  2560-by-1440 and the Sharp 4K monitor is 3840 by 2160. I don't know whats available in the window or linux market for anything higher than 1080p. But I am sure they will follow suit.

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