Bad image quality when connecting an external Dell 30" monitor. Why?

I recently bought the latest Mac Book Pro Retina 15. It's running the nVidia M750 2gb card I believe.
I'm trying to hook it up to my Dell 30" desktop monitor which runs my desktop computer perfectly well. I'm using a cheap Mini Displayport to Displayport cable which to do this. It's working except the image is slightly fuzzy, as though the resolution is just a couple pixels off native res. Could it be the cable being cheap? (I couldn't find proper ones when I bought this one) Or should I be connecting the screen via a different method? I obviously need the full 2560 x 1600 resolution.
Thanks,
Simon

Sure.
Here are the specs on a Moshi Mini DP to HDMI Adapter
You can see Supports full HD display at 1080p (1920 x 1080).
So no go there...
Altaz Mini DisplayPort to DisplayPort Adapter for Apple MacBook
So that would work for you. Review on link:
I recently bought one of these to try out with an Apple unibody (late 2008) MacBook Pro and a Dell 3008WFP 30" display.
Dell's web site advertised the 3008WFP as requiring Dual Link DVI to work at full resolution (which is certainly partly true, as normal DVI can't drive 2560x1600 displays). Given that DisplayPort is rated up to 2560x1600 I was hoping that this adapter would allow my MBP to drive the display at full resolution without requiring Apple's MiniDisplayPort to Dual Link DVI converter.
It works flawlessly for me.
So make sure you look for a cable that is rated above 1920 x 1200.
There are some examples here: http://daggle.com/macbook-run-2560-1440-monitor-2324

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Attachments:
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In both InDesign and Illustrator, scaling the image in the document affects the ppi of the image, scaling down would increase the ppi whereas scaling upward would decrease the ppi as the number of pixels (the pixel dimension) has not changed.
With photoshop, you have a choice, when scaling the entire document, you have the option to resample the image, doing so affects the pixel dimension and in that instance would degrade the image when scaling downward and bluring the image when scaling up. As photoshop is removing pixels when scaling down and guessing the neighbor pixels should be when scaling upward.
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inches x ppi = pixels
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Bad image quality when connecting an external Dell 30" monitor. Why?

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