Dual DVI Monitors at  Aluminum MacBook 13"

Hi,
I want to buy a 24-inch display and I am wondering if I can use it with this setup:
1.
Macbook 5,1 (Aluminum, late 2008)
with NVIDIA GeForce 9400M
and Mini DisplayPort
and Mini DisplayPort to DVI Adapter
2.
ViewSonic 20-inch with DVI-D input 1600x1200@60Hz
3.
Some 24-inch with 1920x1200
Do I need another Adapter to use both Displays, the 24-inch and the 20-inch?
Do I need another Adapter to use only the 24-inch, without the 20-inch?
What ports would be best for the yet to be bought 24-inch? DisplayPort?
Thanks in advance for your replies!

You don't need Apple's dual-link DVI adapter, in fact I would avoid that adapter unless you really need it (because of its cost and for compatibility reasons). Since all of the displays you plan on connecting to run at 1920x1200 or less you only need standard (single-link) DVI. Dual-link doesn't allow you to connect simultaneously to two displays, it just supports higher resolutions (anything beyond 1920x1200).
Here is a link that describes the differences between single-link and dual-link DVI:
http://www.datapro.net/techinfo/dvi_info.html
If you need to drive two external displays simultaneously you probably want one of the third-party dual-head adapters. Here is a link to one such product:
http://www.matrox.com/graphics/en/products/gxm/dh2go/
There are also USB-based display drivers (as the previous post noted), but you may find the performance of those products somewhat lacking.

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