Using two external displays that are NOT mirrored

i have a MBP early 2008, meaning the external display port is a dual DVI-I port. I have have two external displays, both samsung syncmaster xl2370 with native resolution 1920x1080. i have a dual dvi-i to vga splitter. when i connect both displays, they mirror one another, which is not what i want. rather, i want to have my MBP display, and two external displays that are not mirror images of one another. according to apple, if i buy a dual dvi-i to dvi splitter, i get the same effect. i've read on various forums about hardware alternatives, like buying a usb to dvi or usb to vga adapter, with some reasonable results (except a bit of sluggishness). the best one seems to be the diamond: http://www.diamondmm.com/BVU195.php
it mostly gets good reviews, but is sluggish. does any know of any better options?
many thanks, jovo

Welcome to Apple Discussions!
USB is slow partly because it is processor and driver dependent. Best to go with a straight video solution, such as Matroxes products like this one: http://www.matrox.com/graphics/en/products/gxm/dh2go/

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