The Galaxy MDT GeForce GT 520 is certainly a unique product in the sense that it does what no other GT 520 can: support up to four monitors. Standard cards are limited to just two monitors, as is the case with all GeForce 500 series (and earlier) cards. Truth be told, Nvidia's multi-monitor technology is a little lacking, as it requires two cards in SLI to drive three monitors.
By comparison, AMD Eyefinity can support three displays with a single card, while certain high-end cards can power up to half a dozen monitors. This presents a challenge for Galaxy's product, as we can't help but feel those wanting to utilize four monitors for non-gaming purposes would be better off with an Eyefinity-capable graphics card such as the Radeon HD 6450.
Additionally, cards with a DisplayPort 1.2 connector can in fact drive up to four separate monitors. Using a Multi-Stream compatible hub with DP1.2 capable monitors it is possible to connect four screens to a single DisplayPort connector. We know of HD 6450 cards from HIS and Sapphire that feature a DisplayPort 1.2 connector and can therefore support four displays.
To be fair, we like the MDT GT 520's simplicity; installation and setup is extremely easy. Eyefinity can be more powerful, but it is not always the easiest technology to use, requiring a greater understanding of video outputs. Galaxy also claims two of its cards can be used to drive eight monitors, which is quite a big deal. Few affordable setups support such a vast array of screens.
Despite all of that, there is a deal breaker: the price. Now keep in mind, the HD 6450 can be had for as little as $55 and all versions support three 2560x1600 monitors while DisplayPort versions can handle four. Meanwhile, a standard dual-display-capable GT 520 is in the same ~$55 territory. Galaxy's quad-display MDT edition, however, is set at an unfathomable $130!
Not only is that over double the HD 6450's retail rate (and half the speed), but it's more than you'll pay for an HD 6750, which is $100-$110 and is available with quad-display support via several manufacturers including PowerColor, XFX, Sapphire and HIS. To wrap it up, the MDT GT 520 is too slow, limited to 1920x1200, unsuitable for low-profile systems and costs far too much.
Pros: Supports up to four monitors, easy installation and setup.
Cons: Not the best value, more powerful alternatives from AMD available for half the price, limited to 1920x1200, unsuitable for low-profile systems.