Zatial som mal najviac 4 monitory na jednom PC, cez dve GeForce 8800GTX. Potrebujes na to motherboard s dvoma pci express slotmi a silny zdroj.

No ty potrebujes nieco viac. Kedze bezne graficke karty maju vystup max na dva monitory (aj ked niektore maju 3 vystupy, tak byvaju na 2 monitory) a neviem ci byvaju motherboardy s 3x pci express ...

Takze asi skor nejaku exoticku grafiku s viacerymi vystupmi, google mi nasiel taketo:

NVIDIA NVS 450 PCIE x16; Capable of supporting up to four digital displays at resolutions of up to 2560 x 1600 each ... zvlastne ze tomu staci 35W a ma to pasivny zdroj, asi to nebude moc vykonne:
http://www.pny-europe.com/products.php?section=product&categoryid=8&subcategoryid=103&productid=284

Galaxy GeForce GTX 560 Ti MDT X5 features 4 Mini-HDMI outputs plus one Dual-link DVI & DP output allowing the user to connect up to five monitors to a single graphics card in 2/3/4 + 1 span mode
http://www.newegg.com/Product/Product.aspx?Item=N82E16814162082

Alebo zeby dve lepsie grafiky, a dve taketo krabicky, ktore ti rozdelia obrazy na tri monitory?

Supports a maximum resolution of 5760x1080 (3x 1920x1080)1, 2 across three monitors; displays attached to TripleHead2Go must run at the same resolution
http://www.matrox.com/graphics/en/products/gxm/th2go/#close