First, it supports four monitors. However, you need to buy "active" adapters if you want good 4k video quality. The supplied adapters are passive. You'll also need to buy them if you want to support more than one 4k monitor. The manufacturer says it supports two 4k monitors with passive adapters enabled, but that's wrong - it only supports one 4k monitor with passive adapters (all other outputs are output at 1080p). You'll need to buy four active adapters if you want all of your 4k monitors to be good quality with no lines crossing the screen. I tried using a passive adapter with three active adapters and the 4k screen on the passive adapter was very poor quality with lines crossing the middle. When I use four active adapters, the card works fine. The picture quality is beautiful.
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