Upgrade system to 10.9.5, Install clear system on a new HD , replace video card to ATI HD 7970 3GB or ATI R9 280 3GB you can easy find cards on eBay.ATI HD 480 4/8GB also running good but only with 10.13. here you can buy in Berlin https://www.ebay.com/usr/mac-factory...p2047675.l2559 I bought last time 4 cards. Install second SSD for system, but would be better make RAID for video files. If you have Software Key V4 use http://samsc.co/showthread.php?2317-m466B-v4 or http://samsc.co/showthread.php?2444-...-25th-Jul-2015 if possible! Have Fun!!