A: Graphics Processing Unit/GPU use AMD & AMD The $4000 unit uses Dual AMD FirePro D700 and has 25 megabytes cache memory as opposed to 10& 12 It is also EPEAT Qualified (?) https://www.bestbuy.com/site/compare?skus=2680034,9101072,2680016&productString=**&url=%2Fsite%2Fsearchpage.jsp%3Fcp%3D1%26searchType%3Dsearch%26_dyncharset%3DUTF-8%26ks%3D960%26sc%3DGlobal%26list%3Dy%26usc%3DAll%2520Categories%26type%3Dpage%26id%3Dpcat17071%26iht%3Dn%26seeAll%3D%26browsedCategory%3Dpcmcat268200050003%26st%3Dcategoryid%2524pcmcat268200050003%26qp%3D%26sp%3D-currentprice%2520skuidsaas
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