What servers does Samaritan run on?

What servers does Samaritan run on? - Woman With White Sunvisor Running

In Person of Interest, the Machine is shown to be running on a on IFT Sabre Blade 2437 servers which are renamed Dell PowerEdge SC1425 servers. At the end of season 3 we can see server farms with Samaritan's servers. Does anyone know which real life models are shown there?

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What servers does Samaritan run on? - Women in White Dress Running on Green Grass Field

What servers does Samaritan run on? - From below back view of crop strong runner walking along running track in athletics arena while doing warm up exercises during workout

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