I have Win7 running on an older compaq laptop with a single core 1.6 Pentium M CPU, a Radeon Mobility 9600 Graphics chip, and only 768MB of ram, and it is quite quick....she does everything on it without any issues. My next experiment will be loading it onto my PIII 933mhz garage PC with 512 ram....and I bet it will be fine. It is amazingly adaptable to older hardware.

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'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
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'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)