The Virtual Machine won't pass the necessary information...
MCP55 was also the codename for nForce 570-590 chipsets, which do 300+ HT Reference Clock easy.
nTune had perfect support with the 500 series chipsets on Desktop but quick Google search shows it spotty for nForce Professional boards.
From the NVIDIA website, NVIDIA System Tools has droped MCP55 support but I'm pretty sure I used a version of nTune 5.x on Vista that should work with Windows 7.
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