its relative to vNB. Higher GTLREF voltage = higher likelyhood of noise in signal. CPUPLL should generally be about 0.3-0.4v higher than vCC. vTT depends on what vCC and vNB are. Safe limit of vTT would probably be around 115-120% of vCC. Safe limit of CPUPLL, just make sure the differential between vCPU_PLL and vCC are not larger than 0.3-0.4v. Keep vCPU_PLL under 1.7-1.8v if you are concerned.
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