You added a device id filter :-P After I removed it, I see some data for my 5970s but nothing for my 5870:


Device [7]: Hemlock [ATI Radeon HD 5900 Series]
        Current core voltage: 1.0375 V
        Presets: 0.9500 / 1.0000 / 1.0375 / 1.0500 V
        Core power draw: 56.61 A (58.74 W)
        VRM temperatures: 84 / 86 / 86 C


Device [15]: Hemlock [ATI Radeon HD 5900 Series]
        Current core voltage: 1.0375 V
        Presets: 0.9500 / 1.0000 / 1.0375 / 1.0500 V
        Core power draw: 53.13 A (55.12 W)
        VRM temperatures: 91 / 94 / 92 C


Device [16]: Radeon HD 5870 (Cypress)
Unsupported i2c device (1a)