Many people, myself included, are having issues with their Radeon HD 7950 cards (and others I think) where the fan will spin up to 100% every few seconds while the monitor is in standby.  See this Youtube video of the issue:

 

http://www.youtube.com/watch?v=UWYyfqvKcjI&feature=youtu.be

 

It has now been more than a year since these cards were released, but AMD has not resolved the problem.  Are there any plans to do so?  I experience the problem on Windows 8 64-bit.

The cooling solution is usually made by the manufacturer, AMD provides the GPU only. I suggest you contact the manufacturer and ask them what's up. They may have a solution like a BIOS update or something.

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CPU: AMD Phenom II X4 810 @ 3250MHz | RAM: Kingmax 2x2GB DDR2 800 @ 833MHz| MoBo: MSI K9A2 CF v1.0 (BIOS: 1.D)| GPU: Asus HD 6850 1024MB (DirectCu) @ 850/1100MHz | Display: L24FHD | PSU: PC Power & Cooling Silencer 750 Quad | OS: MS Windows 95 x64 Edition, Lubuntu 13.04

CPU: Pentium 4 Northwood S478 @ 3200MHz | RAM: 1,5GB DDR 400| MoBo: Gigabyte GA-8S661FXMP-RZ | GPU: Abit Geforce Ti 4200 | Display: Dimarson 19" CRT | PSU: Noname 400W | OS: MS Windows XP Pro, Lubuntu 12.04

I believe the HIS card is a reference design, but in any case this issue has been reported across different brands.  See: http://www.tomshardware.com/forum/349900-33-7950-spins-idle

I suggest you contact HIS Support directly.

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CPU: AMD Phenom II X4 810 @ 3250MHz | RAM: Kingmax 2x2GB DDR2 800 @ 833MHz| MoBo: MSI K9A2 CF v1.0 (BIOS: 1.D)| GPU: Asus HD 6850 1024MB (DirectCu) @ 850/1100MHz | Display: L24FHD | PSU: PC Power & Cooling Silencer 750 Quad | OS: MS Windows 95 x64 Edition, Lubuntu 13.04

CPU: Pentium 4 Northwood S478 @ 3200MHz | RAM: 1,5GB DDR 400| MoBo: Gigabyte GA-8S661FXMP-RZ | GPU: Abit Geforce Ti 4200 | Display: Dimarson 19" CRT | PSU: Noname 400W | OS: MS Windows XP Pro, Lubuntu 12.04

Sounds like an issue with Zero Core. What does HIS say?

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Crosshair IV Formula, Phenom II x4 965 w/ Corsair H60, 8 GiB OCZ Platinum DDR3 1600, XFX HD 7970 Ghz, 512GB Vertex 4, 256GB Vector, 240GB Agility 3, Creative X-Fi Titanium w/ Creative Gigaworks S750, SeaSonic X750, HP ZR2440w, Win 7 Ultimate x64

Actually, it looks like AMD may have finally fixed this in the most recent drivers (13.1)