Problems between the GPU and the fans

Hello !
I've got an iMac 21,5" with 3,2 GHz Intel Core i3. My GPU is an ATI Radeon HD 5670 with 512 MB of VRAM.
I recently noticed that when i'm running a game and when at the same moment the fans are used around 2000rpm the performances of the GPU are strongly reduced. I ran Cinebench 11.5 so as to know a little more about that and there are the results :
- With the fans : 8 fps
- Without the fans : 30 fps.
Is it normal ?
Thanks for help

Hello, doesn't sound normal to me!???
Get Temperature Monitor to see if it's heat related...
http://www.macupdate.com/info.php/id/12381/temperature-monitor
iStat Menus...
http://bjango.com/mac/istatmenus/
And/or iStat Pro...
http://www.islayer.com/apps/istatpro/
Here's my temps on a cool day, not doing much...
Especially interesting will be the GPU & CPU temps.

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Photoshop CS6 GPU FAQ
Introduction
This document provides a quick reference guide to video card usage in Photoshop. Some features require a compatible video card to work; if the video card or its driver is defective or unsupported, those features will not work at all. Other features use the video card for acceleration and if the card or driver is defective those features will run more slowly.
Mercury Graphics Engine
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GPU features added in Photoshop CS6
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Liquify (accelerated by compatible video card with 512MB VRAM, GPU mode unavailable on Windows XP)
Oil Paint (compatible video card required)
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Lighting Effects Gallery (compatible video card required with 512MB
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New 3D enhancements (3D features in Photoshop require a compatible video card with 512MB VRAM, unavailable on Windows XP):
Draggable Shadows
Ground plane reflections
Roughness
On-canvas UI controls
Ground plane
Liqht widgets on edge of canvas
IBL (image based light) controller
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GPU features added in previous versions of Photoshop
Scrubby Zoom. See Zoom continuously
Heads Up Display (HUD) color picker. See Choose a color while painting
Color sampling ring. Choose colors with the Eyedropper tool
Brush dynamic resize and hardness control. See Resize or change hardness of cursors by dragging
Bristle Brush tip previews. Bristle tip shape options
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Pixel grid. Hide the pixel grid
Adobe Color Engine (ACE).
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Adobe Bridge GPU features
Preview panel
Full-screen preview
Review mode
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Turn off OpenGL.
Choose Edit > Preferences (Windows) or Photoshop > Preferences (Mac OS).
In the Performance panel, uncheck Use Graphics Processor. Click OK.
Restart Photoshop, and perform the same function.
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Close all documents.
Choose Edit > Preferences (Windows) or Photoshop > Preferences (Mac OS)
In the Performance panel, click the GPU Settings Advanced Settings button.
Choose Mode > Basic
Restart Photoshop.
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If you are using more than one video adapter, remove the additional cards.
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Note: Using two video adapters does not enhance Photoshop's performance.
Check your Cache Levels setting.
If you've set your Cache Levels to 1 in Photoshop preferences, you can experience performance issues with GPU features. Reset Cache Levels to the default setting, which is 4.
Choose Edit > Preferences > Performance (Windows) or Photoshop > Preferences (Mac OS)
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The first time the sniffer fails, Photoshop will display a dialog indicating that it has detected a problem with the GPU. On subsequent launches the dialog will not appear unless the Photoshop preferences are reset.
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Adobe tested the following video cards before the release of Photoshop CS6. This document lists the video card by series. While the minimum amount of VRAM supported on video cards for Photoshop CS6 is 256MB, some features require 512MB of VRAM to be enabled.
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AMD/ATI Radeon 2000, 3000, 4000, 5000, 6000, 7000 series
AMD/ATI FirePro 3800, 4800, 5800, 7800, 8800, 9800, 3900, 4900, 5900, 7900
Intel Intel HD Graphics, Intel HD Graphics P3000, Intel HD Graphics P4000
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Hi,
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Thanks.
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I managed to solved this by
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CK

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Dear Customer,
Welcome and Thank You for posting your query on HP Support Forum
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