Speedfan would allow you to decrease the maximum speed of your fan (assuming the controller chip is compatable) but you can't make the fan go faster than its design maximum, which yours are probably running at now.
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Please click the link below for your operating system to download the TSG SysInfo Utility. Click on "Save File" then double-click the file to run it. Copy and paste the report in your initial post. Windows 7 and later (downloads a file named tsginfo.exe) | Windows XP (downloads a file named SysInfo.exe)
