Set Internet Explorer 9 IE 9 Cache Size With Registry Setting

HKEY_USERS\ntuser\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\Cache\Content

A "CacheLimit" REG_DWORD entry already exists here in hex form.  You will need to convert the setting you want from decimal to hex.

Open windows calculator (windows key and type calc and then enter) on the computer and enable Scientific Mode (View -> Scientific or press alt+2 ). Type the size of the cache that you want to set in kilobytes.  For example, if you want 8 megabytes, you will enter 8 * 1024 (you multiply by 1024 because this is kilobytes). This results in 8192KB.  Click the Hex option. This will returns "0002000". This is the number you would then enter in the "CacheLimit" registry setting to set the maximum cache size for Internet Explorer in the registry.

If you are running within a Windows 2008 Server environment and need to set a group policy for this cache setting, you can do so by using this same registry setting without having to deploy an administrative .adm template. 

- Open gpmc.msc, right click on the group policy you want to edit, and select edit.

- Expand User Configuration -> Preferences -> Windows Settings -> Registry.

- Right-click on Registry and select New Registry Item.

- On the New Registry Properties window, make sure you leave the Hive setting to HKEY_CURRENT_USER

- Set the Value name to: CacheLimit and set the Value Data to a hex value for the cache size you want to deploy as a GPO.