OK, so after promises and more promises, I'll show how to OC and turn it into an 8870m
. Here we go:
1-Download and install the latest MSI Aterburner software:
http://download.msi.com/uti_exe/vga/MSIAfterburnerSetup300Beta19.zip
2-Download atiocdll.zip which contains the required libraries and MSIAfterburner.cfg (don't worry, these files are 100% clean):
https://mega.co.nz/#!2cUllKyI!jTT03nLL5-1qvXK5xr3kxfdpKyIPqjkSlKF56FEJ6lw
https://mega.co.nz/#!yFs0jLCJ!lp6WJBDy2-g6GEJmQ-sbb9-vNzmpp9C7G6IIG1tu564
3-After installing MSI afterburner, open the application and then close it. Then go to the installation folder (usually "C:\Program Files (x86)\MSI Afterburner") and then replace the MSIAfterburner.cfg file already existing there with the one I posted, you'll be asked to confirm the overwriting, accept it. Also copy the .cfg file into Profiles folder and accept overwriting if prompted.
3-Download and extract atiocdll.zip. There are two DLLs, "atipdl64.dll", which you must place in C:\Windows\System32, and "atipdlxx.dll", which you have to move to C:\Windows\SysWOW64.
4-Now go to Registry Editor (regedit from Run command) and seek this folder:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0000
Open it, search for "EnableCrossFireAutoLink", "EnableUlps" and "EnableUlps_NA" keys and set their values as 0.
5-Reboot. When you open MSI Afterburner, you'll see that Core Clock and Memory Clock sliders are now unlocked, so is the "Max" box, so you can just directly type a numeric value instead of dragging sliders. I recommend setting 725 MHz on Core (750 also works, but it's not 100% stable, anything higer than that isn't), and 1125 MHz on Memory, these are safe clocks.
Don't worry about higher clocks, as they will lowered to 150 MHz (core) and 300 MHz (Memory) when the GPU is idle, but will revert back to higher levels when it's needed, like when gaming.
6-I really recommended installing Catalyst 14.4 WHQL modded by a guy on guru3D forums, because it increases perfomance in systems with Switchable Dynamic Graphics (Enduro) as used by Dell Inspiron 15R laptops, and also on DX9 games. I can post the link and another tutorial on how to install it in another occasion.
7-Enjoy
, any doubt you have, feel free to contact me here or via PM.