What's the deal? This thread is created to poll people together who have modified/altered their bios to reduce: -Memory clock rate -GPU voltage, lower then 1.263 in low 2D mode Purpose The purpose of this thread is to formulate, create and obtain information and bios/bios tweaks to create a single bios for everyone. Let me repeat this, one stable, trouble free bios for all 4870 users. A bios that is proven to reduce GPU voltage and memory clock rate. Some bioses do not allow for lower GPU voltage even though they read lower then 1.263. Therefore, a multimeter would be needed to verify that the voltage is lower then 1.263 (aka the voltage you set it at). Ideas -confirmed gpu voltage lower then 1.263 in 2d mode -leave the second 2d mode AKA UVD mode alone unless absolutely sure that a lower voltage doesn't affect movie playback, etc -a gpu clock lower then 500MHz isn't IMO necessary. Lowering the actual gpu voltage should be a priority -lower the memory clock rate in 2D mode then to it's native clock in 3D mode as this does not exist in the 4870 as it does for teh 2900 and 3870 and earlier cards -make sure that using other Cat drivers doesn't adversely effect your card when you using standard or overclock settings to play your games -no wired artifacts or anomalies are tolerated Software you may need Radeon Bios Editor v1.20 GPU-Z v0.3.3 Use GPUz to save your current bios ATIFlash 3.60 ATI Tray Tools You may need to create a CCC profile with just the fan information (no gpu or memory information) to bring the fan back up to speed. Kill-A-Watt AND/OR Multimeter Look here for VDDC Measure. Disclaimer: Once a bios is created and confirmed by several users to work as purposed (or any other bios and or method to measure voltage, etc) then you use it at your own risk. There is still no guarantee that it will work properly with your video card. As with any bios update there is a level of risk involved and you will assume this risk if you venture in replacing your bios. As a precaution, make a backup copy of your bios and keep a PCI video card handy as a backup as they are cheap. Results so far This is for reference 4870s only. None reference video cards will not work with this bios. I believe you have to use: atiflash -f -p 0 Sapow.bin to force flash it.