So, I just took one of my Diamond HD 5850's apart to have a look at what kind of GDDR5 it's using so I would know what kind of overclocks to expect. I have the same RAM as the 5870 but I just want to make sure of something. Does the vram need any kind of voltage or timing tweaks if I want to go 1250+ mhz on it? Pic of my card's RAM in the attatchment. Can anyone else with a HD 5850 confirm that other types (brands) of GDDR5 is used?