I already posted this in the ati tray tool forum, but since no one seems to have any clue about my problem, i guess it can be considered as a comment on how ati tray tool works for me (therefore satisfying this forum rules) . Here is the post: I have been looking for quite a while now at a lot of different places, but i guess if i can't find an answer here... it just means i m screwed First of all, i have a hd6970M which works fine, but gets a little too hot for me (around 95°c on furmark, with stock clocks (680/900 at 1.1V) that's why i decided to overclock and downvolt, because i encountered a lot of people who succeded in doing so. After trying a lot of things, i got to 800/1000 at 1.010V that works fine with saphire trix But with ATI tray tool, i can't go over 719/936 at 1.1V (but email@example.comV works) without crashing. I get a red screen with black vertical lines. Even with CCC i can go to 710/1000 without any problems. So why do i crash when i overclock with ATI tray tool when it should work perfectly? I would like to add another post i published on the notebookcheck forum: Hi guys I tried downvolting/overclocking my 6970m, but i encountered some strange problems For the downvolting part, like most of you, or at least for what i have read, i can't go under 0.75V either, take it as a confirmation of what was stated before. Now the interesting part; my problem is that i think Ati Tray tool is not working properly on my system. I tried of lot of voltages and when i try to go as low as possible with the stock clocks something strange happen. I can reach firstname.lastname@example.orgV without any artefact on the 3D renderer and on the furmark bench. But when i try email@example.comV no artefacts or anything it just crashes, i get a black screen for a few seconds, then my desktop partially comes back for a few seconds and it crashes again... I have the same thing at firstname.lastname@example.orgV it crashes at email@example.com but this time i get a red screen... but still no artefacts 0.001V before, which i find really strange, going from working perfectly fine playing the witcher 2 for 1hour (firstname.lastname@example.orgV), to just crashing as soon as i get to 1.000V And with ATI tray tool i can't get my memory clock to go over 945Mhz no matter what the voltage is, it crashes... i can't even get to work fine at email@example.comV with Ati tray tool whereas with CCC i can do it. With sapphire Trix i can even get to 800/1000 without any problems... So i can't figure out why, why can't i get 710/100 to work with ATI tray tool, when it's perfectly stable with CCC... Why do a 0.001V difference crashes without having any artefacts before? I hope this comment might help you correct a bug, if it is one, or simply make the program easier to use by highligting what have to be done (if i didn't do something properly) I also hope i have been clear enough, i would really be grateful to get some feedbacks on that matter.