Btw, this is not about turning of exclusive mode. It's instant for everyone if you have EM turned off. This is about the regular alt-tabbing
It's the infamous HCF instruction, which stands for Halt and Catch Fire.
So like, I checked the max operating temperature of my GPU and it's 104 C. That's hotter than boiling water. And I think the i7 2600k can go up to like 105 C if not somewhere in the 90's which is already insane because my chip is supposed to cap off at 62 C but I've taken it to 70 C playing Bad Company 2 on linux through wine. Got into argument with AMD where they were convinced I was overclocking while I haven't overclocked even once.
Just one big warning - it's totally unsupported currently. If something goes wrong with it, you may need to reinstall. It is not an official feature of the game yet.
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DJ Hirko | Lead Programmer of Heroes of Newerth