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Alright, after quite a long while, here's an update on the matter.
Our father convinced us to just buy a new PC and give the old one to him, and so we did. We replaced my brother's PC 2 days ago, and things were looking bright. However, it didn't last long...
Well, not another random freeze (So far at least), but now any online game he plays randomly force-close with message "Display driver AMD driver stopped responding and has recovered" every hour, sometimes even within minutes. I researched quite a bit, and it seems that this is a mysteriously persistent problem with no definite solution (i.e. what solves the problem for someone doesn't always work for someone else).
I feel really... bad about this. It just seems like my brother is destined to only have problematic things.
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Updated GPU driver to the latest version by clean-uninstalling the previous one first.
Change theme from Windows Aero to Basic
Disabled the built-in GPU from the mobo.
Added TdrDelay Qword in registry.
Pretty much nearly all things mentioned in any threads I found. None worked.
As for testing, there's the recently released World of Warships. This problem occurs most often in this game, often within minutes. So I'll quickly know if the problem persist.
I'm thinking of downgrading the GPU driver, since there are people saying that newer driver often introduce new issues, but how far should I go back? The GPU is AMD r7 200 Series this time, with driver version 15something. The thread I read recommended going back to 13.1, but I worry on the compatibility.
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After reading a few threads out there, I tried using Catalyst Control Center's AMD Overdrive feature to underclock the GPU 3 days ago.
Worked wonders so far. For testing purpose I once tried overworking the PC by pulling an all-nighter playing World of Warship. Did not occur at all, and the game still runs well.
So I think I can say that this is solved, hopefully.
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Hmmm, are you using the new PSU that you got for your brother last year?
If not, Wade is right and the PSU may be underpowered. Otherwise, it could be the RAM not being able to cope.
The Best Medicine > Magic. Because SCIENCE! can prove the former.
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I admit that I forgot to mention anything about PSU when I placed the order, so the shop guy probably used default PSU, which is 450W again.