J'ai fais le test avec Aida et mes températures sembles toutes a peu près normales...
En revanche, j'ai utilisé Memtest sur ma première barrette de ram, et au bout d'environ 30min de test, un nouveau BSOD apparait "0x000000A0". Pour le coup (je ne sais pas pourquoi) celui ci m'a bien laissé un fichier dump que j'ai pu analyser via Whocrashed :
Crash Dump Analysis
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Crash dump directory: C:\Windows\Minidump
Crash dumps are enabled on your computer.
On Sun 30/06/2013 16:36:33 GMT your computer crashed
crash dump file: C:\Windows\Minidump\063013-12714-01.dmp
This was probably caused by the following module: ntoskrnl.exe (nt+0x75C00)
Bugcheck code: 0xA0 (0xB, 0xBE75B000, 0x3, 0x9BE6000)
Error: INTERNAL_POWER_ERROR
file path: C:\Windows\system32\ntoskrnl.exe
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: NT Kernel & System
Bug check description: This bug check indicates that the power policy manager experienced a fatal error.
This problem might be caused by a thermal issue.
The crash took place in the Windows kernel. Possibly this problem is caused by another driver that cannot be identified at this time.
On Sun 30/06/2013 16:36:33 GMT your computer crashed
crash dump file: C:\Windows\memory.dmp
This was probably caused by the following module: hal.dll (hal!HalHandleMcheck+0x256)
Bugcheck code: 0xA0 (0xB, 0xBE75B000, 0x3, 0x9BE6000)
Error: INTERNAL_POWER_ERROR
file path: C:\Windows\system32\hal.dll
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: Hardware Abstraction Layer DLL
Bug check description: This bug check indicates that the power policy manager experienced a fatal error.
This problem might be caused by a thermal issue.
The crash took place in a standard Microsoft module. Your system configuration may be incorrect. Possibly this problem is caused by another driver on your system that cannot be identified at this time.
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Conclusion
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2 crash dumps have been found and analyzed. No offending third party drivers have been found. Consider configuring your system to produce a full memory dump for better analysis.
Read the topic general suggestions for troubleshooting system crashes for more information.
Note that it's not always possible to state with certainty whether a reported driver is actually responsible for crashing your system or that the root cause is in another module. Nonetheless it's suggested you look for updates for the products that these drivers belong to and regularly visit Windows update or enable automatic updates for Windows. In case a piece of malfunctioning hardware is causing trouble, a search with Google on the bug check errors together with the model name and brand of your computer may help you investigate this further.
En revanche, je n'ai pas bien saisi ce qu'il me conseillait de faire...en attendant votre prochaine réponse, je vais lancer le test sur ma deuxième barrette de ram.