first of all i'm sorry for my "bad" english - i'm not a nativ english speaker.
Last friday I bought and configured 2 new computers in seperate parts for me and my girlfriend. Both computers are almost identical except for the hdd's and dvd drives we took from our old computers.
You can see our new configuration here: Mindfactory. Sorry for this beeing a german shop, but I think you can figure out the components nevertheless

The problem is, that we have recurring Bluescreens occuring on both systems. My first idea was that incompatible RAM could be a problem since the RAM we bought is not listed in the compatibility-list of the mainboard. So I changed the RAM in both systems to this one: amazon which is supposed to be compatible with our mainboards. But this didn't solve the problem.
Using a memtest-tool started out of windows we get errors almost every few seconds. Using memtest86 from a bootable CD we get an error after a few ours of running. This occures on ALL RAM modules we have had in the systems so far.
Using Prime95 in "blend"-mode wich is supposed to test everything (also RAM) we get errors after just a few moments of running. Using the "Small FFTs"-mode which is supposed not to test RAM but only CPU doesn't produce any errors for at least half an hour (I hadn't the time to let it run longer till now).
As we used 4 different RAM's, 2 different CPUs and 2 different Mainboards, I think damaged hardware is not realy propable, right?
We run Windows 8 Pro 64 on both systems. We did a clear install on both.
I will attatch you the reports of both systems extracted via BlueScreenView.
I hope you've got any ideas

System 1:
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Dump File : 112212-19718-01.dmp
Crash Time : 22.11.2012 18:42:52
Bug Check String : IRQL_NOT_LESS_OR_EQUAL
Bug Check Code : 0x0000000a
Parameter 1 : 00000000`000055c4
Parameter 2 : 00000000`00000002
Parameter 3 : 00000000`00000000
Parameter 4 : fffff802`456034fa
Caused By Driver : atikmdag.sys
Caused By Address : atikmdag.sys+241c3
File Description :
Product Name :
Company :
File Version :
Processor : x64
Crash Address : ntoskrnl.exe+7b040
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\112212-19718-01.dmp
Processors Count : 6
Major Version : 15
Minor Version : 9200
Dump File Size : 279.912
==================================================
==================================================
Dump File : 112212-19344-01.dmp
Crash Time : 22.11.2012 18:26:21
Bug Check String : DRIVER_IRQL_NOT_LESS_OR_EQUAL
Bug Check Code : 0x000000d1
Parameter 1 : 00000000`00000034
Parameter 2 : 00000000`0000000d
Parameter 3 : 00000000`00000008
Parameter 4 : 00000000`00000034
Caused By Driver : ntoskrnl.exe
Caused By Address : ntoskrnl.exe+7b040
File Description :
Product Name :
Company :
File Version :
Processor : x64
Crash Address : ntoskrnl.exe+7b040
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\112212-19344-01.dmp
Processors Count : 6
Major Version : 15
Minor Version : 9200
Dump File Size : 279.912
==================================================
==================================================
Dump File : 112112-22292-01.dmp
Crash Time : 21.11.2012 02:19:54
Bug Check String :
Bug Check Code : 0x00000101
Parameter 1 : 00000000`00000021
Parameter 2 : 00000000`00000000
Parameter 3 : fffff880`02bc6180
Parameter 4 : 00000000`00000005
Caused By Driver : hal.dll
Caused By Address : hal.dll+4c50c
File Description :
Product Name :
Company :
File Version :
Processor : x64
Crash Address : ntoskrnl.exe+7b040
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\112112-22292-01.dmp
Processors Count : 6
Major Version : 15
Minor Version : 9200
Dump File Size : 279.912
==================================================
System 2:
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Dump File : 112112-16536-01.dmp
Crash Time : 21.11.2012 16:59:23
Bug Check String : INTERRUPT_EXCEPTION_NOT_HANDLED
Bug Check Code : 0x0000003d
Parameter 1 : fffff880`02b7acb0
Parameter 2 : 00000000`00000000
Parameter 3 : 00000000`00000000
Parameter 4 : fffff802`97c873b8
Caused By Driver : ntoskrnl.exe
Caused By Address : ntoskrnl.exe+7a740
File Description :
Product Name :
Company :
File Version :
Processor : x64
Crash Address : ntoskrnl.exe+7a740
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\112112-16536-01.dmp
Processors Count : 6
Major Version : 15
Minor Version : 9200
Dump File Size : 279.960
==================================================
==================================================
Dump File : 112112-19266-01.dmp
Crash Time : 21.11.2012 13:07:44
Bug Check String : BAD_POOL_HEADER
Bug Check Code : 0x00000019
Parameter 1 : 00000000`00000025
Parameter 2 : 00000000`00000004
Parameter 3 : 00000000`00000001
Parameter 4 : fffff8a0`1e7bda00
Caused By Driver : hal.dll
Caused By Address : hal.dll+12bb9
File Description :
Product Name :
Company :
File Version :
Processor : x64
Crash Address : ntoskrnl.exe+7a740
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\112112-19266-01.dmp
Processors Count : 6
Major Version : 15
Minor Version : 9200
Dump File Size : 279.960
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EDIT:
There was annother bluescreen on system 2:
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Dump File : 112212-12355-01.dmp
Crash Time : 22.11.2012 21:11:58
Bug Check String :
Bug Check Code : 0xa0000001
Parameter 1 : 00000000`00000005
Parameter 2 : 00000000`00000000
Parameter 3 : 00000000`00000000
Parameter 4 : 00000000`00000000
Caused By Driver : atikmdag.sys
Caused By Address : atikmdag.sys+223e2
File Description :
Product Name :
Company :
File Version :
Processor : x64
Crash Address : ntoskrnl.exe+7a740
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\112212-12355-01.dmp
Processors Count : 6
Major Version : 15
Minor Version : 9200
Dump File Size : 280.016
==================================================
EDIT2: Annother bluescreen on system 1
==================================================
Dump File : 112312-39390-01.dmp
Crash Time : 23.11.2012 13:54:17
Bug Check String : DRIVER_IRQL_NOT_LESS_OR_EQUAL
Bug Check Code : 0x000000d1
Parameter 1 : ffffffff`ffffff87
Parameter 2 : 00000000`00000002
Parameter 3 : 00000000`00000000
Parameter 4 : fffff880`0614b618
Caused By Driver : Rt630x64.sys
Caused By Address : Rt630x64.sys+5e618
File Description :
Product Name :
Company :
File Version :
Processor : x64
Crash Address : ntoskrnl.exe+7ad40
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\112312-39390-01.dmp
Processors Count : 6
Major Version : 15
Minor Version : 9200
Dump File Size : 280.056
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==================================================
Dump File : 112312-22854-01.dmp
Crash Time : 23.11.2012 17:30:56
Bug Check String : PAGE_FAULT_IN_NONPAGED_AREA
Bug Check Code : 0x00000050
Parameter 1 : fffff803`8a3737e8
Parameter 2 : 00000000`00000000
Parameter 3 : fffff803`89126cbc
Parameter 4 : 00000000`00000002
Caused By Driver : hal.dll
Caused By Address : hal.dll+b2e2
File Description :
Product Name :
Company :
File Version :
Processor : x64
Crash Address : ntoskrnl.exe+7ad40
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\112312-22854-01.dmp
Processors Count : 6
Major Version : 15
Minor Version : 9200
Dump File Size : 279.968
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Edited by TheGig, 23 November 2012 - 10:58 AM.