and regarding MEMtest, On my motherboard theres two Black Slots and two Blue ones. now its only the blue ones that work, is there an explanition for that? just cause you say if i find a good one test it in all slots 
My Computer
- Computer Manufacturer/Model Number
- Home made
- OS
- Windows 7 Ultimate x64
- CPU
- Core i5 750
- Motherboard
- Intel DH577DD
- Memory
- 8 GB Kingston Hyper x Blu
- Graphics Card(s)
- AsuS GeForce 560ti OC'ed to 900MHZ
- Sound Card
- HD Built in
- Monitor(s) Displays
- 23,6" AOC
- Screen Resolution
- 1080p BABY
- Hard Drives
- 500GB Western Digital
- PSU
- Corsair GTX 750W
- Case
- NZXT LexaS
- Cooling
- 5 Case Fans + Standard CPU cooler
- Keyboard
- Razer Arctosa
- Mouse
- Logitech MX518
- Internet Speed
- dunno...