Graphics Card
AMD Sapphire HD 7870GHz edition DUAL-X Overclock edition
i haven't set overclocking

AMD Catalyst Driver Version, and Driver History
currently using the driver version 9.10.8.0

Operating System
Windows 7 64 bit Home Deluxe

Issue Details
I've installed 2 games so far, and currently downloading Assassin's Creed 3 and Battlefield 3, but i haven't experienced any problems playing CS:GO for hours, with several programs running etc, while when i play League of Legends, V-Sync ON or OFF, graphics very low or high, different resolutions  etc., i have experienced screen freezes, usually bicolored, or black ones, like bicolored stripes (pink/green f.i), i still get sounds from the game or Teamspeak, but i can't atl tab or ctrl alt suppr, i have to hard reboot my computer, and this can happen after 7 hours of gaming or 10 minutes. Its really random

Motherboard or System Make & Model
Asus P8B75-M LX

Power Supply
LDLC-BG-500 ATX12V-500W FAN 12CM

Display Device(s) and Connection(s) Used
SAMSUNG 24IN LED S24B350H FHD VGA/HDMI 2MS
The screen cable is a VGA so i'm using a VGA-DVI adapter

Applications and Games
happens with only League of Legends, even though nothing is running beside
Latest version, had this trouble with the 2 latest patches (since i'm using my new computer, 2-3 weeks)

CPU Details
- include model, speed, number of cores (ex: AMD Phenom II x4 965 Black Ed.)
- if any over-clocking is being done provide details about it (ex: multiplier, voltages, clock speeds, and the application used to over-clock)

Motherboard BIOS Version
0606

System Memory Type & Amount
SEAGATE BARRACUDA 2TB SATA 3.5IN 7200RPM 64MB 6GB/S

2xCORSAIR DDR3 4GB CMV4GX3M1A1600C11

Additional Hardware
installed COOLER MASTER HYPER TX3 EVO - RR-TX3E-22PK-R1 on my core

Additional Details
used memtest86; one of the 2 RAM's was defectuous, i had it returned and installed the new one.

in the bios, only information in red is : Chafan 1 544RPM

i've tested my system temp while i'm playing and before the freezes, i'm around 40° everywhere.

Thanks in advance, this is getting really annoying as i'm a semi-pro LoL player and i get randoms 3min dcs pretty often (every 2-3 games, can be twice a game)

Have you checked the new one as well? Just to make sure it's not the mobo or the dimm itself.

CPU: AMD Phenom II X4 810 @ 3250MHz | RAM: Kingmax 2x2GB DDR2 800 @ 833MHz| MoBo: MSI K9A2 CF v1.0 (BIOS: 1.D)| GPU: Asus HD 6850 1024MB (DirectCu) @ 850/1100MHz | Display: Chili Green Vision L24FHD | PSU: PC Power & Cooling Silencer 750 Quad | OS: MS Windows 95 x64 Edition

CPU: Pentium 4 Northwood S478 @ 3200MHz | RAM: 1,5GB DDR 400| MoBo: Gigabyte GA-8S661FXMP-RZ | GPU: Abit Geforce Ti 4200 | Display: Dimarson 19" CRT | PSU: Noname 400W | OS: MS Windows XP Pro, Fedora 18

Yep, it didn't find any problems after i put the new one in.

Just downloaded the latest beta drivers, i still had the problem the 1st second of a game and 40s after i got in the game after the reboot.

Edit : i just downloaded Diablo 3, pc froze after 30min, temp still around 40-50°... Guess i have to take it back ?

This is an issue that Riot has known about for over 2 months now and has done nothing to fix. It started with complaints from NVidia users, and then the complaints from ATI users started pouring in. I use an AMD HD 7850, and I have the same problem at random. Game will freeze, go black screen, and after 10 - 15 seconds it will come back.

Here is the thread on the Riot forums.

http://na.leagueoflegends.com/board/showthread.php?t=3073407

Any help from ATI would be greatly appreciated.

Yeah, this might be it, the thing is i had this problem after playing diablo for 15min, and its not necessarily a black screen, most of the times it's a colored striped screen, even tho i still can talk through teamspeak or skype. Do you think it might also be a hardware issue on top of the current problem with the LoL game ?