Computer runs pretty slow afer installing new ram

Today I bought two identical rams 4x2, I had 4 GB before and I wanted to upgrade to 8 GB because new games demands high ram, my computer used to run pretty well but when I installed the new rams today, when I get to windows it runs super slow, there's something wrong but I don't know what's the problem, when I run a game it gets even slower, I can't watch movies, I can't play games, I can barely surf the internet but it's slow, I tried to put back the old rams and now the computer runs slow as well on them, plz help me I feel like I dropped a lot of money over nothing, here are my computer specs:
core 2 quad q9550 2.83GHz 64bit
Windows 7 ultimate 64 bit
GA-G41M-Combo motherboard
nvidia geforce gts 450
G.SKILL Sniper 8GB (2 x 4GB) ddr3 1333 (PC3 10666)
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More about computer runs pretty slow afer installing ram
  1. Best answer
    Grab a spare USB flash drive and install memtest onto that drive, use said drive to test your RAM.
  2. Your motherboard probably defaulted the RAM to its lowest setting. Go to your BIOS and set it to 1333 MHz.
  3. This is hard to troubleshoot from a distance, but I can tell you some things to hopefully get you started.

    It sounds to me like your problem may be heat, and since it started when you were working in the case, I wonder if a fan is blocked or unplugged.

    First, turn off and unplug your system. Open the case and lightly touch the CPU cooler. If it's more than a little warm, check and make sure you didn't either accidentally unplug the CPU cooler fan from the motherboard, and also make sure the fan turns freely and nothing is caught in it.

    Reseat every plug and connector that you can get to--again, make sure your computer is off and your power cord is completely unplugged before you do this.

    Look at all the fans and make sure their power cords didn't come unplugged and that they can turn.

    Good luck!
  4. I did that before I installed the new rams, I overclocked it to 1333 and there was no problem until I installed them
  5. I can tell you one thing, the system fan isn't working because I have a huge CPU fan that is blocking it, and my CPU temperature right now is 65 and sometimes it gets higher
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