Computer lags every few mins during games?

There is likely a problem with the power supply. After installing the GTX 550 Ti it started to get considerably worse. The power consumption of the GTX 550 Ti is higher than the one of the HD 2400.

I've never heard of a company named Powerstar. Normally a 650W psu is more than enough but this psu could be utter garbage not even able to power this computer. Edit the specs of this computer are good enough to run BF3 and Crysis 2 on medium-high.

The cpu temp. Of 45C is very low, so it must be something else.

The easiest way to test RAM is memtest86+. Also make sure there aren't any overclocks active on the system. Double check to make sure the RAM timing is set correctly.

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