Need help in Memory Stress Test

My cpu is Core i3 2120@3.3ghz(2cores/4threads) and 2×2gb 1333mhz g.skills ram and win7 64bit ultimate.
The problem is when i do Memory Stress Test in Intel Extreme Tuning Utility max.ram used doesnot increase than 2400mb even though there is 1200mb ram totally free.But my cpu usage becomes 100%
So is this some kind of bottleck due to Cpu or some other component??
PSU is CM 600W Bronze
HDD WD Caviar black 1Tb
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  1. Best answer
    That may be due to that Intel extreme tuning utility isnt able to use 4gb ram
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