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I get low GPU usage in unigine heaven benchmark, even on the xtreme preset. I have also noticed stuttering in games. Why is this happening when both, CPU and GPU are not being maxed out. I tried overclocking my ram to 1600 9-9-9-26 to see if it helps, but it doesn't. What is the cause of this?

Gigabyte GTX 570 super overclock - Amd a6-6400k - Antec TP550 80+ bronze - Asus A55BM-E - 2x2gb 1333 ram