How can reduce the CPU load for this video card?

I have tested two video cards one by one in my Linux box in the first PCI-e x16 slot (next to the CPU). Old card: Asus Radeon EAH5570/DI/1GD3(LP) glmark2 score 1873 PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 2958 laci 20 0 588208 46288 29492 S 48.8 0.3 0:20.36 glmark2 Newer card: NVIDIA GeForce GT 710/PCIe/SSE2 glmark2 score 1888 PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 5863 laci 20 0 140784 61280 31448 R 100.0 0.4 1:33.96 glmark2 1248 root -51 0 0 0 0 S 45.8 0.0 7:33.00 irq/25+ GT710 has 3 times larger CPU load than EAH5570 beside about the same score of glmark2 benchmark. I would prefer to use the GT710 because it has a passive cooling and older has fairly loud fan. But I would like to know is there a better setting for GT710 card to smaller CPU load keeping about the same glmark2 benchmark score (1888) ? The environment is: Ubuntu 18.04 Mather board is GA-870A GIGABYTE with AMD FX(tm)-6300 (6 core) 3.5GHz with DDR3 RAM 16GByte. Apart from one video card, the PCI-e,PCI slots are empty.