Low graphics benchmark w/new GeForce GTX 1660 in Precision T5600


I just purchased and installed a new EVGA GeForce GTX 1660 SC Ultra Gaming video card, P/N: 06G-P4-1067-KR, in my Dell Precision T5600 workstation.  According to Passmark's GPU Benchmark website, this video card should produce a benchmark score around 11,000.  However, I'm only getting ~7,000.  I have the card installed in a PCIe 3.0 16x slot and have connected the 8-pin power cable.  I've re-installed the OS, Windows 10 Pro, twice and used the current Nvidia driver.  What am I missing?  Is there any way to troubleshoot the performance issue?

Thanks in advance,


P.S. - 

I just built this system based on this article:


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