Not getting advertised speed on my extreme pro 2TB SSD

I tested my new extreme pro SSD with the original Type-C to A cable numerous times and had very disappointing results topping only around 460mb/s (connect to USB 3.1 gen2 port).
I wonder if the Type-C to C connection is required to get up to 1050mb/s?
or am I having a defective drive??
Any helps appreciated, thanks.