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From the reviews on best buy the box image from customers shows its a gen 4, but you’re right best buy needs to correct their specs information for this product.
Sorry, there was a problem. Please try again later.It is 4x4 but you must have a 4x4 compatible motherboard and cpu to making it work. If either does not support the 4x4 format it will run at 3x4
Sorry, there was a problem. Please try again later.The WD SN750 is a Gen 3 and the WD SN850 is the faster Gen 4. This drive is a WD SN850, stated under the specs, so it’s the Gen 4 - PCI Express 4.0 x4. The SN750 has a max read speed of 3500 MBps and the SN850 (this drive) has a max read speed of 7000 MPbs. You probably already know this but other who read this, the motherboard and processor must support the Gen 4 x4 and if not then it will work but just at the slower speed.
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