WD/ZDNET The WD Black SN850X is an M.2 SSD rated for use in laptops and desktops, and if you've got a PC that you've been avoiding upgrading due to high SSD costs, now is the perfect time to buy. Right now at Best Buy, you cansave 53% on the 4TB model, bringing the price to $800. That's a discount of over $900, bringing the cost closer to pre-AI pricing. Also: The best M.2 SSDs you can buy Don't need that much storage space, or do you need more? The SN850X is also available in 1TB, 2TB, and 8TB capacities, each with its own steep discount, so you can choose the version that best suits your needs now and gives you room to grow. Each version features read and write speeds of 7300 and 6600 MB/s, respectively, giving you much faster loading times in games, quicker app launches, and easier access to your most-used files.  Also: SSD vs. HDD The WD Black SN850X is tailor-made for premium gaming, featuring predictive loading to keep the most-used assets ready for faster load times.…