How much of an upgrade would 1x16GB RAM give over 2x4GB RAM if my PC has 4 slots and supports dual channel? Do single sticks still work well if my PCs support
![A-Tech 16GB KIT (2 x 8GB) For IBM-Lenovo Thinkpad Notebook Series E430c E431 E530c E531 E535 E545 S430 S531 T430 T430i T430s T530 T530i W520 (4 Slots. SO-DIMM DDR3 NON-ECC PC3-12800 1600MHz A-Tech 16GB KIT (2 x 8GB) For IBM-Lenovo Thinkpad Notebook Series E430c E431 E530c E531 E535 E545 S430 S531 T430 T430i T430s T530 T530i W520 (4 Slots. SO-DIMM DDR3 NON-ECC PC3-12800 1600MHz](https://m.media-amazon.com/images/I/61MDA2ZxW2L._AC_UF894,1000_QL80_.jpg)
A-Tech 16GB KIT (2 x 8GB) For IBM-Lenovo Thinkpad Notebook Series E430c E431 E530c E531 E535 E545 S430 S531 T430 T430i T430s T530 T530i W520 (4 Slots. SO-DIMM DDR3 NON-ECC PC3-12800 1600MHz
![Smartbuy 16GB (2 x 8GB) DDR4 UDIMM PC4-21300 2666MHz CL19 Unbuffered Non-ECC 1.2V 288 Pin Desktop Memory Ram - Walmart.com Smartbuy 16GB (2 x 8GB) DDR4 UDIMM PC4-21300 2666MHz CL19 Unbuffered Non-ECC 1.2V 288 Pin Desktop Memory Ram - Walmart.com](https://i5.walmartimages.com/asr/d105d401-3415-487e-9ae5-bd5d65e5bdfa.1c8833ee5443b24c9d07515bc58dc2a1.jpeg)