There are three major DRAM chip manufacturers: Micron, in the US, and Samsung and SK Hynix, both in South Korea.

Micron has two new fabs coming online in Boise, Idaho. The earliest one is scheduled to start operation in the first half of 2027 (they recently announced that they'd moved that timeline up from the second half of 2027) though it'll take time to ramp up; it will not be doing output at full capacity immediately when it first starts up.

https://www.micron.com/us-expansion/id

They announced late last year that they were going to do a second Boise one as well for more capacity.

They also have New York fabs that they're doing:

https://www.micron.com/us-expansion/ny

For the South Korean manufacturers:

https://koreajoongangdaily.joins.com/news/2026-03-12/business/industry/Samsung-and-SK-are-expanding-fast-but-why-is-memory-still-in-short-supply/2540153

Samsung

This year, Samsung is prioritizing the conversion of its lines to memory chips at its Pyeongtaek campus in Gyeonggi and the acceleration of new facility construction at the site.

At the P4 plant, the company is upgrading dynamic random-access memory (DRAM) production to its latest 1c process, which will be used for high bandwidth memory (HBM) and advanced DRAM chips. Samsung aims to secure 1c capacity of more than 200,000 wafers per month by the end of the year through line conversion and additional equipment installation.

Construction of P5, which had previously been delayed during the semiconductor downturn, resumed this year with a timeline accelerated by roughly six months compared to earlier plans. The chipmaker is bringing in tens of thousands of new workers to construct the megafab, capable of producing HBM, DRAM, NAND flash and potentially foundry chips. Construction is expected to be completed in the first half of 2027, with equipment installation beginning shortly afterward and mass production targeted for the latter part of 2028.

Construction of the last Pyeongtaek facility, P6, is currently expected to start in the third quarter of 2028.

SK Hynix

SK hynix is currently concentrating short-term investment on expanding capacity at its M15X fab in Cheongju, North Chungcheong, while also upgrading older lines.

The company is adding 1b DRAM capacity at M15X, while accelerating 1c node conversions at its M14 and M16 fabs for production of HBM and server DRAM. After hitting a capacity of 10,000 wafers per month last year, it is expected to expand capacity by up to 70,000 wafers per month this year.

For a new greenfield project, SK hynix is advancing construction at the Yongin semiconductor cluster in Gyeonggi, one of the largest semiconductor manufacturing projects globally. The cluster will ultimately host six Samsung fabs from Samsung and four SK hynix facilities, and the latter is moving ahead first.

Construction of the first fab, Y1, is expected to be completed in February of next year, earlier than previously planned. Equipment installation is scheduled to begin in the second quarter of 2027.

Y1 will be built in six cleanroom "phases," a unit used in fab construction for the capacity expansion stage. Each phase adds more floor space and related equipment for wafer capacity expansion. The first three phases are expected to begin operation within the same year, providing a capacity of 150,000 wafers per month, with the remaining phases adding another 150,000 wafers per month once fully operational.

The second fab in the cluster, Y2, is expected to begin construction around the third quarter of 2028.