SK hynix, the world's biggest supplier of high-bandwidth memory (HBM), this week approved a ₩19 trillion ($12.896 billion) investment to build P&T7, a new advanced packaging and test facility in South Korea, dedicated solely to HBM. The plant will likely be the biggest HBM assembly and test facility in the world, but it will almost certainly not be the last HBM packaging and test facility of the same scale and cost going forward, considering the booming demand for memory, which has caused DRAM pricing to skyrocket.
Being the world's largest supplier of any type of product means you need to stay ahead of the whole industry, in terms of technology and production capacity, and the devil is in the details.
A massive facility
The company plans to construct what it calls P&T7 (Packaging & Testing 7) facility at the Cheongju Technopolis Industrial Complex, on a site measuring approximately 70,000 pyeong (approx. 231,405 square meters or 2,490,822 square feet). Construction is scheduled to begin in April 2026, and completion is targeted for the end of 2027, which is when the building will be finished, and is when SK hynix will begin installing equipment. Due to the equipping phase, expect the plant to come online toward the end of the decade on time for HBM4E, HBM5, and HBM5E types of memory.
The facility's dimensions are massive, resulting in a campus-scale site, rather than a back-end factory plot. For packaging and testing, the Fab P&T7 plot is unusually large; this may reflect the importance of HBM (and other exotic types of memory) assembly for the AI industry specifically, and the memory industry as a whole.
To put the scale into context, Intel's Ocotillo Campus near Chandler, Arizona, spans over 362,727 square meters, but it houses multiple front-end fab buildings, such as Fab 12, Fab 22, Fab 32, Fab 52, and Fab 62. Both Fab 52 and Fab 62 are expected to be capable of processing up to 40,000 wafer starts per month each when fully ramped, which makes them bigger than typical logic fabs run by TSMC.
(Image credit: SK hynix)
While HBM packaging is a back-end activity, it still requires complex techniques like etching, lithography, hybrid bonding, and many other steps and tools used in logic production. This explains why HBM testing and packaging facilities are larger than typical back-end facilities.
Nonetheless, HBM packaging is inherently simpler than producing logic, so the scale of SK hynix's P&T7 plant is enormous, even by HBM standards. Its dimensions and investments dwarf SK hynix's HBM testing and assembly plant in West Lafayette, Indiana, which will cost the memory maker $4 billion and will span 39,948 square meters. Yet, keeping in mind that SK hynix expects the compound annual growth rate (CAGR) of HBM to be 33% from 2025 to 2030, it needs all the front-end DRAM and back-end packaging facilities it can build.
A strategic location
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