High-Bandwidth Flash (HBF)

Next-generation memory combining HBM-like data-processing speed with NAND flash capacity; SanDisk has taped out its first HBF die.

Known aliases

HBF
high bandwidth flash
high-bandwidth flash

Current stories

investConfirmed2 publishers

SK hynix locates the next AI inference bottleneck in the data moving between HBM, DRAM and SSDs

SK hynix's Ahn Hyun projects AI infrastructure performance needs will grow roughly 19 to 20 times by 2030, citing inference demand. The company's answer is to tune the whole memory hierarchy, from HBM down to SSDs, and to add 3D stacked DRAM and a NAND-based HBF.

Publishers:en.yna.co.kr koreaherald.com koreajoongangdaily.com

Perspective Coverage

3 publishers

Builder: Builder 38%
Operator: Operator 34%
Investor: Investor 28%

Reality

Evidence30
Adoption: Insufficient
Hype gap+20
Incentives65
Confidence70

investOne report1 publisher

SK hynix puts 99.5% of its 1,105 trillion won fab program inside South Korea

Kwak Noh-jung told a Santa Clara forum that new production bases will defend SK hynix's memory lead. The four named sites add to 1,105.4 trillion won. Indiana's fab is 5.4 trillion of that, and Japan is still under consideration.

Publishers:en.sedaily.com

Reality

Evidence40
Adoption: Insufficient
Hype gap+35
Incentives80
Confidence45

buildOne report1 publisher

The cheap-memory pitch for High Bandwidth Flash needs a grade that has no ship date

OXMIQ's Hot Chips model gives a flash-backed rack 14 times the capacity and 58 percent of the bandwidth. Two of the three HBF grades cannot keep pace with today's HBM.

Publishers:tomshardware.com

Reality

Evidence40
Adoption8
Hype gap+45
Incentives62
Confidence42

buildOne report1 publisher

SK hynix rules hybrid bonding out of HBM4E, leaving 55 microns to do the work

Copper-to-copper slips to HBM5 at the earliest, so HBM4E capacity has to come out of die thickness inside a 775-micron package. iHBM heat blocks cannot be retrofitted to parts already in design.

Publishers:tomshardware.com

Reality

Evidence61
Adoption44
Hype gap+9
Incentives73
Confidence56

investOne report1 publisher

SanDisk guides three years of near-peak margins and prices NAND as an AI input, not a commodity

The company promises about 80 percent gross and 75 percent operating margins through fiscal 2030 plus all excess cash back. Contracted volume, not scarcity talk, is the mechanism.

Publishers:en.sedaily.com

Reality

Evidence32
Adoption42
Hype gap+30
Incentives74
Confidence38