📚 Stock Market Glossary
Clear, beginner-friendly explanations, real-world analogies, and visual formulas for key stock market terminology.
HBM4 (6th Generation High Bandwidth Memory)
Corporate & Tech💡 Key Takeaway: The 6th generation custom High Bandwidth Memory featuring a 2048-bit bus width and foundry logic base dies for unprecedented bandwidth and power efficiency.
16-Story Mega Mall Analogy: Upgrading a 12-story department store by rebuilding the ground floor lobby with ultra-modern smart logic and doubling the number of express elevators for traffic!
😎 10-Second Show-off Pro Tip for Friends!
😎 Show-off Tip: Tell your friends, 'HBM4 changes the entire game because the base die moves to advanced foundry nodes with a 2048-bit bus width. It transforms memory into a custom co-designed silicon product!'
📖 Beginner-Friendly Explanation
STEP 1
Core Concept & Meaning
HBM4 represents the 6th generation of High Bandwidth Memory, stacking up to 16 DRAM layers vertically to fuel ultra-large AI models.
Unlike previous generations, HBM4 adopts advanced foundry logic processes (4nm/3nm) for the base die, enabling direct custom integration with host GPUs.
STEP 2
Why It Matters & Mechanism
- Doubled Bus Width (2048-bit): Broadens the data bus from 1024 to 2048 I/O channels for over 2TB/s memory bandwidth per stack.
- Custom Logic Base Die: Allows customized compute logic and power optimization directly inside the memory base die.
- 16-High Stacking (Up to 48GB-64GB): Achieves immense memory density per stack via Advanced MR-MUF and Hybrid Bonding.
STEP 3
Practical Investment Tips & Pitfalls
HBM4 solidifies custom memory partnerships between SK Hynix, Samsung, and TSMC. Watch advanced packaging equipment makers (Hybrid Bonding, CMP polishing, probe cards) closely.
📊 HBM Bandwidth Calculation Formula (HBM3E vs HBM4)
Memory bandwidth (GB/s) = (Number of I/O pins × Transfer rate per pin Gbps) ÷ 8
▶ HBM3E (1024 bits, 9.6 Gbps): Approximately 1,228 GB/s (1.2 TB/s)
▶ HBM4 (2048 bits, 10+ Gbps): 2,000+ GB/s per stack (exceeded 2.0+ TB/s)
⚖️ Key Comparison at a Glance
| Category | 5th generation (HBM3E) | 6th generation (HBM4) |
|---|---|---|
| I/O bus width | 1,024 bits | 2,048 bits (2x expansion) |
| Base die process | Memory manufacturer's own legacy process | TSMC / Samsung advanced foundry logic process (4nm/3nm) |
| Maximum number of layers | 8 – 12 Layer (24GB – 36GB) | 12-speed – 16-speed (36GB – 48GB+) |
| Bandwidth per stack | Approximately 1.2 TB/s | 2.0 TB/s – 2.5 TB/s+ |
📌 Practical Market & Real-World Example
SK Hynix partnered with TSMC to develop and mass-produce HBM4 on advanced foundry logic nodes for NVIDIA's next-generation Rubin AI computing platform.