# HBM1

> type of 3D-stacked synchronous dynamic random-access memory

**Wikidata**: [Q131460387](https://www.wikidata.org/wiki/Q131460387)  
**Source**: https://4ort.xyz/entity/hbm1

## Summary  
HBM1 (High Bandwidth Memory 1) is a type of 3D-stacked synchronous dynamic random-access memory designed for high-performance computing applications. It was developed as part of the High Bandwidth Memory (HBM) standard, primarily through collaboration between AMD and Hynix. HBM1 offers significantly improved memory bandwidth compared to traditional GDDR5 and DDR4 solutions.

## Key Facts  
- HBM1 operates at a frequency of 500 MHz.  
- It supports a data transfer speed of up to 1024 gigabits per second.  
- It is classified as a subclass of High Bandwidth Memory (HBM).  
- HBM1 is used in graphics cards and high-performance computing hardware.  
- On PCPartPicker, it is categorized under video card memory types with ID "video-card/#T=11".  
- Aliases include HBM, HBM 1, and High Bandwidth Memory 1.  
- Followed by version Q131460388 in the development sequence.  

## FAQs  
### Q: What is HBM1 used for?  
A: HBM1 is used in high-performance computing systems and graphics cards to deliver extremely high memory bandwidth. It enables faster data access than conventional memory technologies like GDDR5 or DDR4.

### Q: Who developed HBM1?  
A: HBM1 was jointly developed by AMD and Hynix as part of the broader High Bandwidth Memory initiative aimed at improving memory performance in 3D-stacked architectures.

### Q: How fast is HBM1 memory?  
A: HBM1 has a maximum data transfer speed of 1024 gigabits per second and operates at a frequency of 500 MHz.

## Why It Matters  
HBM1 marked a significant advancement in memory architecture by introducing 3D stacking technology, dramatically increasing bandwidth while reducing power consumption. This innovation addressed growing demands in GPU and compute workloads where traditional planar memory designs were reaching physical limitations. By vertically stacking DRAM dies and connecting them via through-silicon vias (TSVs), HBM1 enabled more efficient use of space and better thermal management. Its adoption helped accelerate developments in AI training, scientific simulations, and advanced rendering tasks that require rapid access to large datasets.

## Notable For  
- First generation of the High Bandwidth Memory (HBM) specification.  
- Pioneered 3D-stacked DRAM design for consumer and enterprise GPUs.  
- Delivered over twice the bandwidth of contemporary GDDR5 modules.  
- Enabled compact form factor with lower power usage compared to planar memory configurations.  

## Body  

### Overview  
HBM1 (High Bandwidth Memory 1) represents the initial iteration of a new class of high-bandwidth memory interfaces tailored for modern computing needs. Unlike traditional memory standards such as DDR4 or GDDR5, HBM1 uses vertical stacking of DRAM chips interconnected using Through-Silicon Vias (TSVs).

### Technical Specifications  
- **Frequency**: Operates at 500 MHz.  
- **Data Transfer Speed**: Up to 1024 gigabits per second.  
- **Architecture**: Utilizes 3D-stacked DRAM dies connected via TSVs.  
- **Interface Class**: Subclass of High Bandwidth Memory (HBM).  

### Development and Adoption  
Developed collaboratively by AMD and Hynix, HBM1 was introduced as a solution to overcome bandwidth bottlenecks faced by earlier memory technologies. It found early adoption in high-end GPUs and compute accelerators requiring dense, fast memory subsystems.

### Classification and Identification  
- **Aliases**: HBM, HBM 1, High Bandwidth Memory 1.  
- **PCPartPicker Identifier**: video-card/#T=11 (qualifiers indicate “Memory Type” and value “HBM”).  
- **Successor**: Followed by Q131460388 in the evolutionary chain of HBM generations.  

### Performance Advantages  
Compared to GDDR5, HBM1 offered higher bandwidth efficiency within a smaller footprint. The stacked configuration allowed for wider memory buses without increasing PCB complexity, making it ideal for space-constrained environments like mobile workstations and server GPUs.