Mobility Radeon HD 4870

Laptop GPU

TeraScale Radeon HD 4000 Series Mobile Laptop GDDR3 2009

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At a Glance

Entry Type: Laptop GPU
Architecture: TeraScale
Series: Radeon HD 4000 Series
GPU Die: M98
Launch Date: 2009-01-09
Stream Processors: 800
TMUs: 40
ROPs: 16
Memory: 512 MB GDDR3
Bus Width: 256-bit
Interface: PCIe 2.0 x16
Data Confidence: Partial

GPU Specs

What do these fields mean?Partial

Identity
Entry Type	Laptop GPU
Official Name	ATI Mobility Radeon HD 4870
Architecture	TeraScale
Launch Date	2009-01-09
Core Specs
GPU Die	M98
Chip Variant / Package	HFCBGA-1492
Process Node	TSMC 55 nm
Transistor Count	0.96 billion
Die Size	256 mm²
Stream Processors	800
TMUs	40
ROPs	16
Base Clock	550 MHz
Boost Clock	550 MHz
Pixel Fillrate	8.8 GP/s
Texture Fillrate	22 GT/s
FP32 Throughput	0.88 TFLOPS
FP64 Throughput	0.18 TFLOPS
Memory
Memory Size	512 MB
Memory Type	GDDR3
Memory Bus Width	256-bit
Memory Clock	888 MHz
Memory Bandwidth	56.83 GB/s
L2 Cache	0.25 MB
L1 Cache	16 KB
Board and Display
Interface	PCIe 2.0 x16
Slot Width	MXM Module
Software
Shader Model	4.1
DirectX Support	DirectX 10.1
OpenGL Support	OpenGL 3.3
OpenCL Support	OpenCL 1.1

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Why It Mattered

This entry is currently a specification record. Historical notes will be added after source review.

Known Issues

Known issues pending source review.

SourcesPartial

Sources reviewed: 2026-06-23

This entry is still being source-checked.

Data confidence and source status

Partial entry. Core specifications may be present, but history, variant notes, known issues, and source review may be incomplete.

Verified: core specifications and historical notes have been reviewed against listed sources.
Partial: core specifications may be present, but history, variant notes, known issues, and source review may be incomplete.
Imported: spec-only imported entry pending editorial source review.
Needs source review: narrative notes are incomplete until reviewed.

Independent reference sources

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