Radeon HD 4870 X2

TeraScale Radeon HD 4000 Series Gaming Desktop GDDR5 2008

Key Metrics

Architecture: TeraScale
Launch Date: 2008-08-12
Stream Processors: 800
Memory: 1 GB GDDR5
Memory Bandwidth: 115.2 GB/s
TDP/TBP: 286 W
Interface: PCIe 2.0 x16

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GPU Specs

What do these fields mean?

Identity
Entry Type	Reference GPU
Official Name	ATI Radeon HD 4870 X2
Architecture	TeraScale
Launch Date	2008-08-12
Core Specs
GPU Die	R700
Process Node	TSMC 55 nm
Transistor Count	0.96 billion
Die Size	256 mm²
Stream Processors	800
TMUs	40
ROPs	16
Base Clock	750 MHz
Boost Clock	750 MHz
Pixel Fillrate	12 GP/s
Texture Fillrate	30 GT/s
FP32 Throughput	1.2 TFLOPS
FP64 Throughput	0.24 TFLOPS
Memory
Memory Size	1 GB
Memory Type	GDDR5
Memory Bus Width	256-bit
Memory Clock	900 MHz
Memory Bandwidth	115.2 GB/s
L2 Cache	0.25 MB
L1 Cache	16 KB
Board and Display
TDP / TBP	286 W
Recommended PSU	600 W
Interface	PCIe 2.0 x16
Display Outputs	2x DVI, 1x S-Video
Slot Width	Dual-slot
Card Length	267 mm
Software
Shader Model	4.1
DirectX Support	DirectX 10.1
OpenGL Support	OpenGL 3.3
OpenCL Support	OpenCL 1.1

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

Sources

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

TechPowerUp GPU SpecsOpen source

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