Sapphire HD 4870 X2

100251SR

Graphics Processor

R700 x2

Cores

800 x2

TMUs

40 x2

ROPs

16 x2

Memory Size

1024 MB x2

Memory Type

GDDR5

Bus Width

256 bit x2

GPU

Front 2

I/O

Top

Bottom

Back

Graphics Processor

GPU Name: R700

GPU Variant: R700 XT
(215-0669045)

Architecture: TeraScale

Foundry: TSMC

Process Size: 55 nm

Transistors: 956 million

Density: 3.7M / mm²

Die Size: 256 mm²

Graphics Card

Release Date: Aug 12th, 2008

Generation: Radeon R700
(HD 4800)

Predecessor: Radeon R600

Successor: Evergreen

Production: End-of-life

Bus Interface: PCIe 2.0 x16

Clock Speeds

GPU Clock: 750 MHz

Memory Clock: 900 MHz
3.6 Gbps effective

Memory

Memory Size: 1024 MB

Memory Type: GDDR5

Memory Bus: 256 bit

Bandwidth: 115.2 GB/s

Render Config

Shading Units: 800

TMUs: 40

ROPs: 16

Compute Units: 10

L1 Cache: 16 KB (per CU)

L2 Cache: 256 KB

Theoretical Performance

Pixel Rate: 12.00 GPixel/s

Texture Rate: 30.00 GTexel/s

FP32 (float): 1,200 GFLOPS

FP64 (double): 240.0 GFLOPS (1:5)

Board Design

Slot Width: Dual-slot

Length: 267 mm
10.5 inches

Width: 111 mm
4.4 inches

Height: 38 mm
1.5 inches

TDP: 286 W

Suggested PSU: 600 W

Outputs: 2x DVI
1x S-Video

Power Connectors: 1x 6-pin + 1x 8-pin

Board Number: 109-B50937-00

Graphics Features

DirectX: 10.1 (10_1)

OpenGL: 3.3

OpenCL: 1.1

Vulkan: N/A

Shader Model: 4.1

Card Notes

This is a dual GPU card that features two RV770XT chips and a PCI-E lane arbiter chip made by PLX. The card features a total of 2 GB GDDR5 memory.

R700 GPU Notes

Codename: Wekiva
Graphics/Compute: GFX3
Display Core Engine: 3.1
Unified Video Decoder: 2.0

Other retail boards based on this design (7)

Name	GPU Clock	Memory Clock	Other Changes
ASUS HD 4870 X2 TOP	790 MHz	915 MHz
Gainward Rampage700 GS	750 MHz	950 MHz	Triple-slot, 1x DVI 1x HDMI 1x DisplayPort 1x VGA
Gainward Rampage700 GS GLH	790 MHz	950 MHz	Triple-slot, 1x DVI 1x HDMI 1x DisplayPort 1x VGA
HIS HD 4870 X2	750 MHz	900 MHz
PowerColor HD 4870 X2	750 MHz	900 MHz
Sapphire HD 4870 X2	750 MHz	900 MHz
Sapphire HD 4870 X2 ATOMIC	800 MHz	1000 MHz	Single-slot