Radeon HD 7850 and Radeon HD 3870 X2 - video card comparison
Passmark - benchmark score Radeon HD 7850 vs Radeon HD 3870 X2
Radeon HD 7850
3976
Radeon HD 3870 X2
729
Radeon HD 7850
Radeon HD 3870 X2
Architecture
GCN 1.0 (2012−2020)
TeraScale (2005−2013)
GPU code name
Pitcairn
R680
Market segment
Desktop
Desktop
Release date
March 2012
January 2008
Bus support
PCIe 2.1 x16
-
Interface
PCIe 3.0 x16
PCIe 2.0 x16
Supplementary power connectors
1x 6-pin
1x 6-pin + 1x 8-pin
Boost clock speed
1000 MHz
-
Core clock speed
-
825 MHz
Floating-point performance
1,761 gflops
2x 528.0 gflops
Manufacturing process technology
28 nm
55 nm
Number of transistors
2,800 million
666 million
Pipelines / CUDA cores
1024
320
Power consumption (TDP)
130 Watt
165 Watt
Texture fill rate
55.04
13.20
Memory type
GDDR5
GDDR3
Maximum RAM amount
2 GB
512 MB
Memory bus width
256 Bit
256 Bit
Memory clock speed
1200 MHz
1802 MHz
Memory bandwidth
153.6 GB/s
57.66 GB/s
Display Connectors
1x DVI, 1x HDMI, 2x mini-DisplayPort
2x DVI, 1x S-Video
Eyefinity
1
-
HDMI
+
-
DisplayPort support
-
-
DirectX
12
10.1 (10_1)
Mantle
-
-
OpenCL
1.2
N/A
OpenGL
4.6
3.3
Shader Model
5.1
4.1
Vulkan
+
N/A
AppAcceleration
-
-
CrossFire
1
-
Enduro
-
-
FreeSync
1
-
HD3D
-
-
PowerTune
-
-
TrueAudio
-
-
ZeroCore
-
-