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GPU Comparison
AMD Radeon HD 6790 vs ATI Radeon HD 4855
AMD Radeon HD 6790 vs ATI Radeon HD 4855
VS
AMD Radeon HD 6790
ATI Radeon HD 4855
We compared two Desktop platform GPUs: 1024MB VRAM Radeon HD 6790 and 512MB VRAM Radeon HD 4855 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.
Main Differences
AMD Radeon HD 6790 's Advantages
Released 1 years and 3 months late
More VRAM (1024GB vs 512GB)
Larger VRAM bandwidth (134.4GB/s vs 115.2GB/s)
160 additional rendering cores
ATI Radeon HD 4855 's Advantages
Lower TDP (110W vs 150W)
Score
Benchmark
FP32 (float)
Radeon HD 6790
+82%
1.344 TFLOPS
Radeon HD 4855
0.736 TFLOPS
Radeon HD 6790
VS
Radeon HD 4855
Graphics Card
Apr 2011
Release Date
Jan 2010
Northern Islands
Generation
Radeon R700
Desktop
Type
Desktop
PCIe 2.0 x16
Bus Interface
PCIe 2.0 x16
Clock Speeds
-
Base Clock
-
-
Boost Clock
-
1050 MHz
Memory Clock
900 MHz
Memory
1024MB
Memory Size
512MB
GDDR5
Memory Type
GDDR5
256bit
Memory Bus
256bit
134.4GB/s
Bandwidth
115.2GB/s
Render Config
-
SM Count
-
10
Compute Units
8
800
Shading Units
640
40
TMUs
32
16
ROPs
16
-
Tensor Cores
-
-
RT Cores
-
8 KB (per CU)
L1 Cache
16 KB (per CU)
512 KB
L2 Cache
256 KB
Theoretical Performance
13.44 GPixel/s
Pixel Rate
9.200 GPixel/s
33.60 GTexel/s
Texture Rate
18.40 GTexel/s
-
FP16 (half)
-
1344 GFLOPS
FP32 (float)
736.0 GFLOPS
-
FP64 (double)
147.2 GFLOPS
Graphics Processor
Barts
GPU Name
RV770
Barts LE (215-0798002)
GPU Variant
RV770 PRO (215-0669065)
TeraScale 2
Architecture
TeraScale
TSMC
Foundry
TSMC
40 nm
Process Size
55 nm
1.7 billion
Transistors
0.956 billion
255 mm²
Die Size
256 mm²
Board Design
150W
TDP
110W
450 W
Suggested PSU
300 W
2x DVI 1x HDMI 1.3a 1x DisplayPort 1.1
Outputs
1x DVI 1x HDMI 1.3a 1x VGA
2x 6-pin
Power Connectors
1x 6-pin
Graphics Features
11.2 (11_0)
DirectX
10.1 (10_1)
4.4
OpenGL
3.3
1.2
OpenCL
1.1
N/A
Vulkan
N/A
-
CUDA
-
5.0
Shader Model
4.1
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