Radeon HD 6790 vs GeForce GT 645 OEM
We compared two Desktop platform GPUs: 1024MB VRAM Radeon HD 6790 and 1024MB VRAM GeForce GT 645 OEM to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.
Main Differences
Radeon HD 6790 Advantages
Larger VRAM bandwidth (134.4GB/s vs 91.87GB/s)
512 additional rendering cores
GeForce GT 645 OEM Advantages
Released 1 years late
Lower TDP (102W vs 150W)
Score
Benchmark
FP32 (float)
Radeon HD 6790
+50%
1344
GeForce GT 645 OEM
894
Graphics Card
Apr 2011
Release Date
Apr 2012
Northern Islands
Generation
GeForce 600
Desktop
Type
Desktop
PCIe 2.0 x16
Bus Interface
PCIe 2.0 x16
Clock Speeds
1050 MHz
Memory Clock
957 MHz
Memory
1024MB
Memory Size
1024MB
GDDR5
Memory Type
GDDR5
256bit
Memory Bus
192bit
134.4GB/s
Bandwidth
91.87GB/s
Render Config
10
Compute Units
-
-
SM Count
6
800
Shading Units
288
40
TMUs
48
16
ROPs
24
8 KB (per CU)
L1 Cache
64 KB (per SM)
512 KB
L2 Cache
384 KB
Theoretical Performance
13.44 GPixel/s
Pixel Rate
9.312 GPixel/s
33.60 GTexel/s
Texture Rate
37.25 GTexel/s
1344 GFLOPS
FP32 (float)
894.0 GFLOPS
-
FP64 (double)
74.50 GFLOPS
Board Design
150W
TDP
102W
450 W
Suggested PSU
300 W
2x DVI
1x HDMI 1.3a
1x DisplayPort 1.1
1x HDMI 1.3a
1x DisplayPort 1.1
Outputs
2x DVI
1x mini-HDMI 1.3a
1x mini-HDMI 1.3a
2x 6-pin
Power Connectors
-
Graphics Processor
Barts
GPU Name
GF114
Barts LE
(215-0798002)
(215-0798002)
GPU Variant
-
TeraScale 2
Architecture
Fermi 2.0
TSMC
Foundry
TSMC
40 nm
Process Size
40 nm
1.7 billion
Transistors
1.95 billion
255 mm²
Die Size
332 mm²
Graphics Features
11.2 (11_0)
DirectX
12 (11_0)
4.4
OpenGL
4.6
1.2
OpenCL
1.1
N/A
Vulkan
N/A
-
CUDA
2.1
5.0
Shader Model
5.1