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GPU Comparison
AMD Radeon HD 6990 vs NVIDIA GeForce GT 645 OEM
AMD Radeon HD 6990 vs NVIDIA GeForce GT 645 OEM
VS
AMD Radeon HD 6990
NVIDIA GeForce GT 645 OEM
We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 6990 and 1024MB VRAM GeForce GT 645 OEM to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.
Main Differences
AMD Radeon HD 6990 's Advantages
More VRAM (2GB vs 1GB)
Larger VRAM bandwidth (160.0GB/s vs 91.87GB/s)
1248 additional rendering cores
NVIDIA GeForce GT 645 OEM 's Advantages
Released 1 years and 1 months late
Lower TDP (102W vs 375W)
Score
Benchmark
FP32 (float)
Radeon HD 6990
+185%
2.55 TFLOPS
GeForce GT 645 OEM
0.894 TFLOPS
Radeon HD 6990
VS
GeForce GT 645 OEM
Graphics Card
Mar 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
-
Base Clock
-
-
Boost Clock
-
1250 MHz
Memory Clock
957 MHz
Memory
2GB
Memory Size
1024MB
GDDR5
Memory Type
GDDR5
256bit
Memory Bus
192bit
160.0GB/s
Bandwidth
91.87GB/s
Render Config
-
SM Count
6
24
Compute Units
-
1536
Shading Units
288
96
TMUs
48
32
ROPs
24
-
Tensor Cores
-
-
RT Cores
-
8 KB (per CU)
L1 Cache
64 KB (per SM)
512 KB
L2 Cache
384 KB
Theoretical Performance
26.56 GPixel/s
Pixel Rate
9.312 GPixel/s
79.68 GTexel/s
Texture Rate
37.25 GTexel/s
-
FP16 (half)
-
2.550 TFLOPS
FP32 (float)
894.0 GFLOPS
637.4 GFLOPS
FP64 (double)
74.50 GFLOPS
Graphics Processor
Antilles
GPU Name
GF114
Antilles XT (215-0807027)
GPU Variant
-
TeraScale 3
Architecture
Fermi 2.0
TSMC
Foundry
TSMC
40 nm
Process Size
40 nm
2.64 billion
Transistors
1.95 billion
389 mm²
Die Size
332 mm²
Board Design
375W
TDP
102W
750 W
Suggested PSU
300 W
1x DVI 4x mini-DisplayPort 1.2
Outputs
2x DVI 1x mini-HDMI 1.3a
2x 8-pin
Power Connectors
-
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
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