ATI Radeon HD 2900 XT vs NVIDIA GeForce GTX 660 Ti
We compared two Desktop platform GPUs: 512MB VRAM Radeon HD 2900 XT and 2GB VRAM GeForce GTX 660 Ti to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.
Main Differences
NVIDIA GeForce GTX 660 Ti 's Advantages
Released 5 years and 3 months late
Boost Clock980MHz
More VRAM (2GB vs 512GB)
Larger VRAM bandwidth (144.2GB/s vs 106.0GB/s)
1024 additional rendering cores
Lower TDP (150W vs 215W)
Score
Benchmark
FP32 (float)
Radeon HD 2900 XT
0.476 TFLOPS
GeForce GTX 660 Ti
+453%
2.634 TFLOPS
Graphics Card
May 2007
Release Date
Aug 2012
Radeon R600
Generation
GeForce 600
Desktop
Type
Desktop
PCIe 1.0 x16
Bus Interface
PCIe 3.0 x16
Clock Speeds
-
Base Clock
915 MHz
-
Boost Clock
980 MHz
828 MHz
Memory Clock
1502 MHz
Memory
512MB
Memory Size
2GB
GDDR3
Memory Type
GDDR5
512bit
Memory Bus
192bit
106.0GB/s
Bandwidth
144.2GB/s
Render Config
4
Compute Units
-
-
-
-
320
Shading Units
1344
16
TMUs
112
16
ROPs
24
-
-
-
-
-
-
-
L1 Cache
16 KB (per SMX)
256 KB
L2 Cache
384 KB
-
-
-
Theoretical Performance
11.89 GPixel/s
Pixel Rate
27.44 GPixel/s
11.89 GTexel/s
Texture Rate
109.8 GTexel/s
-
-
-
475.5 GFLOPS
FP32 (float)
2.634 TFLOPS
-
FP64 (double)
109.8 GFLOPS
Board Design
215W
TDP
150W
550 W
Suggested PSU
450 W
2x DVI
1x S-Video
Outputs
2x DVI
1x HDMI 1.4a
1x DisplayPort 1.2
1x 6-pin + 1x 8-pin
Power Connectors
2x 6-pin
Graphics Processor
R600
GPU Name
GK104
R600 XT
(215RGMDKA13FG)
GPU Variant
GK104-300-KD-A2
TeraScale
Architecture
Kepler
TSMC
Foundry
TSMC
80 nm
Process Size
28 nm
0.72 billion
Transistors
3.54 billion
420 mm²
Die Size
294 mm²
Graphics Features
10.0 (10_0)
DirectX
12 (11_0)
3.3 (full)
4.0 (partial)
OpenGL
4.6
N/A
OpenCL
3.0
N/A
Vulkan
1.1
-
CUDA
3.0
4.0
Shader Model
5.1
