GeForce 8800 Ultra and GeForce 8800 GTS 640 - video card comparison
GeForce 8800 Ultra
GeForce 8800 GTS 640
Architecture
Tesla (2006−2010)
Tesla (2006−2010)
GPU code name
G80
G80
Market segment
Desktop
Desktop
Release date
May 2007
November 2006
Interface
PCIe 1.0 x16
PCIe 1.0 x16
Supplementary power connectors
2x 6-pin
1x 6-pin
SLI options
+
-
Core clock speed
612 MHz
513 MHz
CUDA cores
612
-
Floating-point performance
387.1 gflops
228.1 gflops
Manufacturing process technology
90 nm
90 nm
Number of transistors
681 million
681 million
Pipelines / CUDA cores
128
96
Power consumption (TDP)
171 Watt
143 Watt
Texture fill rate
39.2 billion/sec
24.62
Memory type
GDDR3
GDDR3
Maximum RAM amount
512 MB
640 MB
Memory bus width
384 Bit
320 Bit
Memory clock speed
1080 MHz
1584 MHz
Memory bandwidth
103.7 GB/s
63.36 GB/s
Display Connectors
2x DVI, 1x S-Video
2x DVI, 1x S-Video
DirectX
11.1 (10_0)
11.1 (10_0)
CUDA
+
+
OpenCL
1.1
1.1
OpenGL
3.3
3.3
Shader Model
4.0
4.0
Vulkan
N/A
N/A