GeForce 8800 Ultra and GeForce GT 640 OEM - video card comparison
GeForce 8800 Ultra
GeForce GT 640 OEM
Architecture
Tesla (2006−2010)
Kepler (2012−2018)
GPU code name
G80
GK107
Market segment
Desktop
Desktop
Release date
May 2007
April 2012
Interface
PCIe 1.0 x16
PCIe 3.0 x16
Supplementary power connectors
2x 6-pin
None
SLI options
+
-
Core clock speed
612 MHz
797 MHz
CUDA cores
612
-
Floating-point performance
387.1 gflops
612.1 gflops
Manufacturing process technology
90 nm
28 nm
Number of transistors
681 million
1,270 million
Pipelines / CUDA cores
128
384
Power consumption (TDP)
171 Watt
50 Watt
Texture fill rate
39.2 billion/sec
25.50
Memory type
GDDR3
DDR3
Maximum RAM amount
512 MB
2 GB
Memory bus width
384 Bit
128 Bit
Memory clock speed
1080 MHz
1782 MHz
Memory bandwidth
103.7 GB/s
28.51 GB/s
Display Connectors
2x DVI, 1x S-Video
1x DVI, 1x HDMI, 1x DisplayPort
HDMI
-
+
DirectX
11.1 (10_0)
12 (11_0)
CUDA
+
3.0
OpenCL
1.1
1.2
OpenGL
3.3
4.6
Shader Model
4.0
5.1
Vulkan
N/A
1.1.126