NVIDIA GeForce 9800 GX2 vs GT 640
Comparison of GeForce 9800 GX2 and GeForce GT 640 architecture, market type and release date.
GeForce 9800 GX2 and GeForce GT 640's general performance parameters such as number of shaders, GPU core clock, manufacturing process, texturing and calculation speed. These parameters indirectly speak of GeForce 9800 GX2 and GeForce GT 640's performance, but for precise assessment you have to consider its benchmark and gaming test results.
256 (128 per GPU)
Core clock speed
Manufacturing process technology
Power consumption (TDP)
Maximum GPU temperature
Texture fill rate
76.8 billion / sec
28.86 GTexel / s
2x 384.0 gflops
Compatibility, dimensions and requirements
Information on GeForce 9800 GX2 and GeForce GT 640 compatibility with other computer components. Useful when choosing a future computer configuration or upgrading an existing one. For desktop video cards it's interface and bus (motherboard compatibility), additional power connectors (power supply compatibility).
PCIe 2.0 x16
PCIe 3.0 x16
10.5" (26.7 cm)
Supplementary power connectors
6-pin & 8-pin
Parameters of memory installed on GeForce 9800 GX2 and GeForce GT 640: its type, size, bus, clock and resulting bandwidth. Note that GPUs integrated into processors don't have dedicated memory and use a shared part of system RAM.
Maximum RAM amount
2x 512 MB
Memory bus width
Memory clock speed
128 (64 per GPU)
28.51 GB / s
Video outputs and ports
Types and number of video connectors present on GeForce 9800 GX2 and GeForce GT 640.
2x DVI, 1x HDMI
1x DVI, 1x HDMI, 1x DisplayPort
HDMIDual Link DVI
Multi monitor support
Maximum VGA resolution
Audio input for HDMI
S / PDIF
Technological solutions and APIs supported by GeForce 9800 GX2 and GeForce GT 640. You'll probably need this information if you need some particular technology for your purposes.
APIs supported by GeForce 9800 GX2 and GeForce GT 640, sometimes including their particular versions.
Non-gaming benchmarks performance of GeForce 9800 GX2 and GeForce GT 640. Note that overall benchmark performance is measured in points in 0-100 range.
Overall benchmark performance
9800 GX2 4.14
GT 640 6.65 +60.6%
9800 GX2 797
GT 640 1280 +60.6%
Cryptocurrency mining performance of GeForce 9800 GX2 and GeForce GT 640. Usually measured in megahashes per second.
Bitcoin / BTC (SHA256)
Let's see how good GeForce 9800 GX2 and GeForce GT 640 are for gaming. Particular gaming benchmark results are measured in FPS.
Advantages of NVIDIA GeForce 9800 GX2
Wider memory bus (512 vs 128 bit)
Higher memory bandwidth (128 vs 28.51 GB/s)
PhysX (hardware acceleration of physical simulation engine named PhysX)
CUDA (Compute Unified Device Architecture - an API for video card computing power usage in tasks different from 3D graphics processing. Can be used for physics simulation for instance)
SLI (Scalable Link Interface - a technology for uniting several NVIDIA GPUs processing power in one PC)
Advantages of NVIDIA GeForce GT 640
60.6% faster (about 1.5 times) in synthetic tests
Much newer (5 June 2012 vs 18 March 2008)
Cheaper ($99 vs $599)
More pipelines (384 vs 128)
Finer manufacturing process technology (28 vs 65 nm)
Less power hungry (65 vs 197 watts)
So, 9800 GX2 or GT 640?
Judging by the results of synthetic and gaming tests, Technical City recommends NVIDIA GeForce GT 640.
Should you still have questions on choice between GeForce 9800 GX2 and GeForce GT 640, ask them in Comments section, and we shall answer.