NVIDIA · Kepler (derived from codename prefix) · 2012

GeForce GT 640 OEM

Memory1 GB33 of 93 in GeForce GT
Power50 W28 of 90 by higher draw in GeForce GT
Shaders3841 of 98 in GeForce GT

Silicon, made visible

Die area is drawn against the largest recorded die in the catalog. Shader dots use a labeled, card-specific ratio so both early and modern GPUs remain legible.

118 mm² die · 384 shadersDie area drawn to scale against the catalog maximum of 1,540 square millimeters. Each dot = 4 shaders.118 mm² die · 384 shadersEach dot = 4 shadersDashed frame = largest catalog die (1,540 mm²)

Specifications

Memory

Capacity
1 GB
Type
GDDR5
Bus width
128 bit
Memory clock
891 MHz
Bandwidth
57.02 GB/s

Compute

Shaders
384
SM count
2
TMUs
32
ROPs
16
FP32
612.096 GFLOPS
FP64
25.504 GFLOPS
Pixel fill rate
12.75 GP/s
Texture fill rate
25.5 GT/s

Clocks

Boost clock
797 MHz

Board

TDP
50 W
Bus interface
PCIe 3.0 x16
External power required
No
Form factor
desktop

Physical

Architecture
Kepler (derived from codename prefix)
Codename
GK107-320-A2
Process
28 nm
Transistors
1.27 billion
Die size
118 mm²
Series
GeForce GT
Launch date
April 24, 2012

Not recorded by the source: generation, base clock and launch msrp.

Catalog context

Within its series, the GeForce GT 640 OEM ranks 14th of 53 for FP32 throughput and 33rd of 93 for memory capacity. Its 50 W TDP is within the 75 W PCIe slot-power ceiling.

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Source: Wikipedia, revision 1369488585 · catalog loaded 2026-08-16