NVIDIA · GeForce GT 600 Series

NVIDIA GeForce GT 640

The NVIDIA GeForce GT 640 is a graphics card released on April 24, 2012, built on the Kepler architecture using a 28 nm process. It has 384 shading units, 4 GB of DDR3 memory on a 128-bit bus, 28.5 GB/s of memory bandwidth, a boost clock of 902 MHz and a 65 W board power rating. It scores 1,162 in the PassMark G3D benchmark. It supports DirectX 11 and OpenGL 4.5.

KeplerGK107-300-A228 nm

9/10 key specs recorded · 26 facts

Depth: 37 recorded fields, 5 PassMark workloads

Specification data last verified October 1, 2026 against PassMark Videocard Benchmark and Wikipedia GPU list tables (wikigrid-2026-09). Coverage: 9 of 10 tracked specifications recorded.

PassMark Videocard Benchmark PassMark Videocard Benchmark Wikipedia GPU list tables (wikigrid-2026-09)

Shading units

384cores

Memory

4 GB

DDR3 · 128-bit

Boost clock

n/a

902 MHz base

Board power

65 W

Performance

The NVIDIA GeForce GT 640 scores 1,162 in the PassMark G3D benchmark, higher than 57.3% of the 2,658 GPUs benchmarked (PassMark rank #1,310), measured across 5,078 submitted results. Its PassMark G2D score is 298.

PassMark G3D Mark

1,162

Rank #1,310
Faster than 57.3% of 2,658 GPUs
5,078 samples

0relative to the fastest GPU on record (41,928)

PassMark workload tests

DirectX 9 24 fps

reference: fastest recorded 526 fps · faster than 41% of 1,675 GPUs

DirectX 10 4 fps

reference: fastest recorded 231 fps · faster than 32.1% of 1,602 GPUs

DirectX 11 10 fps

reference: fastest recorded 362 fps · faster than 31.2% of 1,430 GPUs

DirectX 12 5 fps

reference: fastest recorded 213 fps · faster than 13.4% of 1,274 GPUs

GPU Compute 627 ops/s

reference: fastest recorded 26,591 ops/s · faster than 33.7% of 1,447 GPUs

Averages of PassMark PerformanceTest submissions; frames/sec are PassMark test-scene rates, not game FPS. Tests PassMark does not report for this card are omitted. PassMark listing

In the PassMark workload tests the NVIDIA GeForce GT 640 averages DirectX 9 24 fps, DirectX 10 4 fps, DirectX 11 10 fps, DirectX 12 5 fps and GPU Compute 627 ops/s, across 5,078 submitted results. Frames per second are PassMark test-scene rates, not game frame rates.

As stated by PassMark

Category Desktop

Bus interface PCIe 3.0 x16

Max memory 4 GB

Core clock 900 MHz

Memory clock 891 MHz

DirectX 11.0

OpenGL 4.5

Max TDP 65 W

First benchmarked 2011-12-24

Samples 5,078

PassMark listing (collected 2026-09-30)

PassMark's own listing for the NVIDIA GeForce GT 640 states the PCIe 3.0 x16 interface, up to 4 GB of memory, a core clock of 900 MHz, DirectX 11.0 and OpenGL 4.5, first benchmarked on 2011-12-24. These are PassMark's figures, shown separately from the specification tables above.

Not to be confused with

This page covers the NVIDIA GeForce GT 640 specifically. It is a different product from NVIDIA GeForce GT 640M, NVIDIA GeForce GT 640M LE, NVIDIA GeForce GT 640 Rev. 2, NVIDIA GeForce GT 640 OEM Rebrand, which have their own specifications. Check the exact model name before comparing figures.

Graphics processor

Architecture Kepler

Codename GK107-300-A2

Chip Not recorded

Process node 28 nm

Transistors Not recorded

Die size Not recorded

The NVIDIA GeForce GT 640 is based on the Kepler architecture, uses the GK107-300-A2 graphics processor and is manufactured on a 28 nm process.

Shader configuration

Shading units 384

Compute units Not recorded

Streaming multiprocessors Not recorded

Execution units Not recorded

Texture units (TMUs) 32

Render output units (ROPs) Not recorded

Ray tracing cores Not recorded

Tensor / AI cores Not recorded

XMX engines Not recorded

Infinity cache Not recorded

The NVIDIA GeForce GT 640 has 384 shading units and 32 texture mapping units.

The NVIDIA GeForce GT 640 does not use XMX engines; those are specific to Intel Arc graphics. Infinity Cache is an AMD architectural feature and does not apply to the NVIDIA GeForce GT 640. Feex has no recorded ray tracing core count for the NVIDIA GeForce GT 640.

Clock speeds

Base clock 902 MHz

Boost clock Not recorded

Game clock Not recorded

Memory clock Not recorded

Effective memory clock Not recorded

The NVIDIA GeForce GT 640 runs at a base clock of 902 MHz.

Memory

Size 4 GB

Type DDR3

Bus width 128-bit

Bandwidth 28.5 GB/s

The NVIDIA GeForce GT 640 is equipped with 4 GB of DDR3 memory, uses a 128-bit memory bus and delivers 28.5 GB/s of memory bandwidth.

Board and power

The NVIDIA GeForce GT 640 has a board power rating of 65 W and it connects over PCIe 3.0 x16.

Board power (TDP) 65 W

Total board power Not recorded

Suggested PSU Not recorded

Power connectors Not recorded

Slot width Not recorded

Length Not recorded

Width Not recorded

Height Not recorded

Cooler Not recorded

Max temperature Not recorded

Bus interface PCIe 3.0 x16

Market

Launched April 24, 2012

Launch price Not recorded

Status Not recorded

Form factor Not recorded

Segment Desktop

Series GeForce GT 600 Series

The NVIDIA GeForce GT 640 was released on April 24, 2012.

Benchmarks

PassMark G3D 1,162

PassMark G2D 298

Rank #1,310

Samples 5,078

Graphics and compute APIs

The NVIDIA GeForce GT 640 supports DirectX 11 and OpenGL 4.5.

DirectX 11

OpenGL 4.5

Feex has no recorded CUDA compute capability for the NVIDIA GeForce GT 640. Feex has no recorded Vulkan version for the NVIDIA GeForce GT 640. Feex has no recorded OpenCL version for the NVIDIA GeForce GT 640.

Frequently asked questions

How much VRAM does the NVIDIA GeForce GT 640 have?

The NVIDIA GeForce GT 640 has 4 GB of DDR3 memory on a 128-bit bus. Its memory bandwidth is 28.5 GB/s.

How much power does the NVIDIA GeForce GT 640 use and what power supply does it need?

The NVIDIA GeForce GT 640 has a board power rating of 65 W.

How fast is the NVIDIA GeForce GT 640?

The NVIDIA GeForce GT 640 scores 1,162 in the PassMark G3D benchmark, higher than 57.3% of the 2,658 GPUs benchmarked. Its PassMark rank is #1,310. In the PassMark DirectX 12 test it averages 5 fps.