NVIDIA · GeForce GTX 600 Series

NVIDIA GeForce GTX 645

The NVIDIA GeForce GTX 645 is a graphics card released on April 22, 2013, built on the Kepler architecture using a 28 nm process. It has 576 shading units, 1 GB of GDDR5 memory on a 128-bit bus, 64.0 GB/s of memory bandwidth, a boost clock of 824 MHz and a 65 W board power rating. It scores 1,875 in the PassMark G3D benchmark. It supports DirectX 11 and OpenGL 4.5.

KeplerGK10628 nm

9/10 key specs recorded · 31 facts

Depth: 40 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

576cores

Memory

1 GB

GDDR5 · 128-bit

Boost clock

n/a

824 MHz base

Board power

65 W

Performance

The NVIDIA GeForce GTX 645 scores 1,875 in the PassMark G3D benchmark, higher than 65% of the 2,658 GPUs benchmarked (PassMark rank #1,038), measured across 526 submitted results. Its PassMark G2D score is 427.

PassMark G3D Mark

1,875

Rank #1,038
Faster than 65% of 2,658 GPUs
526 samples

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

PassMark workload tests

DirectX 9 35 fps

reference: fastest recorded 526 fps · faster than 50.1% of 1,675 GPUs

DirectX 10 7 fps

reference: fastest recorded 231 fps · faster than 42.3% of 1,602 GPUs

DirectX 11 15 fps

reference: fastest recorded 362 fps · faster than 42.9% of 1,430 GPUs

DirectX 12 7 fps

reference: fastest recorded 213 fps · faster than 24.3% of 1,274 GPUs

GPU Compute 886 ops/s

reference: fastest recorded 26,591 ops/s · faster than 43.7% 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 GTX 645 averages DirectX 9 35 fps, DirectX 10 7 fps, DirectX 11 15 fps, DirectX 12 7 fps and GPU Compute 886 ops/s, across 526 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 1 GB

Core clock 823.5 MHz

Memory clock 1000 MHz

DirectX 11

OpenGL 4.5

Max TDP 64 W

First benchmarked 2013-05-12

Samples 526

PassMark listing (collected 2026-10-01)

PassMark's own listing for the NVIDIA GeForce GTX 645 states the PCIe 3.0 x16 interface, up to 1 GB of memory, a core clock of 823.5 MHz, DirectX 11 and OpenGL 4.5, first benchmarked on 2013-05-12. These are PassMark's figures, shown separately from the specification tables above.

Graphics processor

Architecture Kepler

Codename GK106

Chip Not recorded

Process node 28 nm

Transistors 2,540 M

Die size 221 mm²

The NVIDIA GeForce GTX 645 is based on the Kepler architecture, uses the GK106 graphics processor, is manufactured on a 28 nm process, contains 2,540 million transistors and has a die size of 221 mm².

Shader configuration

Shading units 576

Compute units Not recorded

Streaming multiprocessors Not recorded

Execution units Not recorded

Texture units (TMUs) 48

Render output units (ROPs) 16

Ray tracing cores Not recorded

Tensor / AI cores Not recorded

XMX engines Not recorded

Infinity cache Not recorded

The NVIDIA GeForce GTX 645 has 576 shading units, 48 texture mapping units and 16 render output units.

The NVIDIA GeForce GTX 645 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 GTX 645. Feex has no recorded ray tracing core count for the NVIDIA GeForce GTX 645.

Clock speeds

Base clock 824 MHz

Boost clock Not recorded

Game clock Not recorded

Memory clock Not recorded

Effective memory clock Not recorded

The NVIDIA GeForce GTX 645 runs at a base clock of 824 MHz.

Memory

Size 1 GB

Type GDDR5

Bus width 128-bit

Bandwidth 64.0 GB/s

The NVIDIA GeForce GTX 645 is equipped with 1 GB of GDDR5 memory, uses a 128-bit memory bus and delivers 64.0 GB/s of memory bandwidth.

Board and power

The NVIDIA GeForce GTX 645 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 22, 2013

Launch price Not recorded

Status Not recorded

Form factor Not recorded

Segment Desktop

Series GeForce GTX 600 Series

The NVIDIA GeForce GTX 645 was released on April 22, 2013.

Benchmarks

PassMark G3D 1,875

PassMark G2D 427

Rank #1,038

Samples 526

Graphics and compute APIs

The NVIDIA GeForce GTX 645 supports DirectX 11 and OpenGL 4.5.

DirectX 11

OpenGL 4.5

Feex has no recorded CUDA compute capability for the NVIDIA GeForce GTX 645. Feex has no recorded Vulkan version for the NVIDIA GeForce GTX 645. Feex has no recorded OpenCL version for the NVIDIA GeForce GTX 645.

Frequently asked questions

How much VRAM does the NVIDIA GeForce GTX 645 have?

The NVIDIA GeForce GTX 645 has 1 GB of GDDR5 memory on a 128-bit bus. Its memory bandwidth is 64.0 GB/s.

How much power does the NVIDIA GeForce GTX 645 use and what power supply does it need?

The NVIDIA GeForce GTX 645 has a board power rating of 65 W.

How fast is the NVIDIA GeForce GTX 645?

The NVIDIA GeForce GTX 645 scores 1,875 in the PassMark G3D benchmark, higher than 65% of the 2,658 GPUs benchmarked. Its PassMark rank is #1,038. In the PassMark DirectX 12 test it averages 7 fps.