GeForce GT 645M vs Radeon R9 280X

Find out if it is worth upgrading your current GPU setup by comparing GeForce GT 645M and Radeon R9 280X. Here you can take a closer look at graphics cards specs, such as core clock speed, memory type and size, display connectors, etc. The price, overall benchmark and gaming performances are usually defining factors when it comes to choosing between GeForce GT 645M and Radeon R9 280X. Make sure that the graphics card has compatible dimensions and will properly fit in your new or current computer case. Also these graphics cards may have different system power recommendations, so take that into consideration and upgrade your PSU if necessary.

GeForce GT 645M is a Laptop Graphics Card

Note: GeForce GT 645M is only used in laptop graphics. It has lower GPU clock speed compared to the desktop variant, which results in lower power consumption, but also 10-30% lower gaming performance. Check available laptop models with GeForce GT 645M here:

Main Specs

  GeForce GT 645M Radeon R9 280X
Power consumption (TDP) 32 Watt 250 Watt
Interface PCIe 3.0 x16 PCIe 3.0 x16
Supplementary power connectors 1 x 6-pin + 1 x 8-pin
Memory type DDR3\GDDR5 GDDR5
Maximum RAM amount 2 GB 3 GB
Display Connectors No outputs 2x DVI, 1x HDMI, 1x DisplayPort
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  • Radeon R9 280X has 681% more power consumption, than GeForce GT 645M.
  • Both video cards are using PCIe 3.0 x16 interface connection to a motherboard.
  • Radeon R9 280X has 1 GB more memory, than GeForce GT 645M.
  • GeForce GT 645M is used in Laptops, and Radeon R9 280X - in Desktops.
  • GeForce GT 645M is build with Kepler architecture, and Radeon R9 280X - with GCN.
  • GeForce GT 645M and Radeon R9 280X are manufactured by 28 nm process technology.

Game benchmarks

high / 1080p 1−2 35−40
ultra / 1080p 0−1 21−24
QHD / 1440p 0−1 16−18
4K / 2160p 10−11
low / 720p 12−14 60−65
medium / 1080p 2−3 40−45
The average gaming FPS of Radeon R9 280X in Assassin's Creed Odyssey is 840% more, than GeForce GT 645M.

Full Specs

  GeForce GT 645M Radeon R9 280X
Architecture Kepler GCN
Code name N13P-GS Thaiti XTL
Type Laptop Desktop
Release date 22 March 2012 8 October 2013
Pipelines 384 2048
Boost Clock 1000 MHz
Transistor count 1,270 million 4,313 million
Manufacturing process technology 28 nm 28 nm
Texture fill rate 22.7 billion/sec 128.0
Floating-point performance 544.5 gflops 4,096 gflops
Length 275 mm
Memory bus width 128bit 384 Bit
Memory clock speed 1800 MHz
Memory bandwidth 288 GB/s
Shared memory - -
DirectX 12 API
Shader Model 5.1 5.1
OpenGL 4.5 4.6
OpenCL 1.1 1.2
Vulkan 1.1.126 +
CUDA +
Monero / XMR (CryptoNight) 0.5 kh/s
FreeSync +
CUDA cores 384
Bus support PCI Express 2.0, PCI Express 3.0 PCIe 3.0
HDMI + +
HDCP +
Maximum VGA resolution Up to 2048x1536
3D Blu-Ray +
Bitcoin / BTC (SHA256) 19 Mh/s 494 Mh/s
Laptop size medium sized
Optimus +
Eyefinity +
HD3D +
TrueAudio +
Design reference
DisplayPort support +
CrossFire +
DDMA audio +
Decred / DCR (Decred) 1.07 Gh/s
Ethereum / ETH (DaggerHashimoto) 14.42 Mh/s
Zcash / ZEC (Equihash) 285 Sol/s
AppAcceleration +
LiquidVR +
TressFX +
UVD +
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