GeForce GTX 660 Ti vs Radeon R9 M390X

In this comparison between GeForce GTX 660 Ti and Radeon R9 M390X you will find out which graphics card performs better in today's games. Bear in mind that third-party versions may have more efficient cooling and higher clock speeds. This will increase cards' performance, though not by much. In addition to raw power you should also take into account the dimensions. Thicker models simply will not fit into a small mini-ITX case. The resolution of your monitor also affects the choice, since 4K gameplay requires a more powerful GPU. And don't overspend on the graphics card. Other parts of your build may also need to be upgraded, save some money for the CPU or power supply. For some people GeForce GTX 660 Ti will be the best choice, for others Radeon R9 M390X will be their preference. Study the comparison tables below and make your choice.

Radeon R9 M390X is a Laptop Graphics Card

Note: Radeon R9 M390X 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 Radeon R9 M390X here:

Main Specs

  GeForce GTX 660 Ti Radeon R9 M390X
Power consumption (TDP) 150 Watt 100 Watt
Interface PCIe 3.0 x16 PCIe 3.0 x16
Supplementary power connectors Two 6-pin None
Memory type GDDR5 GDDR5
Maximum RAM amount 2 GB 4 GB
Display Connectors 2x DVI, 1x HDMI, 1x DisplayPort No outputs
  Check Price Check Price
  • GeForce GTX 660 Ti has 50% more power consumption, than Radeon R9 M390X.
  • Both video cards are using PCIe 3.0 x16 interface connection to a motherboard.
  • Radeon R9 M390X has 2 GB more memory, than GeForce GTX 660 Ti.
  • GeForce GTX 660 Ti is used in Desktops, and Radeon R9 M390X - in Laptops.
  • GeForce GTX 660 Ti is build with Kepler architecture, and Radeon R9 M390X - with GCN 3.
  • Core clock speed of GeForce GTX 660 Ti is 192 MHz higher, than Radeon R9 M390X.
  • GeForce GTX 660 Ti and Radeon R9 M390X are manufactured by 28 nm process technology.

Game benchmarks

high / 1080p 21−24 21−24
ultra / 1080p 12−14 12−14
QHD / 1440p 8−9 8−9
4K / 2160p 5−6 5−6
low / 720p 40−45 40−45
medium / 1080p 27−30 27−30
GeForce GTX 660 Ti and Radeon R9 M390X have the same average FPS in Assassin's Creed Odyssey.

Full Specs

  GeForce GTX 660 Ti Radeon R9 M390X
Architecture Kepler GCN 3
Code name GK104 Amethyst (XT) / Tonga
Type Desktop Laptop
Release date 16 August 2012 9 June 2015
Pipelines 1344 2048
Core clock speed 915 MHz 723 MHz
Boost Clock 980 MHz
Transistor count 3,540 million 5,000 million
Manufacturing process technology 28 nm 28 nm
Texture fill rate 102.5 billion/sec 92.54
Floating-point performance 2,459.5 gflops 2,961 gflops
Length 9.5" (24.1 cm)
Memory bus width 192-bit GDDR5 256 Bit
Memory clock speed 6.0 GB/s
Memory bandwidth 144.2 GB/s 160.0 GB/s
Shared memory - -
DirectX 12 (11_0)
Shader Model 5.1 6.3
OpenGL 4.3 4.4
OpenCL 1.2 Not Listed
Vulkan 1.1.126 +
CUDA +
FreeSync +
CUDA cores 1344
Bus support PCI Express 3.0 PCIe 3.0
Height 4.376" (11.1 cm)
SLI options +
Multi monitor support 4 displays
HDMI +
HDCP +
Maximum VGA resolution 2048x1536
Audio input for HDMI Internal
3D Blu-Ray +
3D Gaming +
3D Vision +
Bitcoin / BTC (SHA256) 99 Mh/s
Laptop size large
Eyefinity +
HD3D +
PowerTune +
DualGraphics +
ZeroCore +
Switchable graphics +
Mantle +
  Check Price Check Price