Radeon HD 6990M vs Radeon R9 M390

Find out if it is worth upgrading your current GPU setup by comparing Radeon HD 6990M and Radeon R9 M390. 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 Radeon HD 6990M and Radeon R9 M390. 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.

Radeon HD 6990M and Radeon R9 M390 are Laptop Graphics Cards

Note: Radeon HD 6990M and Radeon R9 M390 are only used in laptop graphics. They have 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 HD 6990M or Radeon R9 M390 here:

Main Specs

  Radeon HD 6990M Radeon R9 M390
Power consumption (TDP) 100 Watt
Interface MXM-B (3.0)
Supplementary power connectors None
Memory type GDDR5 GDDR5
Maximum RAM amount 2 GB 2 GB
Display Connectors No outputs
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  • Radeon HD 6990M and Radeon R9 M390 have maximum RAM of 2 GB.
  • Both cards are used in Laptops.
  • Radeon HD 6990M is build with Terascale 2 architecture, and Radeon R9 M390 - with GCN.
  • Radeon HD 6990M is manufactured by 40 nm process technology, and Radeon R9 M390 - by 28 nm process technology.

Game benchmarks

high / 1080p 14−16 18−20
ultra / 1080p 8−9 10−11
QHD / 1440p 3−4 5−6
4K / 2160p 4−5
low / 720p 30−33 35−40
medium / 1080p 16−18 21−24
The average gaming FPS of Radeon R9 M390 in Assassin's Creed Odyssey is 26% more, than Radeon HD 6990M.

Full Specs

  Radeon HD 6990M Radeon R9 M390
Architecture Terascale 2 GCN
Code name Blackcomb XTX Pitcairn
Type Laptop Laptop
Release date 12 July 2011 9 June 2015
Pipelines 1120 1024
Core clock speed 715 MHz
Transistor count 1,700 million 5000 Million
Manufacturing process technology 40 nm 28 nm
Texture fill rate 40.04
Floating-point performance 1,601.6 gflops
Memory bus width 256 Bit 256 Bit
Memory clock speed 900 MHz
Memory bandwidth 115.2 GB/s
Shared memory - -
DirectX 11.2 (11_0)
Shader Model 5.0
OpenGL 4.4 4.4
OpenCL 1.2 Not Listed
Vulkan N/A
FreeSync +
Bus support PCIe 3.0
Bitcoin / BTC (SHA256) 242 Mh/s
Laptop size large large
Eyefinity +
HD3D +
PowerTune +
DualGraphics +
ZeroCore +
Switchable graphics +
Mantle +
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