Radeon HD 6990M vs Radeon R9 M270X

When choosing between Radeon HD 6990M and Radeon R9 M270X, it is worth examining the specifications of the models in detail. Do they meet the recommended requirements of modern games and software? Storage capacity, form factor, TDP, available ports, warranty and manufacturer support are all important. For example, the size of a PC case can limit the maximum thickness and length of the card. Often, instead of the factory overclocked card and RGB backlight, it is better to choose a reference model with a more efficient GPU. And make sure that your current power supply unit has the correct connection pins (using adapters is not recommended). This GPUs compare tool is meant to help you to choose the best graphics card for your build. Let's find out the difference between Radeon HD 6990M and Radeon R9 M270X.

Radeon HD 6990M is a Laptop Graphics Card

Note: Radeon HD 6990M 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 HD 6990M here:

Main Specs

  Radeon HD 6990M Radeon R9 M270X
Power consumption (TDP) 100 Watt
Interface MXM-B (3.0) PCIe 3.0 x16
Supplementary power connectors None
Memory type GDDR5 GDDR5
Maximum RAM amount 2 GB 4 GB
Display Connectors No outputs No outputs
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  • Radeon HD 6990M is connected by MXM-B (3.0), and Radeon R9 M270X uses PCIe 3.0 x16 interface.
  • Radeon R9 M270X has 2 GB more memory, than Radeon HD 6990M.
  • Radeon HD 6990M is used in Laptops, and Radeon R9 M270X - in Desktops.
  • Radeon HD 6990M is build with Terascale 2 architecture, and Radeon R9 M270X - with GCN 1.0.
  • Core clock speed of Radeon R9 M270X is 10 MHz higher, than Radeon HD 6990M.
  • Radeon HD 6990M is manufactured by 40 nm process technology, and Radeon R9 M270X - by 28 nm process technology.
  • Memory clock speed of Radeon R9 M270X is 225 MHz higher, than Radeon HD 6990M.

Game benchmarks

high / 1080p 14−16 6−7
ultra / 1080p 8−9 4−5
QHD / 1440p 3−4 0−1
low / 720p 30−33 16−18
medium / 1080p 16−18 8−9
The average gaming FPS of Radeon HD 6990M in Assassin's Creed Odyssey is 100% more, than Radeon R9 M270X.

Full Specs

  Radeon HD 6990M Radeon R9 M270X
Architecture Terascale 2 GCN 1.0
Code name Blackcomb XTX Venus
Type Laptop Desktop
Release date 12 July 2011 21 March 2014
Pipelines 1120 640
Core clock speed 715 MHz 725 MHz
Boost Clock 775 MHz
Transistor count 1,700 million 1,500 million
Manufacturing process technology 40 nm 28 nm
Texture fill rate 40.04 31.00
Floating-point performance 1,601.6 gflops 1,536 gflops
Memory bus width 256 Bit 128 Bit
Memory clock speed 900 MHz 1125 MHz
Memory bandwidth 115.2 GB/s 72 GB/s
Shared memory -
DirectX 11.2 (11_0)
Shader Model 5.0 5.1
OpenGL 4.4 4.4
OpenCL 1.2 Not Listed
Vulkan N/A
FreeSync +
Bus support PCIe 3.0 x16
Laptop size large
Eyefinity +
HD3D +
PowerTune +
DualGraphics +
ZeroCore +
Switchable graphics +
Mantle +
Compute units 10
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