Radeon HD 6990M Crossfire vs Radeon R9 M275

Find out if it is worth upgrading your current GPU setup by comparing Radeon HD 6990M Crossfire and Radeon R9 M275. 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 Crossfire and Radeon R9 M275. 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 Crossfire and Radeon R9 M275 are Laptop Graphics Cards

Note: Radeon HD 6990M Crossfire and Radeon R9 M275 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 Crossfire or Radeon R9 M275 here:

Main Specs

  Radeon HD 6990M Crossfire Radeon R9 M275
Interface PCIe 3.0 x16
Memory type GDDR5 GDDR5
Maximum RAM amount 2x2 GB 4 GB
Display Connectors No outputs
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  • Radeon R9 M275 has 2 GB more memory, than Radeon HD 6990M Crossfire.
  • Both cards are used in Laptops.
  • Radeon HD 6990M Crossfire is build with Terascale 2 architecture, and Radeon R9 M275 - with GCN.
  • Core clock speed of Radeon R9 M275 is 210 MHz higher, than Radeon HD 6990M Crossfire.
  • Radeon HD 6990M Crossfire is manufactured by 40 nm process technology, and Radeon R9 M275 - by 28 nm process technology.
  • Memory clock speed of Radeon R9 M275 is 3600 MHz higher, than Radeon HD 6990M Crossfire.

Game benchmarks

high / 1080p 35−40 0−1
ultra / 1080p 21−24
QHD / 1440p 16−18 0−1
4K / 2160p 10−11
low / 720p 60−65 12−14
medium / 1080p 40−45 3−4
The average gaming FPS of Radeon HD 6990M Crossfire in Assassin's Creed Odyssey is 550% more, than Radeon R9 M275.

Full Specs

  Radeon HD 6990M Crossfire Radeon R9 M275
Architecture Terascale 2 GCN
Code name Blackcomb XTX Venus
Type Laptop Laptop
Release date 12 July 2011 1 August 2014
Pipelines 2240 640
Core clock speed 715 MHz 925 MHz
Boost Clock 925 MHz
Transistor count 2x1700 Million 1,500 million
Manufacturing process technology 40 nm 28 nm
Texture fill rate 37.00
Floating-point performance 1,184 gflops
Memory bus width 256 Bit 128 Bit
Memory clock speed 900 MHz 4500 MHz
Memory bandwidth 64 GB/s
Shared memory - -
DirectX DirectX 11, Shader 5.0 12 (11_1)
Shader Model 5.1
OpenGL 4.6
OpenCL 1.2
Vulkan 1.2.131
Bitcoin / BTC (SHA256) 122 Mh/s
Laptop size large large
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