Radeon HD 6990 vs Radeon R9 M270X

Find out if it is worth upgrading your current GPU setup by comparing Radeon HD 6990 and Radeon R9 M270X. 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 6990 and Radeon R9 M270X. 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.

Main Specs

  Radeon HD 6990 Radeon R9 M270X
Power consumption (TDP) 375 Watt
Interface PCIe 2.0 x16 PCIe 3.0 x16
Supplementary power connectors 2x 8-pin
Memory type GDDR5 GDDR5
Maximum RAM amount 2 GB 4 GB
Display Connectors 1x DVI, 4x mini-DisplayPort No outputs
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  • Radeon HD 6990 is connected by PCIe 2.0 x16, and Radeon R9 M270X uses PCIe 3.0 x16 interface.
  • Radeon R9 M270X has 2 GB more memory, than Radeon HD 6990.
  • Both cards are used in Desktops.
  • Radeon HD 6990 is build with TeraScale 3 architecture, and Radeon R9 M270X - with GCN 1.0.
  • Core clock speed of Radeon HD 6990 is 105 MHz higher, than Radeon R9 M270X.
  • Radeon HD 6990 is manufactured by 40 nm process technology, and Radeon R9 M270X - by 28 nm process technology.
  • Memory clock speed of Radeon HD 6990 is 3875 MHz higher, than Radeon R9 M270X.

Game benchmarks

high / 1080p 14−16 6−7
ultra / 1080p 9−10 4−5
QHD / 1440p 3−4 0−1
low / 720p 30−35 16−18
medium / 1080p 18−20 8−9
The average gaming FPS of Radeon HD 6990 in Assassin's Creed Odyssey is 111% more, than Radeon R9 M270X.

Full Specs

  Radeon HD 6990 Radeon R9 M270X
Architecture TeraScale 3 GCN 1.0
Code name Antilles Venus
Type Desktop Desktop
Release date 8 March 2011 21 March 2014
Pipelines 1536 640
Core clock speed 830 MHz 725 MHz
Boost Clock 775 MHz
Transistor count 2,640 million 1,500 million
Manufacturing process technology 40 nm 28 nm
Texture fill rate 79.68 31.00
Floating-point performance 2x 2,549.8 gflops 1,536 gflops
Length 295 mm
Memory bus width 256 Bit 128 Bit
Memory clock speed 5000 MHz 1125 MHz
Memory bandwidth 160.0 GB/s 72 GB/s
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
Bitcoin / BTC (SHA256) 265 Mh/s
Eyefinity +
HD3D +
PowerTune +
DualGraphics +
ZeroCore +
Switchable graphics +
Mantle +
Ethereum / ETH (DaggerHashimoto) 24 Mh/s
Compute units 10
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