Radeon HD 6990 vs Radeon R9 280

Find out if it is worth upgrading your current GPU setup by comparing Radeon HD 6990 and Radeon R9 280. 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 280. 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 280
Power consumption (TDP) 375 Watt 200 Watt
Interface PCIe 2.0 x16 PCIe 3.0 x16
Supplementary power connectors 2x 8-pin 1 x 6-pin + 1 x 8-pin
Memory type GDDR5 GDDR5
Maximum RAM amount 2 GB 3 GB
Display Connectors 1x DVI, 4x mini-DisplayPort 2x DVI, 1x HDMI, 2x mini-DisplayPort
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  • Radeon HD 6990 has 87% more power consumption, than Radeon R9 280.
  • Radeon HD 6990 is connected by PCIe 2.0 x16, and Radeon R9 280 uses PCIe 3.0 x16 interface.
  • Radeon R9 280 has 1 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 280 - with GCN 1.0.
  • Radeon HD 6990 is manufactured by 40 nm process technology, and Radeon R9 280 - by 28 nm process technology.
  • Radeon HD 6990 is 20 mm longer, than Radeon R9 280.
  • Memory clock speed of Radeon HD 6990 is 3750 MHz higher, than Radeon R9 280.

Game benchmarks

high / 1080p 14−16 35−40
ultra / 1080p 9−10 21−24
QHD / 1440p 3−4 16−18
4K / 2160p 10−11
low / 720p 30−35 60−65
medium / 1080p 18−20 40−45
The average gaming FPS of Radeon R9 280 in Assassin's Creed Odyssey is 140% more, than Radeon HD 6990.

Full Specs

  Radeon HD 6990 Radeon R9 280
Architecture TeraScale 3 GCN 1.0
Code name Antilles Tahiti
Type Desktop Desktop
Release date 8 March 2011 4 March 2014
Pipelines 1536 1792
Core clock speed 830 MHz
Boost Clock 933 MHz
Transistor count 2,640 million 4,313 million
Manufacturing process technology 40 nm 28 nm
Texture fill rate 79.68 104.5
Floating-point performance 2x 2,549.8 gflops 3,344 gflops
Length 295 mm 275 mm
Memory bus width 256 Bit 384 Bit
Memory clock speed 5000 MHz 1250 MHz
Memory bandwidth 160.0 GB/s 240 GB/s
DirectX 11.2 (11_0)
Shader Model 5.0 5.1
OpenGL 4.4 4.6
OpenCL 1.2 1.2
Vulkan N/A +
FreeSync +
Bus support PCIe 3.0
HDMI +
Bitcoin / BTC (SHA256) 265 Mh/s 408 Mh/s
Eyefinity +
HD3D +
TrueAudio +
Design reference
CrossFire +
DDMA audio +
Ethereum / ETH (DaggerHashimoto) 24 Mh/s 21.5 Mh/s
LiquidVR +
TressFX +
UVD +
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