Radeon HD 6870 vs Radeon Pro 555X

If you are going to buy a new graphics card and are choosing between Radeon HD 6870 and Radeon Pro 555X, there are a couple of things to consider. Cards with more VRAM in general perform better and allow you to play on higher graphics settings. Size also makes a difference. A model with a large heatsink can occupy up to three expansion slots on a motherboard. Be sure you have enough room in your PC case. When comparing GPUs with different architectures, more processing cores and even higher TFLOPS will not always translate to better performance. To help you decide which GPU you need, we have measured frame rates in a number of popular games. For more on how the Radeon HD 6870 stacks up against Radeon Pro 555X, check out specs charts below.

Radeon Pro 555X is a Laptop Graphics Card

Note: Radeon Pro 555X 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 Pro 555X here:

Main Specs

  Radeon HD 6870 Radeon Pro 555X
Power consumption (TDP) 151 Watt 75 Watt
Interface PCIe 2.0 x16 PCIe 3.0 x8
Supplementary power connectors 2x 6-pin None
Memory type GDDR5 GDDR5
Maximum RAM amount 1 GB 2 GB
Display Connectors 2x DVI, 1x HDMI, 2x mini-DisplayPort No outputs
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  • Radeon HD 6870 has 101% more power consumption, than Radeon Pro 555X.
  • Radeon HD 6870 is connected by PCIe 2.0 x16, and Radeon Pro 555X uses PCIe 3.0 x8 interface.
  • Radeon Pro 555X has 1 GB more memory, than Radeon HD 6870.
  • Radeon HD 6870 is used in Desktops, and Radeon Pro 555X - in Mobile workstations.
  • Radeon HD 6870 is build with Terascale 2 architecture, and Radeon Pro 555X - with Polaris.
  • Radeon HD 6870 is manufactured by 40 nm process technology, and Radeon Pro 555X - by 14 nm process technology.
  • Memory clock speed of Radeon Pro 555X is 4030 MHz higher, than Radeon HD 6870.

Game benchmarks

high / 1080p 10−12 16−18
ultra / 1080p 6−7 10−11
QHD / 1440p 1−2 4−5
4K / 2160p 4−5
low / 720p 24−27 30−35
medium / 1080p 12−14 21−24
The average gaming FPS of Radeon Pro 555X in Assassin's Creed Odyssey is 54% more, than Radeon HD 6870.

Full Specs

  Radeon HD 6870 Radeon Pro 555X
Architecture Terascale 2 Polaris
Code name RV940 Barts Polaris 21
Type Desktop Mobile workstation
Release date 22 October 2010 5 June 2017
Pipelines 1120 768
Core clock speed 855 MHz
Boost Clock 900 MHz
Transistor count 1,700 million 3,000 million
Manufacturing process technology 40 nm 14 nm
Texture fill rate 50.40 43.54
Floating-point performance 2,016.0 gflops
Length 220 mm
Memory bus width 256 Bit 128 Bit
Memory clock speed 1050 MHz 5080 MHz
Memory bandwidth 134.4 GB/s 81.6 GB/s
Shared memory - -
DirectX 12 (12_0)
Shader Model 5.0 6.4
OpenGL 4.4 4.6
OpenCL 1.2 2.0
Vulkan 1.2.131
FreeSync +
Bus support PCIe 2.0 x16
HDMI +
Bitcoin / BTC (SHA256) 213 Mh/s
Laptop size large
Eyefinity +
Design reference
CrossFire +
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