Iris Plus Graphics 645 vs Radeon HD 6870

If you are going to buy a new graphics card and are choosing between Iris Plus Graphics 645 and Radeon HD 6870, 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 Iris Plus Graphics 645 stacks up against Radeon HD 6870, check out specs charts below.

Iris Plus Graphics 645 is a Laptop Graphics Card

Note: Iris Plus Graphics 645 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 Iris Plus Graphics 645 here:

Main Specs

  Iris Plus Graphics 645 Radeon HD 6870
Power consumption (TDP) 15 Watt 151 Watt
Interface PCIe 3.0 x1 PCIe 2.0 x16
Supplementary power connectors 2x 6-pin
Memory type DDR3/DDR4 GDDR5
Maximum RAM amount 1 GB
Display Connectors No outputs 2x DVI, 1x HDMI, 2x mini-DisplayPort
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  • Radeon HD 6870 has 906% more power consumption, than Iris Plus Graphics 645.
  • Iris Plus Graphics 645 is connected by PCIe 3.0 x1, and Radeon HD 6870 uses PCIe 2.0 x16 interface.
  • Iris Plus Graphics 645 is used in Laptops, and Radeon HD 6870 - in Desktops.
  • Iris Plus Graphics 645 is build with Gen. 9.5 Coffee Lake architecture, and Radeon HD 6870 - with Terascale 2.
  • Iris Plus Graphics 645 is manufactured by 14 nm process technology, and Radeon HD 6870 - by 40 nm process technology.

Game benchmarks

high / 1080p 4−5 10−12
ultra / 1080p 2−3 6−7
QHD / 1440p 0−1 1−2
low / 720p 12−14 24−27
medium / 1080p 5−6 12−14
The average gaming FPS of Radeon HD 6870 in Assassin's Creed Odyssey is 133% more, than Iris Plus Graphics 645.

Full Specs

  Iris Plus Graphics 645 Radeon HD 6870
Architecture Gen. 9.5 Coffee Lake Terascale 2
Code name Kaby Lake GT3e RV940 Barts
Type Laptop Desktop
Release date 10 July 2019 22 October 2010
Pipelines 48 1120
Core clock speed 300 MHz
Boost Clock 1150 MHz 900 MHz
Transistor count 1,700 million
Manufacturing process technology 14 nm 40 nm
Texture fill rate 50.40 50.40
Floating-point performance 2,016.0 gflops
Length 220 mm
Memory bus width 256 Bit
Memory clock speed 1050 MHz
Memory bandwidth 134.4 GB/s
Shared memory + -
DirectX 12 (12_1)
Shader Model 6.4 5.0
OpenGL 4.6 4.4
OpenCL 2.1 1.2
Vulkan 1.1.103
Bus support PCIe 2.0 x16
HDMI +
Bitcoin / BTC (SHA256) 213 Mh/s
Eyefinity +
Design reference
CrossFire +
Quick Sync +
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