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Gaming Performance Comparison

Recommended System Requirements
Game 645 GT3e Radeon HD 8850M
Cyberpunk 2077 381% 528%
Hitman 3 526% 717%
Assassins Creed: Valhalla 340% 474%
Resident Evil 8 381% 528%
FIFA 21 143% 217%
Grand Theft Auto VI 577% 783%
Call of Duty: Black Ops Cold War 326% 456%
The Medium 500% 683%
Genshin Impact 381% 528%
Far Cry 6 596% 808%

In terms of overall gaming performance, the graphical capabilities of the Intel 645 GT3e are noticeably better than the AMD Radeon HD 8850M.

The Radeon HD 8850M has a 325 MHz higher core clock speed and 16 more Texture Mapping Units than the 645 GT3e. This results in the Radeon HD 8850M providing 17.8 GTexel/s better texturing performance. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The Radeon HD 8850M has a 325 MHz higher core clock speed and 13 more Render Output Units than the 645 GT3e. This results in the Radeon HD 8850M providing 9.1 GPixel/s better pixeling performance. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The 645 GT3e was released over three years more recently than the Radeon HD 8850M, and so the 645 GT3e is likely to have far better driver support, meaning it will be much more optimized and ultimately superior to the Radeon HD 8850M when running the latest games.

The Radeon HD 8850M has 2048 MB video memory, but the 645 GT3e does not have an entry, so the two GPUs cannot be reliably compared in this area.

The 645 GT3e has 384 Shader Processing Units and the Radeon HD 8850M has 640. However, the actual shader performance of the 645 GT3e is 442 and the actual shader performance of the Radeon HD 8850M is 496. The Radeon HD 8850M having 54 better shader performance and an altogether better performance when taking into account other relevant data means that the Radeon HD 8850M delivers a noticeably smoother and more efficient experience when processing graphical data than the 645 GT3e.

The 645 GT3e transistor size technology is 14 nm (nanometers) smaller than the Radeon HD 8850M. This means that the 645 GT3e is expected to run slightly cooler and achieve higher clock frequencies than the Radeon HD 8850M.

The 645 GT3e requires 15 Watts to run and the Radeon HD 8850M requires 45 Watts. The Radeon HD 8850M requires 30 Watts more than the 645 GT3e to run. The difference is not significant enough for the Radeon HD 8850M to have a noticeably larger impact on your yearly electricity bills than the 645 GT3e.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed300 MHzvs625 MHz
Boost Clock1150 MHzvs775 MHz
ArchitectureKaby LakeGCN 1.1 Venus PRO
OC Potential - vs Fair
Driver Support - vs -
Release Date01 Jun 2019vs01 Apr 2013
GPU LinkGD LinkGD Link

Resolution Performance

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GPU Memory

MemoryN/Avs2048 MB
Memory Speed-vs1000 MHz
Memory Bus-vs128 Bit
Memory Type-vsDDR3
Memory Bandwidth-vs32GB/sec
L2 Cache 0 KB vs green tick 256 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%

GPU Display

Shader Processing Units384vs640
Actual Shader Performance21%vs24%
Texture Mapping Units24vs40
Texture Rate7.2 GTexel/svs25 GTexel/s
Render Output Units3vs16
Pixel Rate0.9 GPixel/svs10 GPixel/s

GPU Outputs

Max Digital Resolution (WxH)-vs4096x2160
VGA Connections0vs0
DVI Connections0vs0
HDMI Connections0vs0
DisplayPort Connections0vs-

GPU Power Requirements

Max Power15 Wattsvs45 Watts
Recommended PSU--

GPU Features

Shader Model6.4vs5.0
Open GL4.6vs4.2
Open CL-vs-
Notebook GPUyesyes

GPU Supporting Hardware

Recommended Processor-Intel Core i5-3360M 2.8GHz
Recommended RAM8 GBvs8 GB
Maximum Recommended Gaming Resolution1366x768vs1366x768

Gaming Performance Value

Performance Value

GPU Mini Review

Mini ReviewOverview
Intel Iris Plus Graphics 645 GT3e are integrated graphics in some of Intel's Kaby Lake mobile processors. It can be found in Intel Core i5-8257U and the Intel Core i5-8557U

The Kaby Lake architecture succeeds the Skylake architecture and aims for increased CPU and graphics performance, via the same power requirements. It includes support for DirectX 12.1, OpenCL 2.1 and OpenGL 4.6.
The central unit initially runs at 300MHz and goes up to 1150MHz, in turbo mode in the Intel Core i5-8557U.

Because Performance depends heavily on the Memory Bandwidth, it may vary heavily from System to System.
Best case scenario, expect performance identical to a dedicated AMd HD 6790.
Radeon HD 8850M is a Performance Mobile Graphics Card based on the Second Revision of the GCN Architecture.

The GCN 1.1 Release adds support for AMD's TrueAudio Technology which does calculations of audio effects "better" than the CPU and further improves the Powertune Technology.

It equips a GPU codenamed Venus PRO which has 10 Compute Units activated and thus offers 640 Shader Processing Units, 40 TMUs and 16 ROPs. The Central Unit Initially Operates at 625MHz and goes up to 775MHz, in Turbo Mode.

The GPU accesses a 2GB frame buffer of DDR3, through a 128-bit memory interface. The size of the frame buffer is exaggerated and in no way benefits the GPU. The memory clock operates at 1000MHz.

DirectX 11.0 Support (11.0 Hardware Default) and support for Crossfire, PowerTune Technology, Eyefinity, App Acceleration, HD3D, ZeroCore Power and other technologies.

Power Consumption
With a rated board TDP of 45W, it is suited for 17" or larger laptops.

Gaming benchmarks put its performance somewhat above NVIDIA's GeForce GT 750M.

System Suggestions
We recommend a Decent Processor (Intel Core i5 Mobile) and 8GB of RAM for a system with Radeon HD 8850M.
Recommended CPU
Possible GPU Upgrades
GPU Variants