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Gaming Performance Comparison

Recommended System Requirements
Game Radeon R9 M390X 4GB GeForce GTX 675M SLI
Red Dead Redemption 2 102% 98%
Cyberpunk 2077 177% 172%
Doom Eternal 74% 70%
Dragon Ball Z Kakarot 25% 22%
Call of Duty: Modern Warfare 102% 98%
Microsoft Flight Simulator 177% 172%
FIFA 20 8% 6%
Grand Theft Auto VI 208% 203%
Star Wars: Jedi - Fallen Order 177% 172%
Need For Speed Heat 102% 98%

In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GTX 675M SLI are marginally better than the AMD Radeon R9 M390X 4GB.

The R9 M390X has a 280 MHz higher core clock speed than the GTX 675M, but the GTX 675M has 48 more Texture Mapping Units than the R9 M390X. As a result, the GTX 675M exhibits a 7.4 GTexel/s better Texture Fill Rate than the R9 M390X. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The R9 M390X has a 280 MHz higher core clock speed than the GTX 675M, but the GTX 675M has 32 more Render Output Units than the R9 M390X. As a result, the GTX 675M exhibits a 10.9 GPixel/s better Pixel Fill Rate than the R9 M390X. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The R9 M390X was released over three years more recently than the GTX 675M, and so the R9 M390X is likely to have far better driver support, meaning it will be much more optimized and ultimately superior to the GTX 675M when running the latest games.

Both GPUs exhibit very powerful performance, so it probably isn't worth upgrading from one to the other, as both are capable of running even the most demanding games at the highest settings.

The Radeon R9 M390X 4GB and the GeForce GTX 675M SLI have the same amount of video memory, but are likely to provide slightly different experiences when displaying game textures at high resolutions.

The GTX 675M has 32 GB/sec greater memory bandwidth than the R9 M390X, which means that the memory performance of the GTX 675M is noticeably better than the R9 M390X.

The Radeon R9 M390X 4GB has 1280 Shader Processing Units and the GeForce GTX 675M SLI has 768. However, the actual shader performance of the R9 M390X is 1034 and the actual shader performance of the GTX 675M is 952. The R9 M390X having 82 better shader performance is not particularly notable, as altogether the GTX 675M performs better when taking into account other relevant data.

The R9 M390X transistor size technology is 12 nm (nanometers) smaller than the GTX 675M. This means that the R9 M390X is expected to run slightly cooler and achieve higher clock frequencies than the GTX 675M. While they exhibit similar graphical performance, the R9 M390X should consume less power than the GTX 675M.

The Radeon R9 M390X 4GB requires 100 Watts to run and the GeForce GTX 675M SLI requires 200 Watts. The GTX 675M requires 100 Watts more than the R9 M390X to run. The difference is significant enough that the GTX 675M may have an adverse affect on your yearly electricity bills in comparison to the R9 M390X.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed900 MHzvs620 MHz
Boost Clock950 MHzvs-
ArchitectureGCN 1.1 Neptune XTFermi GF114 (x2)
OC Potential Poor vs None
Driver Support Great vs -
Release Date09 Jun 2015vs22 Mar 2012
GPU LinkGD LinkGD Link

Resolution Performance

green tick vs -
green tick vs green tick
green tick vs green tick
green tick vs green tick
green tick vs -

GPU Memory

Memory4096 MBvs4096 MB
Memory Speed1250 MHzvs750 MHz
Memory Bus256 Bitvs512 Bit
Memory TypeGDDR5vsGDDR5
Memory Bandwidth160GB/secvs192GB/sec
L2 Cache 512 KB green tick vs 0 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%

GPU Display

Shader Processing Units1280vs768
Actual Shader Performance50%vs46%
Texture Mapping Units80vs128
Texture Rate72 GTexel/svs79.4 GTexel/s
Render Output Units32vs64
Pixel Rate28.8 GPixel/svs39.7 GPixel/s

GPU Outputs

Max Digital Resolution (WxH)4096x2160vs2560x1600
VGA Connections0vs0
DVI Connections0vs0
HDMI Connections0vs0
DisplayPort Connections0vs-

GPU Power Requirements

Max Power100 Wattsvs200 Watts
Recommended PSU--

GPU Features

Shader Model5.0vs5.0
Open GL4.4vs4.1
Open CL-vs-
Notebook GPUyesyes

GPU Supporting Hardware

Recommended ProcessorIntel Core i7-4810MQ 4-Core 2.8GHzvsIntel Core i7-3610QM 4-Core 2.3GHz
Recommended RAM8 GBvs8 GB
Maximum Recommended Gaming Resolution1920x1080vs1920x1080

Gaming Performance Value

Performance Value

GPU Mini Review

Mini ReviewOverview
Radeon R9 M390X 4GB is a High-End Mobile Graphics Card based on the Second Generation of the Graphics Core Next Architecture (GCN).

Radeon R9 M390X 4GB Features a GPU Codenamed Neptune XT which is a Second Gen GCN GPU and is identical to the Curacao XT GPU used on the Desktop Radeon R9 270X.
Neptune XT has 20 Compute Units Unlocked and thus offers 1280 Shader Processing Units, 80 TMUs and 32 ROPs.

The Central Unit is Clocked at 900MHz and goes up to 950MHz, in Turbo Mode.

Memory: Speed
The GPU is equipped with fast GDDR5 and Accesses the Frame Buffer through a 256-bit Memory Interface. The Memory Clock Operates at 1250MHz.

Memory: Frame Buffer
The GPU can fill up a Memory Pool of up to 4GB. Under most circumstances, this only proves useful in certain 3D Games whose Settings Require Large Amounts of Memory.
However, because the GPU itself is too weak to work under other circumstances in which 4GB of Memory are needed - such as 4K Gaming, a Large Frame Buffer is mostly a Gimmick.

Power Consumption
With a rated board TDP of 100W, it is suited for very large laptops.

Radeon R9 M390X 4GB is essentially a fast Radeon R9 M290X 4GB.
Performance is Comparable to the desktop Radeon HD 7870.

System Suggestions
Radeon R9 M390X 4GB is best suited for resolutions up to and including 1920x1080. We recommend a Strong Processor and 8GB of RAM for Optimal Performance.
GeForce GTX 675M SLI is a solution of two GeForce GTX 675M put together using NVIDIA'S SLI technology.
Check the page of GeForce GTX 675M to know more about its chip.
As usual, SLI relies a lot on proper driver support and may suffer from micro-stuttering in lower frame rates (below 30). Benchmarks indicate the performance is overall, about 35% better than a single GeForce GTX 675M performing by itself but at times (depending whether or not the 3D game supports SLI or in the graphics driver) it performed worse than a single GeForce GTX 675M.
Even the most demanding games will run at the highest settings.
Recommended CPU
Possible GPU Upgrades
GPU Variants