Select any two GPUs for comparison
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Gaming Performance Comparison

Recommended System Requirements
Game GeForce GT 645M GeForce 9800M GT SLI
Cyberpunk 2077 707% 742%
Assassins Creed: Valhalla 638% 670%
Call of Duty: Black Ops Cold War 614% 645%
FIFA 21 307% 325%
Microsoft Flight Simulator 614% 645%
World of Warcraft: Shadowlands 1057% 1107%
Watch Dogs Legion 679% 712%
Horizon: Zero Dawn 664% 697%
Grand Theft Auto VI 1036% 1085%
Genshin Impact 707% 742%

In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GT 645M are marginally better than the Nvidia GeForce 9800M GT SLI.

The GeForce GT 645M was released over three years more recently than the 9800M GT, and so the GeForce GT 645M is likely to have far better driver support, meaning it will be much more optimized and ultimately superior to the 9800M GT when running the latest games.

The GeForce GT 645M has 1024 MB more video memory than the 9800M GT, so is likely to be much better at displaying game textures at higher resolutions. However, the overall memory performance is about the same.

The 9800M GT has 73.6 GB/sec greater memory bandwidth than the GeForce GT 645M, which means that the memory performance of the 9800M GT is much better than the GeForce GT 645M.

The GeForce GT 645M has 384 Shader Processing Units and the GeForce 9800M GT SLI has 192. However, the actual shader performance of the GeForce GT 645M is 273 and the actual shader performance of the 9800M GT is 96. The GeForce GT 645M having 177 better shader performance is not particularly notable, as altogether the 9800M GT performs better when taking into account other relevant data.

The GeForce GT 645M transistor size technology is 37 nm (nanometers) smaller than the 9800M GT. This means that the GeForce GT 645M is expected to run much cooler and achieve higher clock frequencies than the 9800M GT. While they exhibit similar graphical performance, the GeForce GT 645M should consume less power than the 9800M GT.

The GeForce GT 645M requires 32 Watts to run and the GeForce 9800M GT SLI requires 130 Watts. The 9800M GT requires 98 Watts more than the GeForce GT 645M to run. The difference is significant enough that the 9800M GT may have an adverse affect on your yearly electricity bills in comparison to the GeForce GT 645M.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed710 MHzvs500 MHz
Boost Clock-vs-
ArchitectureKepler GK107G92 (x2)
OC Potential Fair vs -
Driver Support Good vs -
Release Date01 Oct 2012vs01 Jul 2008
GPU LinkGD LinkGD Link
Approved
Comparison

Resolution Performance

1366x768
6.4
green tick vs -
1600x900
4.9
green tick vs -
1920x1080
3.4
green tick vs -
2560x1440
2.4
green tick vs -
3840x2160
1.5
green tick vs -

GPU Memory

Memory2048 MBvs1024 MB
Memory Speed900 MHzvs800 MHz
Memory Bus128 Bitvs512 Bit
Memory TypeDDR3vsGDDR3
Memory Bandwidth28.8GB/secvs102.4GB/sec
L2 Cache 256 KB green tick vs 0 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%
Comparison

GPU Display

Shader Processing Units384vs192
Actual Shader Performance13%vs5%
Technology28nmvs65nm
Texture Mapping Units32vs-
Texture Rate22.7 GTexel/svs-
Render Output Units16vs-
Pixel Rate11.4 GPixel/svs-
Comparison

GPU Outputs

Max Digital Resolution (WxH)4096x2160vs2560x1600
VGA Connections0vs0
DVI Connections0vs0
HDMI Connections0vs0
DisplayPort Connections-vs-
Comparison

GPU Power Requirements

Max Power32 Wattsvs130 Watts
Recommended PSU--

GPU Features

DirectX12.0vs10
Shader Model5.0vs4.0
Open GL4.5vs2.1
Open CL-vs-
Notebook GPUyesyes
SLI/Crossfirenovsno
Dedicatedyesvsyes
Comparison

GPU Supporting Hardware

Recommended ProcessorIntel Core i5-3210M 2.5GHz-
Recommended RAM4 GB-
Maximum Recommended Gaming Resolution1366x768-

Gaming Performance Value

Performance Value

GPU Mini Review

Mini ReviewOverview
GeForce GT 645M is a Fast-Middle-Class Mobile Graphics Card based on the first revision of the Kepler Architecture.

Architecture
The Kepler Architecture was NVIDIA's big step to power efficiency. Each Stream Multiprocessor (SMX) now hosts 192 Shader Processing Units - against the 48 of older Fermi Architecture, and has been redesigned being now clocked at the same speed of the Central Unit. This means they are more energy efficient and will consequently lead to cooler operating temperatures. However, it also means they are weaker. It can be said that one Fermi SMX is as fast as 2 Kepler SMXs.
Additionally, and not available in all GPUs, Kepler also introduced the Boost Clock Feature. The Boost Clock is an even higher Clock Speed activated when in gaming mode and becomes the effective speed of the GPU.

GPU
It equips a GPU Codenamed GK107 which has 2 Stream Multiprocessors activated and thus offers 384 Shader Processing Units, 32 TMUs and 16 ROPs. The Central Unit is clocked at 710MHz.

Memory
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 900MHz.

Features
DirectX 11.0 Support (11.0 Hardware Default) and support for Optimus, CUDA, OpenCL, DirectCompute, 3D Vision Surround, PhysX, Realtime Raytracing and other technologies

Power Consumption
With a rated board TDP of 32W, it is suited for small laptops.

Performance
Gaming benchmarks indicate its performance stands somewhere between GeForce GT 640M & GeForce GT 650M.

System Suggestions
We recommend a decent processor (Intel Core i5 Mobile) and 4GB of RAM for a system with GeForce GT 645M.
GeForce 9800M GT SLI is a solution of two GeForce 9800M GT put together using NVIDIA'S SLI technology.
Check the page of GeForce 9800M GT 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, up to X% better than a single GeForce 9800M GT 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 9800M GT.
A few demanding games will run at the highest settings with fluent frame rates (30+) but overall most games will require reduced settings to be played optimally.
Recommended CPU
-
Possible GPU Upgrades
N/A
N/A
GPU Variants
-
-