GeForce 840M vs Iris Plus Graphics 645
If you are going to buy a new graphics card and are choosing between GeForce 840M and Iris Plus Graphics 645, 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 GeForce 840M stacks up against Iris Plus Graphics 645, check out specs charts below.
GeForce 840M and Iris Plus Graphics 645 are Laptop Graphics Cards
Note: GeForce 840M and Iris Plus Graphics 645 are only used in laptop graphics. They have 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 GeForce 840M or Iris Plus Graphics 645 here:
Main Specs
GeForce 840M
Iris Plus Graphics 645
Power consumption (TDP)
33 Watt
15 Watt
Interface
PCIe 3.0 x8
PCIe 3.0 x1
Memory type
DDR3
DDR3/DDR4
Maximum RAM amount
4 GB
Display Connectors
No outputs
No outputs
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GeForce 840M has 120% more power consumption, than Iris Plus Graphics 645.
GeForce 840M is connected by PCIe 3.0 x8, and Iris Plus Graphics 645 uses PCIe 3.0 x1 interface.
Both cards are used in Laptops.
GeForce 840M is build with Maxwell architecture, and Iris Plus Graphics 645 - with Gen. 9.5 Coffee Lake.
Core clock speed of GeForce 840M is 729 MHz higher, than Iris Plus Graphics 645.
GeForce 840M is manufactured by 28 nm process technology, and Iris Plus Graphics 645 - by 14 nm process technology.
Game benchmarks
Assassin's Creed Odyssey
Battlefield 5
Call of Duty: Warzone
Counter-Strike: Global Offensive
Cyberpunk 2077
Dota 2
Far Cry 5
Fortnite
Forza Horizon 4
Grand Theft Auto V
Metro Exodus
Minecraft
PLAYERUNKNOWN'S BATTLEGROUNDS
Red Dead Redemption 2
The Witcher 3: Wild Hunt
World of Tanks
high / 1080p
1−2
4−5
ultra / 1080p
0−1
2−3
QHD / 1440p
0−1
0−1
low / 720p
12−14
12−14
medium / 1080p
3−4
5−6
The average gaming FPS of Iris Plus Graphics 645 in Assassin's Creed Odyssey is 16% more, than GeForce 840M.
ultra / 1080p
4−5
7−8
QHD / 1440p
0−1
0−1
low / 720p
16−18
16−18
medium / 1080p
5−6
8−9
The average gaming FPS of Iris Plus Graphics 645 in Battlefield 5 is 22% more, than GeForce 840M.
low / 768p
45−50
45−50
high / 1080p
40−45
45−50
QHD / 1440p
0−1
0−1
The average gaming FPS of Iris Plus Graphics 645 in Call of Duty: Warzone is 4% more, than GeForce 840M.
low / 768p
120−130
100−110
medium / 768p
90−95
80−85
ultra / 1080p
40−45
35−40
QHD / 1440p
24−27
24−27
4K / 2160p
18−20
−
high / 768p
65−70
60−65
The average gaming FPS of GeForce 840M in Counter-Strike: Global Offensive is 12% more, than Iris Plus Graphics 645.
low / 768p
85−90
55−60
ultra / 1080p
16−18
12−14
medium / 1080p
40−45
45−50
The average gaming FPS of GeForce 840M in Cyberpunk 2077 is 25% more, than Iris Plus Graphics 645.
low / 768p
75−80
65−70
medium / 768p
50−55
45−50
ultra / 1080p
24−27
21−24
The average gaming FPS of GeForce 840M in Dota 2 is 13% more, than Iris Plus Graphics 645.
high / 1080p
2−3
5−6
ultra / 1080p
2−3
5−6
4K / 2160p
0−1
3−4
low / 720p
12−14
12−14
medium / 1080p
3−4
5−6
The average gaming FPS of Iris Plus Graphics 645 in Far Cry 5 is 40% more, than GeForce 840M.
high / 1080p
10−11
12−14
ultra / 1080p
5−6
8−9
QHD / 1440p
2−3
−
low / 720p
50−55
45−50
medium / 1080p
10−12
12−14
The average gaming FPS of Iris Plus Graphics 645 in Fortnite is 5% more, than GeForce 840M.
high / 1080p
4−5
8−9
QHD / 1440p
0−1
0−1
low / 720p
16−18
16−18
medium / 1080p
7−8
9−10
The average gaming FPS of Iris Plus Graphics 645 in Forza Horizon 4 is 22% more, than GeForce 840M.
low / 768p
45−50
40−45
medium / 768p
−
35−40
high / 1080p
5−6
7−8
ultra / 1080p
2−3
5−6
QHD / 1440p
0−1
0−1
medium / 720p
35−40
−
GeForce 840M and Iris Plus Graphics 645 have the same average FPS in Grand Theft Auto V.
high / 1080p
1−2
3−4
ultra / 1080p
0−1
2−3
4K / 2160p
0−1
0−1
low / 720p
5−6
7−8
medium / 1080p
3−4
4−5
The average gaming FPS of Iris Plus Graphics 645 in Metro Exodus is 66% more, than GeForce 840M.
low / 768p
90−95
85−90
high / 1080p
85−90
80−85
ultra / 1080p
70−75
70−75
medium / 1080p
90−95
−
The average gaming FPS of GeForce 840M in Minecraft is 5% more, than Iris Plus Graphics 645.
high / 1080p
−
16−18
ultra / 1080p
12−14
14−16
low / 720p
27−30
24−27
medium / 1080p
14−16
16−18
The average gaming FPS of Iris Plus Graphics 645 in PLAYERUNKNOWN'S BATTLEGROUNDS is 5% more, than GeForce 840M.
ultra / 1080p
4−5
7−8
QHD / 1440p
0−1
0−1
low / 720p
6−7
7−8
The average gaming FPS of Iris Plus Graphics 645 in Red Dead Redemption 2 is 40% more, than GeForce 840M.
low / 768p
12−14
16−18
medium / 768p
9−10
12−14
high / 1080p
4−5
6−7
ultra / 1080p
3−4
5−6
4K / 2160p
0−1
−
The average gaming FPS of Iris Plus Graphics 645 in The Witcher 3: Wild Hunt is 42% more, than GeForce 840M.
low / 768p
75−80
80−85
medium / 768p
35−40
35−40
ultra / 1080p
16−18
14−16
high / 768p
30−35
30−33
GeForce 840M and Iris Plus Graphics 645 have the same average FPS in World of Tanks.
Full Specs
GeForce 840M
Iris Plus Graphics 645
Architecture
Maxwell
Gen. 9.5 Coffee Lake
Code name
N15S-GT
Kaby Lake GT3e
Type
Laptop
Laptop
Release date
12 March 2014
10 July 2019
Pipelines
384
48
Core clock speed
1029 MHz
300 MHz
Boost Clock
1124 MHz
1150 MHz
Manufacturing process technology
28 nm
14 nm
Texture fill rate
17.98
50.40
Floating-point performance
863.2 gflops
Memory bus width
64 Bit
Memory clock speed
2000 MHz
Memory bandwidth
16.02 GB/s
Shared memory
-
+
DirectX
12 (11_0)
12 (12_1)
Shader Model
5.1
6.4
OpenGL
4.5
4.6
OpenCL
1.2
2.1
Vulkan
1.1.126
1.1.103
CUDA
+
Bus support
PCI Express 2.0, PCI Express 3.0
Bitcoin / BTC (SHA256)
92 Mh/s
Laptop size
medium sized
Optimus
+
Quick Sync
+
GPU Boost
2.0
GameWorks
+
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