GeForce 7900 GTX vs 840M

Place in the ranking	795	1105
Place by popularity	not in top-100	not in top-100
Power efficiency	5.88	0.82
Architecture	Maxwell (2014−2017)	Curie (2003−2013)
GPU code name	GM108	G71
Market segment	Laptop	Desktop
Release date	12 March 2014 (10 years ago)	9 March 2006 (18 years ago)

Detailed specifications

General parameters such as number of shaders, GPU core base clock and boost clock speeds, manufacturing process, texturing and calculation speed. Note that power consumption of some graphics cards can well exceed their nominal TDP, especially when overclocked.

Pipelines / CUDA cores	384	no data
Core clock speed	1029 MHz	650 MHz
Boost clock speed	1124 MHz	no data
Number of transistors	no data	278 million
Manufacturing process technology	28 nm	90 nm
Power consumption (TDP)	33 Watt	84 Watt
Texture fill rate	17.98	15.60
Floating-point processing power	0.8632 TFLOPS	no data
ROPs	8	16
TMUs	16	24

Form factor & compatibility

Information on compatibility with other computer components. Useful when choosing a future computer configuration or upgrading an existing one. For desktop graphics cards it's interface and bus (motherboard compatibility), additional power connectors (power supply compatibility).

Laptop size	medium sized	no data
Bus support	PCI Express 2.0, PCI Express 3.0	no data
Interface	PCIe 3.0 x8	PCIe 1.0 x16
Width	no data	1-slot
Supplementary power connectors	no data	1x 6-pin

VRAM capacity and type

Parameters of VRAM installed: its type, size, bus, clock and resulting bandwidth. Integrated GPUs have no dedicated video RAM and use a shared part of system RAM.

Memory type	DDR3	GDDR3
Maximum RAM amount	4 GB	512 MB
Memory bus width	64 Bit	256 Bit
Memory clock speed	1001 MHz	800 MHz
Memory bandwidth	16.02 GB/s	51.2 GB/s
Shared memory	-	-

Connectivity and outputs

Types and number of video connectors present on the reviewed GPUs. As a rule, data in this section is precise only for desktop reference ones (so-called Founders Edition for NVIDIA chips). OEM manufacturers may change the number and type of output ports, while for notebook cards availability of certain video outputs ports depends on the laptop model rather than on the card itself.

Display Connectors

No outputs

2x DVI, 1x S-Video

Supported technologies

Supported technological solutions. This information will prove useful if you need some particular technology for your purposes.

GPU Boost	2.0	no data
Optimus	+	-
GameWorks	+	-

API compatibility

List of supported 3D and general-purpose computing APIs, including their specific versions.

DirectX	12 (11_0)	9.0c (9_3)
Shader Model	5.1	3.0
OpenGL	4.5	2.1
OpenCL	1.2	N/A
Vulkan	1.1.126	N/A
CUDA	+	-

Synthetic benchmark performance

Non-gaming benchmark results comparison. The combined score is measured on a 0-100 point scale.

Combined synthetic benchmark score

This is our combined benchmark score. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.

GeForce 840M 2.83
+183%

7900 GTX 1.00

Passmark

This is the most ubiquitous GPU benchmark. It gives the graphics card a thorough evaluation under various types of load, providing four separate benchmarks for Direct3D versions 9, 10, 11 and 12 (the last being done in 4K resolution if possible), and few more tests engaging DirectCompute capabilities.

GeForce 840M 1092
+182%

7900 GTX 387

Gaming performance

Let's see how good the compared graphics cards are for gaming. Particular gaming benchmark results are measured in FPS.

Average FPS across all PC games

Here are the average frames per second in a large set of popular games across different resolutions:

900p	45 +221%	14−16 −221%
Full HD	17 +183%	6−7 −183%

FPS performance in popular games

Full HD
Low Preset

Cyberpunk 2077

5−6
+400%

1−2

−400%

Full HD
Medium Preset

Assassin's Creed Odyssey	9−10 +200%	3−4 −200%
Assassin's Creed Valhalla	1−2	0−1
Battlefield 5	4−5 +300%	1−2 −300%
Call of Duty: Modern Warfare	7−8 +250%	2−3 −250%
Cyberpunk 2077	5−6 +400%	1−2 −400%
Far Cry 5	5−6 +400%	1−2 −400%
Far Cry New Dawn	8−9 +300%	2−3 −300%
Forza Horizon 4	14−16 +200%	5−6 −200%
Hitman 3	8−9 +300%	2−3 −300%
Horizon Zero Dawn	21−24 +214%	7−8 −214%
Metro Exodus	3−4 +200%	1−2 −200%
Red Dead Redemption 2	7−8 +250%	2−3 −250%
Shadow of the Tomb Raider	12−14 +200%	4−5 −200%
Watch Dogs: Legion	35−40 +217%	12−14 −217%

Full HD
High Preset

Assassin's Creed Odyssey	9−10 +200%	3−4 −200%
Assassin's Creed Valhalla	1−2	0−1
Battlefield 5	4−5 +300%	1−2 −300%
Call of Duty: Modern Warfare	7−8 +250%	2−3 −250%
Cyberpunk 2077	5−6 +400%	1−2 −400%
Far Cry 5	5−6 +400%	1−2 −400%
Far Cry New Dawn	8−9 +300%	2−3 −300%
Forza Horizon 4	14−16 +200%	5−6 −200%
Hitman 3	8−9 +300%	2−3 −300%
Horizon Zero Dawn	21−24 +214%	7−8 −214%
Metro Exodus	3−4 +200%	1−2 −200%
Red Dead Redemption 2	7−8 +250%	2−3 −250%
Shadow of the Tomb Raider	12−14 +200%	4−5 −200%
The Witcher 3: Wild Hunt	23 +188%	8−9 −188%
Watch Dogs: Legion	35−40 +217%	12−14 −217%

Full HD
Ultra Preset

Assassin's Creed Odyssey	9−10 +200%	3−4 −200%
Assassin's Creed Valhalla	1−2	0−1
Call of Duty: Modern Warfare	7−8 +250%	2−3 −250%
Cyberpunk 2077	5−6 +400%	1−2 −400%
Far Cry 5	5−6 +400%	1−2 −400%
Forza Horizon 4	14−16 +200%	5−6 −200%
Hitman 3	8−9 +300%	2−3 −300%
Horizon Zero Dawn	21−24 +214%	7−8 −214%
Shadow of the Tomb Raider	12−14 +200%	4−5 −200%
The Witcher 3: Wild Hunt	6 +200%	2−3 −200%
Watch Dogs: Legion	35−40 +217%	12−14 −217%

Full HD
Epic Preset

Red Dead Redemption 2

7−8
+250%

2−3

−250%

1440p
High Preset

Battlefield 5	5−6 +400%	1−2 −400%
Far Cry New Dawn	4−5 +300%	1−2 −300%

1440p
Ultra Preset

Assassin's Creed Odyssey	2−3	0−1
Call of Duty: Modern Warfare	2−3	0−1
Cyberpunk 2077	1−2	0−1
Far Cry 5	3−4 +200%	1−2 −200%
Hitman 3	8−9 +300%	2−3 −300%
Horizon Zero Dawn	7−8 +250%	2−3 −250%
The Witcher 3: Wild Hunt	2−3	0−1
Watch Dogs: Legion	16−18 +183%	6−7 −183%

1440p
Epic Preset

Red Dead Redemption 2

6−7
+200%

2−3

−200%

4K
High Preset

Battlefield 5	1−2	0−1
Far Cry New Dawn	2−3	0−1

4K
Ultra Preset

Assassin's Creed Odyssey	2−3	0−1
Assassin's Creed Valhalla	1−2	0−1
Call of Duty: Modern Warfare	1−2	0−1
Far Cry 5	1−2	0−1
Forza Horizon 4	0−1	0−1
Watch Dogs: Legion	1−2	0−1

4K
Epic Preset

Red Dead Redemption 2

4−5
+300%

1−2

−300%

This is how GeForce 840M and 7900 GTX compete in popular games:

GeForce 840M is 221% faster in 900p
GeForce 840M is 183% faster in 1080p

Pros & cons summary

Performance score	2.83	1.00
Recency	12 March 2014	9 March 2006
Maximum RAM amount	4 GB	512 MB
Chip lithography	28 nm	90 nm
Power consumption (TDP)	33 Watt	84 Watt

GeForce 840M has a 183% higher aggregate performance score, an age advantage of 8 years, a 700% higher maximum VRAM amount, a 221.4% more advanced lithography process, and 154.5% lower power consumption.

The GeForce 840M is our recommended choice as it beats the GeForce 7900 GTX in performance tests.

Be aware that GeForce 840M is a notebook card while GeForce 7900 GTX is a desktop one.

Should you still have questions concerning choice between the reviewed GPUs, ask them in Comments section, and we shall answer.