ATI Radeon HD 3870 X2 vs NVIDIA GeForce 840A

ATI Radeon HD 3870 X2
NVIDIA GeForce 840A

General info

Comparison of Radeon HD 3870 X2 and GeForce 840A architecture, market type and release date.
Place in performance rating
Code name
Release date
26 January 2008
17 March 2014
Launch price (MSRP)
no data

Technical specs

Radeon HD 3870 X2 and GeForce 840A's general performance parameters such as number of shaders, GPU core clock, manufacturing process, texturing and calculation speed. These parameters indirectly speak of Radeon HD 3870 X2 and GeForce 840A's performance, but for precise assessment you have to consider its benchmark and gaming test results.
Core clock speed
825 MHz
1029 MHz
Boost Clock
no data
1124 MHz
Transistor count
666 million
no data
Manufacturing process technology
55 nm
28 nm
Power consumption (TDP)
165 Watt
33 Watt
Texture fill rate
Floating-point performance
2x 528.0 gflops
863.2 gflops

Compatibility, dimensions and requirements

Information on Radeon HD 3870 X2 and GeForce 840A compatibility with other computer components. Useful when choosing a future computer configuration or upgrading an existing one. For desktop video cards it's interface and bus (motherboard compatibility), additional power connectors (power supply compatibility).
PCIe 2.0 x16
PCIe 3.0 x8
267 mm
no data
Supplementary power connectors
1x 6-pin + 1x 8-pin
no data


Parameters of memory installed on Radeon HD 3870 X2 and GeForce 840A: its type, size, bus, clock and resulting bandwidth. Note that GPUs integrated into processors don't have dedicated memory and use a shared part of system RAM.
Memory type
Maximum RAM amount
512 MB
2 GB
Memory bus width
256 Bit
64 Bit
Memory clock speed
1802 MHz
2002 MHz
Memory bandwidth
57.66 GB/s
16.02 GB/s

Video outputs and ports

Types and number of video connectors present on Radeon HD 3870 X2 and GeForce 840A.
Display Connectors
2x DVI, 1x S-Video
No outputs

API support

APIs supported by Radeon HD 3870 X2 and GeForce 840A, sometimes including their particular versions.
10.1 (10_1)
12 (11_0)

Benchmark performance

Non-gaming benchmarks performance of Radeon HD 3870 X2 and GeForce 840A. Note that overall benchmark performance is measured in points in 0-100 range.

Overall benchmark performance

ATI HD 3870 X2 0.15
GeForce 840A 0.83 +453.3%


ATI HD 3870 X2 708
GeForce 840A 1136 +60.5%

Gaming performance

Let's see how good Radeon HD 3870 X2 and GeForce 840A are for gaming. Particular gaming benchmark results are measured in FPS.

Advantages of ATI Radeon HD 3870 X2

Wider memory bus (256 vs 64 bit)
Higher memory bandwidth (57.66 vs 16.02 GB/s)

Advantages of NVIDIA GeForce 840A

453.3% faster (about 5.5 times) in synthetic tests
Much newer (17 March 2014 vs 26 January 2008)
More pipelines (384 vs 320)
Finer manufacturing process technology (28 vs 55 nm)
Less power hungry (33 vs 165 watts)

So, HD 3870 X2 or 840A?

Judging by the results of synthetic and gaming tests, Technical City recommends NVIDIA GeForce 840A.
Should you still have questions on choice between Radeon HD 3870 X2 and GeForce 840A, ask them in Comments section, and we shall answer.

Cast your vote

Do you think we are right or mistaken in our choice? Vote by clicking "Like" button near your favourite video card.
ATI Radeon HD 3870 X2
NVIDIA GeForce 840A

User rating

Here you can see the user rating of the video card, as well as rate it yourself.

Advices and comments

Here you can ask a question about Radeon HD 3870 X2 or GeForce 840A, agree or disagree with our judgements, or report an error or mismatch.