GeForce GT 640 vs Radeon HD 6990

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Aggregate performance score

We've compared Radeon HD 6990 and GeForce GT 640, covering specs and all relevant benchmarks.

HD 6990
2011
2 GB GDDR5, 375 Watt
7.82
+156%

HD 6990 outperforms GT 640 by a whopping 156% based on our aggregate benchmark results.

Primary details

GPU architecture, market segment, value for money and other general parameters compared.

Place in the ranking522769
Place by popularitynot in top-100not in top-100
Cost-effectiveness evaluation0.630.20
Power efficiency1.433.23
ArchitectureTeraScale 3 (2010−2013)Kepler (2012−2018)
GPU code nameAntillesGK107
Market segmentDesktopDesktop
Release date8 March 2011 (13 years ago)5 June 2012 (12 years ago)
Launch price (MSRP)$699 $99

Cost-effectiveness evaluation

Performance to price ratio. The higher, the better.

HD 6990 has 215% better value for money than GT 640.

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 cores1536384
Core clock speed830 MHz902 MHz
Number of transistors2,640 million1,270 million
Manufacturing process technology40 nm28 nm
Power consumption (TDP)375 Watt65 Watt
Texture fill rate79.6828.86
Floating-point processing power2.55 TFLOPS0.6927 TFLOPS
ROPs3216
TMUs9632

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).

InterfacePCIe 2.0 x16PCIe 3.0 x16
Length295 mm145 mm
Width2-slot1-slot
Supplementary power connectors2x 8-pinNone

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 typeGDDR5DDR3
Maximum RAM amount2 GB2 GB
Memory bus width256 Bit128 Bit
Memory clock speed1250 MHz891 MHz
Memory bandwidth160.0 GB/s28.51 GB/s

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 Connectors1x DVI, 4x mini-DisplayPort1x DVI, 1x HDMI, 1x DisplayPort
HDMI-+

API compatibility

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

DirectX11.2 (11_0)12 (11_0)
Shader Model5.05.1
OpenGL4.44.6
OpenCL1.21.2
VulkanN/A1.1.126
CUDA-3.0

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.

HD 6990 7.82
+156%
GT 640 3.06

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.

HD 6990 3013
+156%
GT 640 1178

3DMark Fire Strike Graphics

Fire Strike is a DirectX 11 benchmark for gaming PCs. It features two separate tests displaying a fight between a humanoid and a fiery creature made of lava. Using 1920x1080 resolution, Fire Strike shows off some realistic graphics and is quite taxing on hardware.

HD 6990 5830
+274%
GT 640 1560

Gaming performance

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

Pros & cons summary


Performance score 7.82 3.06
Recency 8 March 2011 5 June 2012
Chip lithography 40 nm 28 nm
Power consumption (TDP) 375 Watt 65 Watt

HD 6990 has a 155.6% higher aggregate performance score.

GT 640, on the other hand, has an age advantage of 1 year, a 42.9% more advanced lithography process, and 476.9% lower power consumption.

The Radeon HD 6990 is our recommended choice as it beats the GeForce GT 640 in performance tests.


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

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Do you think we are right or mistaken in our choice? Vote by clicking "Like" button near your favorite graphics card.


AMD Radeon HD 6990
Radeon HD 6990
NVIDIA GeForce GT 640
GeForce GT 640

Comparisons with similar GPUs

We selected several comparisons of graphics cards with performance close to those reviewed, providing you with more options to consider.

Community ratings

Here you can see the user ratings of the compared graphics cards, as well as rate them yourself.


3.6 25 votes

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3.4 1576 votes

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Questions & comments

Here you can ask a question about this comparison, agree or disagree with our judgements, or report an error or mismatch.