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GeForce 840M vs Radeon HD 5450

Intro

The GeForce 840M comes with a core clock frequency of 1029 MHz and a DDR3 memory speed of 1000 MHz. It also makes use of a 64-bit memory bus, and makes use of a 28 nm design. It is made up of 384 SPUs, 24 Texture Address Units, and 8 Raster Operation Units.

Compare those specifications to the Radeon HD 5450, which makes use of a 40 nm design. AMD has clocked the core frequency at 650 MHz. The DDR3 RAM is set to run at a speed of 800 MHz on this model. It features 80(16x5) SPUs along with 8 Texture Address Units and 4 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450 19 Watts
GeForce 840M 30 Watts
Difference: 11 Watts (58%)

Memory Bandwidth

Theoretically speaking, the GeForce 840M should be 25% quicker than the Radeon HD 5450 in general, due to its greater data rate. (explain)

GeForce 840M 16000 MB/sec
Radeon HD 5450 12800 MB/sec
Difference: 3200 (25%)

Texel Rate

The GeForce 840M will be much (approximately 375%) better at AF than the Radeon HD 5450. (explain)

GeForce 840M 24696 Mtexels/sec
Radeon HD 5450 5200 Mtexels/sec
Difference: 19496 (375%)

Pixel Rate

The GeForce 840M will be quite a bit (more or less 217%) better at full screen anti-aliasing than the Radeon HD 5450, and also will be able to handle higher screen resolutions without slowing down too much. (explain)

GeForce 840M 8232 Mpixels/sec
Radeon HD 5450 2600 Mpixels/sec
Difference: 5632 (217%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

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GeForce 840M

Amazon.com

Check prices at:

Radeon HD 5450

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce 840M Radeon HD 5450
Manufacturer nVidia AMD
Year March 12 2014 February 4, 2010
Code Name GM108 Cedar PRO
Memory 2048 MB 512 MB
Core Speed 1029 MHz 650 MHz
Memory Speed 2000 MHz 1600 MHz
Power (Max TDP) 30 watts 19 watts
Bandwidth 16000 MB/sec 12800 MB/sec
Texel Rate 24696 Mtexels/sec 5200 Mtexels/sec
Pixel Rate 8232 Mpixels/sec 2600 Mpixels/sec
Unified Shaders 384 80(16x5)
Texture Mapping Units 24 8
Render Output Units 8 4
Bus Type DDR3 DDR3
Bus Width 64-bit 64-bit
Fab Process 28 nm 40 nm
Transistors (Unknown) million 292 million
Bus PCIe 3.0 x16 PCIe 2.1 x16
DirectX Version DirectX 12 DirectX 11
OpenGL Version OpenGL 4.5 OpenGL 3.2

Memory Bandwidth: Bandwidth is the largest amount of information (counted in megabytes per second) that can be transported past the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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GeForce 840M

Amazon.com

Check prices at:

Radeon HD 5450

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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