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GeForce 825M vs Radeon HD 4650 512MB

Intro

The GeForce 825M has a GPU core clock speed of 850 MHz, and the 2048 MB of DDR3 memory is set to run at 900 MHz through a 64-bit bus. It also is comprised of 384 Stream Processors, 16 Texture Address Units, and 8 ROPs.

Compare all that to the Radeon HD 4650 512MB, which features clock speeds of 600 MHz on the GPU, and 500 MHz on the 512 MB of DDR2 memory. It features 320(64x5) SPUs along with 32 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 825M 33 Watts
Radeon HD 4650 512MB 55 Watts
Difference: 22 Watts (67%)

Memory Bandwidth

In theory, the Radeon HD 4650 512MB should be a bit faster than the GeForce 825M overall. (explain)

Radeon HD 4650 512MB 16000 MB/sec
GeForce 825M 14400 MB/sec
Difference: 1600 (11%)

Texel Rate

The Radeon HD 4650 512MB should be much (more or less 41%) more effective at anisotropic filtering than the GeForce 825M. (explain)

Radeon HD 4650 512MB 19200 Mtexels/sec
GeForce 825M 13600 Mtexels/sec
Difference: 5600 (41%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce 825M is the winner, by a large margin. (explain)

GeForce 825M 6800 Mpixels/sec
Radeon HD 4650 512MB 4800 Mpixels/sec
Difference: 2000 (42%)

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

Display Prices

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GeForce 825M

Amazon.com

Check prices at:

Radeon HD 4650 512MB

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 825M Radeon HD 4650 512MB
Manufacturer nVidia AMD
Year January 27 2014 Sep 10, 2008
Code Name GK208 RV730 PRO
Memory 2048 MB 512 MB
Core Speed 850 MHz 600 MHz
Memory Speed 1800 MHz 1000 MHz
Power (Max TDP) 33 watts 55 watts
Bandwidth 14400 MB/sec 16000 MB/sec
Texel Rate 13600 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 6800 Mpixels/sec 4800 Mpixels/sec
Unified Shaders 384 320(64x5)
Texture Mapping Units 16 32
Render Output Units 8 8
Bus Type DDR3 DDR2
Bus Width 64-bit 128-bit
Fab Process 28 nm 55 nm
Transistors (Unknown) million 514 million
Bus PCIe 3.0 x8 PCIe 2.0 x16, AGP 8x
DirectX Version DirectX 12 DirectX 10.1
OpenGL Version OpenGL 4.5 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of MB per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

GeForce 825M

Amazon.com

Check prices at:

Radeon HD 4650 512MB

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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