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Radeon HD 4650 1GB vs Radeon R5 M255

Intro

The Radeon HD 4650 1GB features a core clock speed of 600 MHz and a GDDR3 memory speed of 700 MHz. It also makes use of a 128-bit bus, and uses a 55 nm design. It features 320(64x5) SPUs, 32 Texture Address Units, and 8 Raster Operation Units.

Compare those specs to the Radeon R5 M255, which has a GPU core clock speed of 940 MHz, and 2048 MB of DDR3 RAM set to run at 1000 MHz through a 64-bit bus. It also is comprised of 320 SPUs, 20 TAUs, and 8 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 4650 1GB should be 40% faster than the Radeon R5 M255 overall, due to its higher data rate. (explain)

Radeon HD 4650 1GB 22400 MB/sec
Radeon R5 M255 16000 MB/sec
Difference: 6400 (40%)

Texel Rate

The Radeon HD 4650 1GB should be a little bit (more or less 2%) faster with regards to AF than the Radeon R5 M255. (explain)

Radeon HD 4650 1GB 19200 Mtexels/sec
Radeon R5 M255 18800 Mtexels/sec
Difference: 400 (2%)

Pixel Rate

The Radeon R5 M255 should be much (more or less 57%) faster with regards to FSAA than the Radeon HD 4650 1GB, and also capable of handling higher resolutions without slowing down too much. (explain)

Radeon R5 M255 7520 Mpixels/sec
Radeon HD 4650 1GB 4800 Mpixels/sec
Difference: 2720 (57%)

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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Radeon HD 4650 1GB

Amazon.com

Check prices at:

Radeon R5 M255

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 Radeon HD 4650 1GB Radeon R5 M255
Manufacturer AMD AMD
Year Sep 10, 2008 June 2014
Code Name RV730 PRO Jet Pro
Memory 1024 MB 2048 MB
Core Speed 600 MHz 940 MHz
Memory Speed 1400 MHz 2000 MHz
Power (Max TDP) 55 watts (Unknown) watts
Bandwidth 22400 MB/sec 16000 MB/sec
Texel Rate 19200 Mtexels/sec 18800 Mtexels/sec
Pixel Rate 4800 Mpixels/sec 7520 Mpixels/sec
Unified Shaders 320(64x5) 320
Texture Mapping Units 32 20
Render Output Units 8 8
Bus Type GDDR3 DDR3
Bus Width 128-bit 64-bit
Fab Process 55 nm 28 nm
Transistors 514 million (Unknown) million
Bus PCIe 2.0 x16, AGP 8x PCIe 3.0 x8
DirectX Version DirectX 10.1 DirectX 11.2
OpenGL Version OpenGL 3.0 OpenGL 4.3

Memory Bandwidth: Bandwidth is the max amount of data (measured in megabytes per second) that can be moved past the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 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 anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 4650 1GB

Amazon.com

Check prices at:

Radeon R5 M255

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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