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Radeon HD 4650 512MB vs Radeon HD 7750

Intro

The Radeon HD 4650 512MB makes use of a 55 nm design. AMD has clocked the core frequency at 600 MHz. The DDR2 memory is set to run at a speed of 500 MHz on this card. It features 320(64x5) SPUs as well as 32 Texture Address Units and 8 ROPs.

Compare those specifications to the Radeon HD 7750, which features core speeds of 800 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 memory. It features 512 SPUs as well as 32 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

The Radeon HD 7750 should in theory perform a lot faster than the Radeon HD 4650 512MB overall. (explain)

Radeon HD 7750 72000 MB/sec
Radeon HD 4650 512MB 16000 MB/sec
Difference: 56000 (350%)

Texel Rate

The Radeon HD 7750 is a lot (approximately 33%) faster with regards to anisotropic filtering than the Radeon HD 4650 512MB. (explain)

Radeon HD 7750 25600 Mtexels/sec
Radeon HD 4650 512MB 19200 Mtexels/sec
Difference: 6400 (33%)

Pixel Rate

The Radeon HD 7750 is much (more or less 167%) better at AA than the Radeon HD 4650 512MB, and capable of handling higher resolutions better. (explain)

Radeon HD 7750 12800 Mpixels/sec
Radeon HD 4650 512MB 4800 Mpixels/sec
Difference: 8000 (167%)

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

Radeon HD 4650 512MB

Radeon HD 7750

Specifications

Display Specifications

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Model Radeon HD 4650 512MB Radeon HD 7750
Manufacturer AMD AMD
Year Sep 10, 2008 February 2012
Code Name RV730 PRO Cape Verde Pro
Memory 512 MB 1024 MB
Core Speed 600 MHz 800 MHz
Memory Speed 1000 MHz 4500 MHz
Power (Max TDP) 55 watts 55 watts
Bandwidth 16000 MB/sec 72000 MB/sec
Texel Rate 19200 Mtexels/sec 25600 Mtexels/sec
Pixel Rate 4800 Mpixels/sec 12800 Mpixels/sec
Unified Shaders 320(64x5) 512
Texture Mapping Units 32 32
Render Output Units 8 16
Bus Type DDR2 GDDR5
Bus Width 128-bit 128-bit
Fab Process 55 nm 28 nm
Transistors 514 million 1500 million
Bus PCIe 2.0 x16, AGP 8x PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the maximum amount of data (in units of MB per second) that can be transported across the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. 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 number of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour 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 is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Radeon HD 4650 512MB

Radeon HD 7750

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