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Radeon HD 4650 512MB vs Radeon HD 6450 (OEM) 1GB


Intro

The Radeon HD 4650 512MB comes with a core clock frequency of 600 MHz and a DDR2 memory frequency of 500 MHz. It also features a 128-bit memory bus, and uses a 55 nm design. It is comprised of 320(64x5) SPUs, 32 Texture Address Units, and 8 Raster Operation Units.

Compare all that to the Radeon HD 6450 (OEM) 1GB, which comes with core clock speeds of 750 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR5 memory. It features 160 SPUs as well as 8 Texture Address Units and 4 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM) 1GB 31 Watts
Radeon HD 4650 512MB 55 Watts
Difference: 24 Watts (77%)

Memory Bandwidth

Performance-wise, the Radeon HD 6450 (OEM) 1GB should in theory be a lot superior to the Radeon HD 4650 512MB in general. (explain)

Radeon HD 6450 (OEM) 1GB 28800 MB/sec
Radeon HD 4650 512MB 16000 MB/sec
Difference: 12800 (80%)

Texel Rate

The Radeon HD 4650 512MB will be quite a bit (about 220%) better at AF than the Radeon HD 6450 (OEM) 1GB. (explain)

Radeon HD 4650 512MB 19200 Mtexels/sec
Radeon HD 6450 (OEM) 1GB 6000 Mtexels/sec
Difference: 13200 (220%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 4650 512MB is a better choice, by a large margin. (explain)

Radeon HD 4650 512MB 4800 Mpixels/sec
Radeon HD 6450 (OEM) 1GB 3000 Mpixels/sec
Difference: 1800 (60%)

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 6450 (OEM) 1GB

Specifications

Display Specifications

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Model Radeon HD 4650 512MB Radeon HD 6450 (OEM) 1GB
Manufacturer AMD AMD
Year Sep 10, 2008 February 2011
Code Name RV730 PRO Caicos
Memory 512 MB 1024 MB
Core Speed 600 MHz 750 MHz
Memory Speed 1000 MHz 3600 MHz
Power (Max TDP) 55 watts 31 watts
Bandwidth 16000 MB/sec 28800 MB/sec
Texel Rate 19200 Mtexels/sec 6000 Mtexels/sec
Pixel Rate 4800 Mpixels/sec 3000 Mpixels/sec
Unified Shaders 320(64x5) 160
Texture Mapping Units 32 8
Render Output Units 8 4
Bus Type DDR2 GDDR5
Bus Width 128-bit 64-bit
Fab Process 55 nm 40 nm
Transistors 514 million 370 million
Bus PCIe 2.0 x16, AGP 8x PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of MB per second) that can be transported past the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total texture units of the card by the core clock 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 in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few 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 6450 (OEM) 1GB

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