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


The Radeon HD 4650 512MB makes use of a 55 nm design. AMD has clocked the core frequency at 600 MHz. The DDR2 RAM works at a speed of 500 MHz on this specific model. It features 320(64x5) SPUs as well as 32 Texture Address Units and 8 Rasterization Operator Units.

Compare those specifications to the Radeon HD 6450 (OEM) 1GB, which features a core clock speed of 750 MHz and a GDDR5 memory frequency of 900 MHz. It also uses a 64-bit bus, and makes use of a 40 nm design. It is comprised of 160 SPUs, 8 TAUs, and 4 ROPs.

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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

The Radeon HD 6450 (OEM) 1GB, in theory, should perform a lot faster than the Radeon HD 4650 512MB overall. (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 much (about 220%) faster with regards to texture filtering 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

The Radeon HD 4650 512MB is a lot (about 60%) more effective at FSAA than the Radeon HD 6450 (OEM) 1GB, and also should be capable of handling higher resolutions without slowing down too much. (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

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Radeon HD 4650 512MB

Radeon HD 6450 (OEM) 1GB

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.


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: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be transported over the external memory interface in one second. It is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 processed per second. This number is worked out by multiplying the total amount of texture units of the card by the core clock 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 amount of pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.


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