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

Intro

The Radeon HD 4650 512MB features a GPU core speed of 600 MHz, and the 512 MB of DDR2 RAM runs at 500 MHz through a 128-bit bus. It also is comprised of 320(64x5) SPUs, 32 Texture Address Units, and 8 ROPs.

Compare all of that to the Radeon HD 6450 (OEM) 1GB, which comes with a core clock frequency of 750 MHz and a GDDR5 memory speed of 900 MHz. It also uses a 64-bit memory bus, and makes use of a 40 nm design. It features 160 SPUs, 8 Texture Address Units, and 4 Raster Operation Units.

(No game benchmarks for this combination yet.)

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 theoretically be much 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 much (more or less 220%) better at anisotropic 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

If running with lots of anti-aliasing is important to you, then the Radeon HD 4650 512MB is superior to the Radeon HD 6450 (OEM) 1GB, and very much so. (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

Amazon.com

Radeon HD 6450 (OEM) 1GB

Amazon.com

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

Model Radeon HD 4650 512MB Radeon HD 6450 (OEM) 1GB
Manufacturer AMD AMD
Year Sep 10, 2008 February 2011
Code Name RV730 PRO Caicos
Fab Process 55 nm 40 nm
Bus PCIe 2.0 x16, AGP 8x PCIe 2.1 x16
Memory 512 MB 1024 MB
Core Speed 600 MHz 750 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 500 MHz (1000 MHz effective) 900 MHz (3600 MHz effective)
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
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1
Power (Max TDP) 55 watts 31 watts
Shader Model 4.1 5.0
Bandwidth 16000 MB/sec 28800 MB/sec
Texel Rate 19200 Mtexels/sec 6000 Mtexels/sec
Pixel Rate 4800 Mpixels/sec 3000 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This number is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the video 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 most pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant 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.

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