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Radeon HD 4650 512MB vs Radeon HD 7750

Intro

The Radeon HD 4650 512MB uses a 55 nm design. AMD has set the core frequency at 600 MHz. The DDR2 RAM works at a frequency of 500 MHz on this specific card. It features 320(64x5) SPUs as well as 32 TAUs and 8 ROPs.

Compare those specs to the Radeon HD 7750, which features GPU clock speed of 800 MHz, and 1024 MB of GDDR5 RAM set to run at 1125 MHz through a 128-bit bus. It also is made up of 512 Stream Processors, 32 Texture Address Units, and 16 Raster Operation Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Performance-wise, the Radeon HD 7750 should in theory be a lot better 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 will be quite a bit (approximately 33%) better at texture 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 should be much (approximately 167%) more effective at FSAA than the Radeon HD 4650 512MB, and will be able to handle higher screen resolutions without slowing down too much. (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

Amazon.com

Radeon HD 7750

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 7750
Manufacturer AMD AMD
Year Sep 10, 2008 February 2012
Code Name RV730 PRO Cape Verde Pro
Fab Process 55 nm 28 nm
Bus PCIe 2.0 x16, AGP 8x PCIe 3.0 x16
Memory 512 MB 1024 MB
Core Speed 600 MHz 800 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 500 MHz (1000 MHz effective) 1125 MHz (4500 MHz effective)
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
DirectX Version DirectX 10.1 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2
Power (Max TDP) 55 watts 55 watts
Shader Model 4.1 5.0
Bandwidth 16000 MB/sec 72000 MB/sec
Texel Rate 19200 Mtexels/sec 25600 Mtexels/sec
Pixel Rate 4800 Mpixels/sec 12800 Mpixels/sec

Memory Bandwidth: Bandwidth is the largest amount of information (counted in MB per second) that can be transferred over the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, 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 number of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

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