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Radeon HD 4650 1GB vs Radeon HD 7750

Intro

The Radeon HD 4650 1GB has a clock frequency of 600 MHz and a GDDR3 memory frequency of 700 MHz. It also features a 128-bit memory bus, and uses a 55 nm design. It is made up of 320(64x5) SPUs, 32 TAUs, and 8 ROPs.

Compare those specs to the Radeon HD 7750, which features GPU core speed of 800 MHz, and 1024 MB of GDDR5 memory running at 1125 MHz through a 128-bit bus. It also is comprised of 512 SPUs, 32 TAUs, 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 theoretically be much better than the Radeon HD 4650 1GB overall. (explain)

Radeon HD 7750 72000 MB/sec
Radeon HD 4650 1GB 22400 MB/sec
Difference: 49600 (221%)

Texel Rate

The Radeon HD 7750 should be quite a bit (approximately 33%) more effective at AF than the Radeon HD 4650 1GB. (explain)

Radeon HD 7750 25600 Mtexels/sec
Radeon HD 4650 1GB 19200 Mtexels/sec
Difference: 6400 (33%)

Pixel Rate

The Radeon HD 7750 should be quite a bit (more or less 167%) more effective at AA than the Radeon HD 4650 1GB, and also will be capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 7750 12800 Mpixels/sec
Radeon HD 4650 1GB 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 1GB

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 1GB 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 1024 MB 1024 MB
Core Speed 600 MHz 800 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 700 MHz (1400 MHz effective) 1125 MHz (4500 MHz effective)
Unified Shaders 320(64x5) 512
Texture Mapping Units 32 32
Render Output Units 8 16
Bus Type GDDR3 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 22400 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 megabytes per second) that can be transferred over the external memory interface in a second. It is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better 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 amount of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip 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 card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

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