Radeon HD 4650 512MB vs Radeon R7 240

Intro

Compare all that to the Radeon R7 240, which has GPU clock speed of 730 MHz, and 2048 MB of DDR3 memory set to run at 900 MHz through a 128-bit bus. It also features 320 Stream Processors, 20 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 240		30 Watts
Radeon HD 4650 512MB		55 Watts
	Difference: 25 Watts (83%)

Memory Bandwidth

Performance-wise, the Radeon R7 240 should in theory be a lot superior to the Radeon HD 4650 512MB in general. (explain)

Radeon R7 240		28800 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 12800 (80%)

Texel Rate

The Radeon HD 4650 512MB will be much (about 32%) faster with regards to anisotropic filtering than the Radeon R7 240. (explain)

Radeon HD 4650 512MB		19200 Mtexels/sec
Radeon R7 240		14600 Mtexels/sec
	Difference: 4600 (32%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon R7 240 is a better choice, by a large margin. (explain)

Radeon R7 240		5840 Mpixels/sec
Radeon HD 4650 512MB		4800 Mpixels/sec
	Difference: 1040 (22%)

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

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of megabytes per second) that can be transferred across the external memory interface in a second. The number is worked out by multiplying the interface width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 again. If it uses 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, HDR and higher screen 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 by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the card's clock speed. 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 fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.