GeForce GTX 860M vs Radeon HD 4650 512MB

Intro

Compare those specifications to the Radeon HD 4650 512MB, which features a GPU core clock speed of 600 MHz, and 512 MB of DDR2 memory running at 500 MHz through a 128-bit bus. It also features 320(64x5) SPUs, 32 TAUs, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 860M		45 Watts
Radeon HD 4650 512MB		55 Watts
	Difference: 10 Watts (22%)

Memory Bandwidth

In theory, the GeForce GTX 860M will be 300% faster than the Radeon HD 4650 512MB in general, because of its higher data rate. (explain)

GeForce GTX 860M		64000 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 48000 (300%)

Texel Rate

The GeForce GTX 860M will be quite a bit (approximately 299%) faster with regards to AF than the Radeon HD 4650 512MB. (explain)

GeForce GTX 860M		76512 Mtexels/sec
Radeon HD 4650 512MB		19200 Mtexels/sec
	Difference: 57312 (299%)

Pixel Rate

The GeForce GTX 860M should be quite a bit (approximately 166%) better at AA than the Radeon HD 4650 512MB, and will be able to handle higher resolutions without losing too much performance. (explain)

GeForce GTX 860M		12752 Mpixels/sec
Radeon HD 4650 512MB		4800 Mpixels/sec
	Difference: 7952 (166%)

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: Bandwidth is the max amount of data (measured in MB per second) that can be transferred past the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the graphics 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 amount of pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.