GeForce GTX 965M vs Radeon HD 4770

Intro

Compare all that to the Radeon HD 4770, which makes use of a 40 nm design. AMD has set the core speed at 750 MHz. The GDDR5 memory is set to run at a frequency of 800 MHz on this specific model. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 965M		60 Watts
Radeon HD 4770		80 Watts
	Difference: 20 Watts (33%)

Memory Bandwidth

The GeForce GTX 965M should theoretically be quite a bit faster than the Radeon HD 4770 overall. (explain)

GeForce GTX 965M		64000 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 12800 (25%)

Texel Rate

The GeForce GTX 965M will be quite a bit (about 152%) faster with regards to texture filtering than the Radeon HD 4770. (explain)

GeForce GTX 965M		60416 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 36416 (152%)

Pixel Rate

The GeForce GTX 965M should be a lot (approximately 152%) more effective at anti-aliasing than the Radeon HD 4770, and should be able to handle higher screen resolutions without losing too much performance. (explain)

GeForce GTX 965M		30208 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 18208 (152%)

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 largest amount of data (in units of megabytes per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the core speed of the card. 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 rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.