GeForce GTX 750 vs Radeon HD 4870 512MB

Intro

Compare that to the Radeon HD 4870 512MB, which uses a 55 nm design. AMD has set the core frequency at 750 MHz. The GDDR5 RAM runs at a speed of 900 MHz on this particular card. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 750		55 Watts
Radeon HD 4870 512MB		150 Watts
	Difference: 95 Watts (173%)

Memory Bandwidth

The Radeon HD 4870 512MB should theoretically perform quite a bit faster than the GeForce GTX 750 overall. (explain)

Radeon HD 4870 512MB		115200 MB/sec
GeForce GTX 750		80000 MB/sec
	Difference: 35200 (44%)

Texel Rate

The GeForce GTX 750 should be just a bit (approximately 9%) better at anisotropic filtering than the Radeon HD 4870 512MB. (explain)

GeForce GTX 750		32640 Mtexels/sec
Radeon HD 4870 512MB		30000 Mtexels/sec
	Difference: 2640 (9%)

Pixel Rate

The GeForce GTX 750 is quite a bit (about 36%) better at full screen anti-aliasing than the Radeon HD 4870 512MB, and should be able to handle higher screen resolutions without slowing down too much. (explain)

GeForce GTX 750		16320 Mpixels/sec
Radeon HD 4870 512MB		12000 Mpixels/sec
	Difference: 4320 (36%)

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 over the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.