GeForce GTX 650 Ti vs Radeon HD 4890 1GB

Intro

Compare all of that to the Radeon HD 4890 1GB, which features a core clock speed of 1000 MHz and a GDDR5 memory speed of 975 MHz. It also makes use of a 256-bit bus, and makes use of a 55 nm design. It is comprised of 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 Ti		110 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 80 Watts (73%)

Memory Bandwidth

The Radeon HD 4890 1GB, in theory, should perform a lot faster than the GeForce GTX 650 Ti in general. (explain)

Radeon HD 4890 1GB		124800 MB/sec
GeForce GTX 650 Ti		86400 MB/sec
	Difference: 38400 (44%)

Texel Rate

The GeForce GTX 650 Ti is quite a bit (about 48%) more effective at AF than the Radeon HD 4890 1GB. (explain)

GeForce GTX 650 Ti		59392 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 19392 (48%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 4890 1GB is superior to the GeForce GTX 650 Ti, not by a very large margin though. (explain)

Radeon HD 4890 1GB		16000 Mpixels/sec
GeForce GTX 650 Ti		14848 Mpixels/sec
	Difference: 1152 (8%)

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 maximum amount of data (measured in megabytes per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better 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 are applied per second. This figure is worked out by multiplying the total amount of texture units of the card by the core 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 processed in one second.

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