GeForce GTX 465 vs Radeon HD 4890 1GB

Intro

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

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4890 1GB		190 Watts
GeForce GTX 465		200 Watts
	Difference: 10 Watts (5%)

Memory Bandwidth

The Radeon HD 4890 1GB, in theory, should perform a lot faster than the GeForce GTX 465 overall. (explain)

Radeon HD 4890 1GB		124800 MB/sec
GeForce GTX 465		102592 MB/sec
	Difference: 22208 (22%)

Texel Rate

The Radeon HD 4890 1GB should be quite a bit (approximately 50%) faster with regards to texture filtering than the GeForce GTX 465. (explain)

Radeon HD 4890 1GB		40000 Mtexels/sec
GeForce GTX 465		26708 Mtexels/sec
	Difference: 13292 (50%)

Pixel Rate

The GeForce GTX 465 is quite a bit (about 21%) more effective at FSAA than the Radeon HD 4890 1GB, and should be able to handle higher resolutions more effectively. (explain)

GeForce GTX 465		19424 Mpixels/sec
Radeon HD 4890 1GB		16000 Mpixels/sec
	Difference: 3424 (21%)

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 information (measured in MB per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the interface width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 again. If 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, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total amount of texture units 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 applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core 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 fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.