GeForce GTX 650 Ti vs Radeon HD 4890 1GB

Intro

Compare those specs to the Radeon HD 4890 1GB, which comes with core speeds of 1000 MHz on the GPU, and 975 MHz on the 1024 MB of GDDR5 memory. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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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 quite a bit 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 will be much (more or less 48%) better 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 using high levels of AA is important to you, then the Radeon HD 4890 1GB is a better choice, but it probably won't make a huge difference. (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 largest amount of data (in units of MB per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the interface width by the speed of its memory. In the case of DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the video 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 chip could 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 Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.