GeForce GTX 650 Ti 2GB vs Radeon HD 4770

Intro

Compare all that to the Radeon HD 4770, which uses a 40 nm design. AMD has set the core frequency at 750 MHz. The GDDR5 RAM runs at a frequency of 800 MHz on this particular model. It features 640(128x5) SPUs as well as 32 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
GeForce GTX 650 Ti 2GB		110 Watts
	Difference: 30 Watts (38%)

Memory Bandwidth

The GeForce GTX 650 Ti 2GB, in theory, should be a lot faster than the Radeon HD 4770 overall. (explain)

GeForce GTX 650 Ti 2GB		86400 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 35200 (69%)

Texel Rate

The GeForce GTX 650 Ti 2GB is much (about 147%) better at AF than the Radeon HD 4770. (explain)

GeForce GTX 650 Ti 2GB		59392 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 35392 (147%)

Pixel Rate

The GeForce GTX 650 Ti 2GB is quite a bit (approximately 24%) faster with regards to anti-aliasing than the Radeon HD 4770, and also will be able to handle higher resolutions better. (explain)

GeForce GTX 650 Ti 2GB		14848 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 2848 (24%)

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 maximum amount of data (counted in MB per second) that can be transferred over the external memory interface in one second. It is worked out by multiplying the bus width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many 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.