GeForce GTX 950 vs Radeon HD 4850 1GB

Intro

Compare all of that to the Radeon HD 4850 1GB, which comes with a core clock frequency of 625 MHz and a GDDR4 memory speed of 993 MHz. It also uses a 256-bit memory bus, and uses a 55 nm design. It is comprised of 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)

GeForce GTX 950		90 Watts
Radeon HD 4850 1GB		110 Watts
	Difference: 20 Watts (22%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 950 should in theory be quite a bit superior to the Radeon HD 4850 1GB overall. (explain)

GeForce GTX 950		105728 MB/sec
Radeon HD 4850 1GB		63552 MB/sec
	Difference: 42176 (66%)

Texel Rate

The GeForce GTX 950 should be much (more or less 97%) better at AF than the Radeon HD 4850 1GB. (explain)

GeForce GTX 950		49152 Mtexels/sec
Radeon HD 4850 1GB		25000 Mtexels/sec
	Difference: 24152 (97%)

Pixel Rate

The GeForce GTX 950 will be much (about 228%) better at full screen anti-aliasing than the Radeon HD 4850 1GB, and also will be capable of handling higher screen resolutions better. (explain)

GeForce GTX 950		32768 Mpixels/sec
Radeon HD 4850 1GB		10000 Mpixels/sec
	Difference: 22768 (228%)

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 information (measured in megabytes per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the interface width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better 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 amount of texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip 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 colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.