Geforce GTX 670 vs Radeon HD 4850 512MB

Intro

Compare those specifications to the Radeon HD 4850 512MB, which features GPU core speed of 625 MHz, and 512 MB of GDDR3 memory running at 993 MHz through a 256-bit bus. It also is comprised of 800(160x5) Stream Processors, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 512MB		110 Watts
Geforce GTX 670		170 Watts
	Difference: 60 Watts (55%)

Memory Bandwidth

The Geforce GTX 670, in theory, should be a lot faster than the Radeon HD 4850 512MB overall. (explain)

Geforce GTX 670		192000 MB/sec
Radeon HD 4850 512MB		63552 MB/sec
	Difference: 128448 (202%)

Texel Rate

The Geforce GTX 670 should be a lot (approximately 310%) more effective at AF than the Radeon HD 4850 512MB. (explain)

Geforce GTX 670		102480 Mtexels/sec
Radeon HD 4850 512MB		25000 Mtexels/sec
	Difference: 77480 (310%)

Pixel Rate

The Geforce GTX 670 should be a lot (approximately 193%) more effective at full screen anti-aliasing than the Radeon HD 4850 512MB, and able to handle higher screen resolutions more effectively. (explain)

Geforce GTX 670		29280 Mpixels/sec
Radeon HD 4850 512MB		10000 Mpixels/sec
	Difference: 19280 (193%)

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 max amount of data (in units of MB per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is calculated 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 video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.