GeForce 9800 GTX vs GeForce GTX 650

Intro

Compare that to the GeForce GTX 650, which uses a 28 nm design. nVidia has clocked the core frequency at 1058 MHz. The GDDR5 RAM works at a frequency of 1250 MHz on this specific card. It features 384 SPUs as well as 32 Texture Address Units and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
GeForce 9800 GTX		140 Watts
	Difference: 76 Watts (119%)

Memory Bandwidth

Performance-wise, the GeForce GTX 650 should theoretically be a bit superior to the GeForce 9800 GTX in general. (explain)

GeForce GTX 650		80000 MB/sec
GeForce 9800 GTX		70400 MB/sec
	Difference: 9600 (14%)

Texel Rate

The GeForce 9800 GTX is much (more or less 28%) faster with regards to AF than the GeForce GTX 650. (explain)

GeForce 9800 GTX		43200 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 9344 (28%)

Pixel Rate

The GeForce GTX 650 is quite a bit (about 57%) more effective at full screen anti-aliasing than the GeForce 9800 GTX, and also capable of handling higher resolutions better. (explain)

GeForce GTX 650		16928 Mpixels/sec
GeForce 9800 GTX		10800 Mpixels/sec
	Difference: 6128 (57%)

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 information (counted in MB per second) that can be transported past the external memory interface within a second. It's calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.