GeForce GT 640 DDR3 vs Radeon RX 6650 XT

Intro

Compare those specs to the Radeon RX 6650 XT, which comes with a core clock speed of 2055 MHz and a GDDR6 memory speed of 2190 MHz. It also makes use of a 128-bit bus, and uses a 7 nm design. It is comprised of 2048 SPUs, 128 Texture Address Units, and 64 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Radeon RX 6650 XT		176 Watts
	Difference: 111 Watts (171%)

Memory Bandwidth

In theory, the Radeon RX 6650 XT will be 403% faster than the GeForce GT 640 DDR3 overall, due to its higher bandwidth. (explain)

Radeon RX 6650 XT		287072 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 230048 (403%)

Texel Rate

The Radeon RX 6650 XT is quite a bit (more or less 813%) more effective at AF than the GeForce GT 640 DDR3. (explain)

Radeon RX 6650 XT		263040 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 234240 (813%)

Pixel Rate

The Radeon RX 6650 XT is quite a bit (approximately 813%) faster with regards to FSAA than the GeForce GT 640 DDR3, and will be able to handle higher resolutions without losing too much performance. (explain)

Radeon RX 6650 XT		131520 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 117120 (813%)

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 largest amount of data (measured in MB per second) that can be transported over the external memory interface in one second. The number is calculated by multiplying the bus width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better 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 number of texture map elements (texels) that are processed per second. This is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at 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 graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the clock 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 quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.