GeForce GTS 450 vs Radeon R9 M390X

Intro

Compare those specs to the Radeon R9 M390X, which has GPU clock speed of 723 MHz, and 4096 MB of GDDR5 memory running at 1250 MHz through a 256-bit bus. It also is made up of 2048 SPUs, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTS 450		106 Watts
Radeon R9 M390X		125 Watts
	Difference: 19 Watts (18%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 M390X is 177% faster than the GeForce GTS 450 in general, because of its greater data rate. (explain)

Radeon R9 M390X		160000 MB/sec
GeForce GTS 450		57728 MB/sec
	Difference: 102272 (177%)

Texel Rate

The Radeon R9 M390X will be much (more or less 269%) better at anisotropic filtering than the GeForce GTS 450. (explain)

Radeon R9 M390X		92544 Mtexels/sec
GeForce GTS 450		25056 Mtexels/sec
	Difference: 67488 (269%)

Pixel Rate

The Radeon R9 M390X will be much (approximately 85%) more effective at anti-aliasing than the GeForce GTS 450, and also capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon R9 M390X		23136 Mpixels/sec
GeForce GTS 450		12528 Mpixels/sec
	Difference: 10608 (85%)

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 MB per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the 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 number of pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.