GeForce GTS 450 vs GeForce GTX 850M

Intro

Compare all of that to the GeForce GTX 850M, which makes use of a 28 nm design. nVidia has clocked the core frequency at 876 MHz. The DDR3 memory works at a speed of 1000 MHz on this particular card. It features 640 SPUs along with 40 Texture Address Units and 16 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce GTX 850M		3340 points
GeForce GTS 450		1453 points
	Difference: 1887 (130%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
GeForce GTS 450		106 Watts
	Difference: 66 Watts (165%)

Memory Bandwidth

Performance-wise, the GeForce GTS 450 should in theory be quite a bit better than the GeForce GTX 850M overall. (explain)

GeForce GTS 450		57728 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 25728 (80%)

Texel Rate

The GeForce GTX 850M is quite a bit (about 40%) faster with regards to texture filtering than the GeForce GTS 450. (explain)

GeForce GTX 850M		35040 Mtexels/sec
GeForce GTS 450		25056 Mtexels/sec
	Difference: 9984 (40%)

Pixel Rate

The GeForce GTX 850M will be a bit (about 12%) more effective at full screen anti-aliasing than the GeForce GTS 450, and will be able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 850M		14016 Mpixels/sec
GeForce GTS 450		12528 Mpixels/sec
	Difference: 1488 (12%)

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 information (in units of megabytes per second) that can be moved past the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is worked out by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to the local memory per 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 - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.