Latest Mobile Graphics Chips
Nvidia’s GeForce2 Go
In desktop computers, video cards from Nvidia, especially on the chips of the GeForce series, are very popular. Naturally, everyone is looking forward to when such chips appear on laptops. They will appear, of course, but not based on the GeForce2 Ultra, as many would like. The GeForce2 Ultra graphics chip consumes too much power and generates too much heat to be used on mobile systems.
The GeForce2 Go mobile graphics chip is based on the GeForce2 MX chip, a custom desktop option. Due to the rather low price and decent performance, a lot of video card manufacturers use the GeForce2 MX graphics chips. The GeForce2 MX graphics chip supports TwinView, a technology for signal output to two receivers. The GeForce2 MX has two separate and independent video paths and two CRTC (Cathode Ray Tube Controller), which transmit data generated by the GPU to the built-in digital-to-analog converter (RAMDAC), to an external, optional RAMDAC, to a two-channel digital signal transmitter or to a telecoder . The GeForce2 MX memory bus can be 32/64/128-bit and supports both SDRAM and DDR SDRAM. Of course, there will be a big gap in performance between video adapters built on the basis of 8-megabyte 32-bit SDRAM and 32-megabyte 128-bit DDR SDRAM. All this makes it possible for manufacturers on the basis of a single GeForce2 MX chip to implement several modifications of video cards.
The graphics chip has a built-in Dual Link TMDS transmitter unit, which allows digital displays to be connected without additional controllers, which is very convenient for laptop developers and manufacturers.
In general, the GeForce2 MX (NV 11) is a somewhat stripped-down version of the GeForce2 GTS (NV 15). The GeForce2 MX core has two pixel pipelines with two texture units in each pipeline. The GeForce2 GTS has four pixel pipelines with two texture units each. Therefore, the performance of the GeForce2 MX is theoretically two times lower than that of the GeForce2 GTS. But due to this, energy consumption is reduced.
A distinctive feature of the GeForce2 MX is the presence of the T&L transformation and lighting unit left from the “big brother” – NV 15. Previously, this unit was part of only the most high-performance graphics chips. This suggests that in the near future all games will use the transformation and lighting unit with full load not only in “advanced” desktop computers, but also in laptops. Over time, obviously, this block will become standard and many serious applications will also “learn” to use it.
What, in fact, is the new GeForce2 Go mobile core? The GeForce2 Go chip differs slightly from its prototype – GeForce2 MX –
GPU and memory clock speeds are reduced;
To reduce heat dissipation and energy consumption by the chip, the voltage supplied to the core of the GPU is lowered.
Based on the GeForce2 Go GPU, one of the leaders in notebook production –Toshiba has developed a new series of notebooks. The Toshiba Satellite 2805-S402 model uses the GeForce2 Go with 16-megabyte 64-bit DDR SDRAM, while the graphics processor operates at a frequency of 143 MHz and the memory at 166 MHz.