NVIDIA GeForce GTX 280M SLI vs NVIDIA GeForce GTX 285M
NVIDIA GeForce GTX 280M SLI► remove from comparison
The Nvidia GeForce GTX 280M SLI is a graphics solution that combines two Nvidia GeForce GTX 280M cards in an SLI setup. As not every game supports SLI efficiently, the performance increase compared to a single card is only about 0-40%. The most frequently used technique is Alternate Frame Rendering (AFR), where one card renders every odd frame while the second card renders every even frame. Due to the SLI setup, users may experience micro stuttering due to the irregular delays between sequential frames.
Each of the two GeForce GTX 280M is based on the G92b core and is produced in 55nm. It features the full 128 pipelines of the G92b and is therefore more comparable to the desktop 9800M GTX+ than the desktop GTX 280.
The Nvidia GeForce GTX 280M SLI is bundled with the GeForce 9400M G chipset (for laptops based on the Core 2 Duo) and therefore supports HybridPower if supported by the manufacturer. With HybridPower, both GTX cards can be disabled and only the chipset graphics core can run, leading to longer battery life (and possibly less fan noise). Modern Core i7 laptops use an Intel chipset and do not support HybridPower.
Since there are two GTX 280 cards active in SLI, the electric current consumption and exhumed heat are about twice as much as what a single GTX 280M can produce. Due to the large power and cooling requirements, this SLI combination is usually reserved for large desktop replacement (DTR) laptops (like the Alienware M17x).
NVIDIA GeForce GTX 285M► remove from comparison
The NVIDIA GeForce GTX 285M is a high-end graphic card of the 200M series based on the G92b core and most similar to the Desktop GeForce 9800 GTX+. Therefore the 285M cannot be directly compared to the Desktop GTX 285. The chip is produced in a 55nm fabrication process, which is a step up from the 65nm process of the GTX 9800M. Its 128 pipelines are all enabled as well, as opposed to only 112 pipelines of the GTX 9800M. Compared to the GTX 280M, the GTX 285M features a slightly higher clock speed and is therefore only marginally faster (3-6% on average).
An innovation in the 200M series is the much accelerated switch times if using Hybrid Power (lower than 1 second compared to 7 seconds at the 9800M GTX).
Similar to all other cards with native DirectX 10 capabilities, the GeForce GTX 285M renders 3D images using "Unified Shaders". In other words, there are no longer any more dedicated pixel shaders or vertex shaders. Instead, new stream processors (128 of them in the 285M) now process most of the heavy graphics loading that would have otherwise been done by dedicated pixel and vertex shaders. In fact, the shader units are clocked higher than the core chip itself.
As previously mentioned, the GTX 285M is about 3-6% faster than the GTX280M due to slightly higher clock speeds. This means that notebooks equipped with the GTX 285M should run all modern and demanding games (as of 2009) in high details and resolutions. Only very demanding games, like Crysis Warhead or Metro 2033, may become unplayable if at maximum graphical settings.
Games with PhysX support (e.g., Mirror's Edge) may benefit from improved performance out of the 285M. Still, the Mobility Radeon HD 5870 is arguably a faster and better value single core GPU for laptops.
An advantage of the GeForce GTX 285M is the integrated PureVideo HD video processor (VP2). With this software feature, the 285M can assist the CPU in the decoding of H.264-, VC-1-, MPEG2- or WMV9 videos.
HybridPower is an Nvidia power-saving technology for Windows Vista used for switching between integrated and dedicated graphics cards. In the future, Nvidia wants this switch to occur automatically with drivers (now known as Optimus). GeForceBoost is not supported with the 285M, as there would be no performance gain in combining the integrated GPU with the dedicated video card.
The power consumption can be up to 75 Watts (if including the MXM board and VRAM). As a result, the 285M is usually reserved for larger desktop replacement (DTR) laptops with powerful cooling solutions.
In June 2010, the GeForce GTX 480M (mobile Fermi) was announced with a revamped architecture compared to the GTX 285M. Compared to the 285M, the Fermi core will support DirectX 11 and offer better performance at the cost of higher power consumption levels and possibly higher heat output.
If compared to desktop graphics cards, the performance of the 285M can be considered somewhere in between the 9800 GT and the 9800 GTX, the latter of which is clocked considerably higher (675/1675/1100 MHz) in comparison.
|NVIDIA GeForce GTX 280M SLI||NVIDIA GeForce GTX 285M|
|GeForce GTX 200M Series|
|Pipelines||256 - unified||128 - unified|
|Core Speed||585 MHz||576 MHz|
|Shader Speed||1463 MHz||1500 MHz|
|Memory Speed||950 MHz||1020 MHz|
|Memory Bus Width||256 Bit||256 Bit|
|Max. Amount of Memory||2048 MB||1024 MB|
|API||DirectX 10, Shader 4.0||DirectX 10, Shader 4.0|
|Power Consumption||150 Watt|
|Transistors||1.5 Billion||754 Million|
|technology||55 nm||55 nm|
|Features||HybridPower, PureVideo HD, CUDA, PhysX ready||HybridPower, PureVideo HD (VP2), CUDA, PhysX ready|
|Date of Announcement||02.03.2009||02.03.2009|
|Information||MXM 3||MXM 3|
|Link to Manufacturer Page||http://www.nvidia.com/object/product_gef...||http://www.nvidia.com/object/product_gef...|
3DM Vant. Perf. total + NVIDIA GeForce GTX 280M SLI