NVIDIA GeForce GTX 260M vs NVIDIA GeForce GTX 285M SLI vs NVIDIA GeForce GTX 285M
NVIDIA GeForce GTX 260M► remove
The NVidia GeForce GTX 260M is a high-end graphics card of the 200M series based on the G92b core. Therefore, the 55nm chip is essentially a 9800M GTX with slightly higher clock rates (550/1375/950 vs. 500/1250/800). As a result, the 260M is more similar to the desktop 9800GT than the GTX 260.
As with all native DirectX 10 cards, the GeForce GTX 260M renders 3D images using "Unified Shaders". Dedicated pixel shaders and vertex shaders have been replaced with 112 stream processors in the 260M, which now take over most of the graphics workload. The shader units themselves are also clocked higher (1375 MHz) than the core chip.
In general, the performance of the GTX 260M is somewhat higher than the 9800M GTX due to the higher clock speed. For current DirectX 10 games such as Crysis, World in Conflict, Bioshock or Age of Conan, the 260M is sufficient for gameplay under medium to high detail settings. Meanwhile, older games should be able to run fluently under high resolutions and full details. VRAM can be up to 1024 MB GDDR3 at 950MHz in MXM 3.0 or 800MHz in MXM 2.0.
The GeForce GTX 260M integrates the PureVideo HD video decoder. The GPU is thus able to assist the CPU in the decoding of H.264-, VC-1-, MPEG2- and WMV9 videos.
HybridPower is a Windows Vista-only technology that allows users to switch between the integrated and dedicated graphics core for power-saving purposes. In the future, Nvidia intends to evolve the software for automatic switching depending on the active application (now known as Optimus). GeForceBoost is not supported with the GTX 260M as there would be no performance gain from combining with the integrated GPU.
The high current consumption of up to 75 Watts (of the entire MXM board) means that the GTX 260M can typically only be found in larger notebooks with loud and powerful cooling systems.
Compared with Desktop graphics cards, the GTX 260M is most similar to the GeForce 9800 GT.
NVIDIA GeForce GTX 285M SLI► remove
The Nvidia GeForce GTX 285M SLI is a graphics solution that combines two Nvidia GeForce GTX 285M with an SLI connection. 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 each card take turns rendering a frame in an alternating manner. Therefore, the SLI solution may suffer from noticeable micro stuttering at frame-rates between 20-30 fps (due to display irregularities between each rendered frame).
Each of the two GeForce GTX 285M is based on the G92b core and is therefore produced in 55nm. It features the full 128 pipelines of the G92b core and is therefore comparable to the desktop 9800M GTX+ and not the desktop GTX 280.
The Nvidia GeForce GTX 285M SLI in laptops with Core 2 Duo CPUs is bundled with the GeForce 9400M G chipset and therefore supports HybridPower (if the manufacturer enables it). With HybridPower, both GTX cards can be disabled and only the chipset graphics core can run, leading to improved battery life (and possibly less fan noise). Modern Core i7 laptops are using an Intel chipset and do not support HybridPower.
Since there are two GTX 285M cards active in SLI, the electrical current consumption and exhumed heat are about twice as much as what a single GTX 285M can produce. Due to the large power and cooling requirements, this SLI combination can only be found in large DTR laptops (like the Alienware M17x).
NVIDIA GeForce GTX 285M► remove
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 260M||NVIDIA GeForce GTX 285M SLI||NVIDIA GeForce GTX 285M|
|GeForce GTX 200M Series|
|112 -||256 -||128 -|
|Core||550 MHz||576 MHz||576 MHz|
|Shader||1375 MHz||1500 MHz||1500 MHz|
|Memory||950 MHz||1020 MHz||1020 MHz|
|Bus||256 Bit||256 Bit||256 Bit|
|Max. Memory||1024 MB||2048 (2x1024) MB||1024 MB|
|DirectX||DirectX 10, 4.0||DirectX 10, 4.0||DirectX 10, 4.0|
|Transistors||754 Million||1508 Million||754 Million|
|Technology||55 nm||55 nm||55 nm|
|Features||HybridPower, PureVideo HD, CUDA, PhysX ready||HybridPower, PureVideo HD, CUDA, PhysX ready||HybridPower, PureVideo HD (VP2), CUDA, PhysX ready|
|MXM 3||MXM 3||MXM 3|