NVIDIA GeForce GT 650M SLI vs NVIDIA GeForce GT 635M vs NVIDIA GeForce GT 620M
NVIDIA GeForce GT 650M SLI
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The NVIDIA GeForce GT 650M SLI is a high-end DirectX 11-compatible graphics solution for laptops, consisting of two GeForce GT 650M. Each card has a 28nm GK107 core based on the Kepler architecture. With SLI, each card usually renders a single frame (AFR mode). Therefore, it may suffer from micro stuttering in low fps ranges of 30fps. This happens because of different timespans between two frames (e.g., irregular delays between sequential frames). The 650M SLI is currently used only in the Lenovo Y500 with fast GDDR5 graphics memory and clock rates of 790 to 835 MHz (GeForce Boost).
Architecture
The Kepler architecture is the successor to the Fermi architecture that first appeared in laptops with the GeForce 400M series. The GK107 Kepler core offers two shader blocks, called SMX, each with 192 shaders for a total of 384 shader cores that are clocked at the same speed as the central core. Although more shader cores are available in the Kepler architecture as compared to the Fermi design, the Kepler shaders are still expected to be up to twice as power efficient. However, due to the missing hot clock of the shader domain, two shaders of a Kepler chip are about as fast as one shader of a Fermi chip (as the latter is clocked twice as fast). PCIe 3.0 is now supported by the mobile Kepler series and an optional Turbo mode can automatically overclock the Nvidia card by a theoretical 15 percent if the laptop cooling system allows it. The implementation of this boost mode is done in the BIOS, but it is ultimately dependent upon the manufacturer of the laptop.
Performance
The gaming performance of the SLI combination ranges between a GeForce GTX 670MX (maximum, e.g. in 3DMark 11 benchmarks) down to a single GeForce GT 650M (if SLI is not supported by the game). On average the 650M SLI could therefore be placed a bit above a Geforce GTX 660M in the high-end class. Modern games of 2012 should therefore be playable with high detail settings.
Features
The improved feature set now includes support for up to 4 active displays. Furthermore, high resolution monitors of up to 3840x2160 pixels can now be connected using DisplayPort 1.2 or HDMI 1.4a if available. HD-Audio codecs, such as Dolby TrueHD and DTS-HD, can be transmitted via bitstream mode through the HDMI port. However, as most laptops will feature Optimus, the integrated GPU will likely have direct control over the display ports and may limit the feature set available by the Nvidia Kepler cards.
The 5th generation PureVideo HD video processor (VP5) is also integrated in the GK107 core and offers hardware decoding of HD videos. Common codecs such as MPEG-1/2, MPEG-4 ASP, H.264 and VC1/WMV9 are fully supported up to 4K resolutions while VC1 and MPEG-4 are supported up to 1080p. Two streams can be decoded in parallel for features such as Picture-in-Picture. Another novelty is the inclusion of a dedicated video encoding engine similar to Intel QuickSync that can be accessed by the NVENC API.
The power consumption of the GeForce GT 650M SLI should double compared to a single GTX 650M. Therefore, only large laptops can handle the heat dissipation.
NVIDIA GeForce GT 635M
► remove from comparisonThe NVIDIA GeForce GT 635M is a fast middle class graphics card for laptops and is essentially a renamed GeForce GT 555M. It is based on the GF108 or GF116 cores with different shader counts, clock speeds and memory configurations. It stems from the Fermi generation and supports DirectX 11 and OpenGL 4.0.
Versions (of the GT 555M):
- 144 cores 709MHz, 128Bit GDDR5, e.g. MSI GX780
- 144 cores 590MHz, 192Bit DDR3, e.g. Dell XPS 17, Alienware M14x
- 144 cores 590MHz, 128Bit DDR3, e.g. Schenker XMG A501 / A701 (Clevo W150HRM / W170HN)
- 96 cores 753MHz, 128Bit GDDR5, e.g. Lenovo Y570p / Y560p
Architecture
The GF114 and GF116 chips are slightly reworked architectures that were introduced in 2011. Due to a changed transistor design, the clock rates could be higher without increasing overall power consumption. Detailed information on the GF106 can be found on the GeForce GT 555M page and information on the GF104 on the GeForce GT 435M page.
Performance
The performance of the GeForce GT 635M is dependent on the version of the card used (see above). The performance range is similar to the former GT 555M and somewhat below the Kepler based GT 640M. Therefore, most modern games run fluently in medium to high settings in 1366x768. Only very demanding games like Metro 2033 or Battlefield 3 will require lower settings (see our benchmark tests below).
Features
A novelty of the GF104/106/108 chips is the support of Bitstream HD Audio (Blu-Ray) output via HDMI. Like the Radeon HD 5730, the GT 635M can transfer Dolby True HD and DTS-HD bitstream to a HiFi receiver without quality loss.
The GT 635M offers PureVideo HD technology for video decoding. The included Video Processor 4 (VP4) supports feature set C and allows the GPU to fully decode MPEG-1, MPEG-2, MPEG-4 Part 2 (MPEG-4 ASP - e.g., DivX or Xvid), VC-1/WMV9, and H.264 (VLD, IDCT, Motion Compensation, and Deblocking). This can free up processing time from the CPU, leading to better multitasking performance.
Furthermore, the GPU is able to decode two 1080p streams simultaneously (e.g., for Blu-Ray Picture-in-Picture).
Through CUDA, OpenCL, and DirectCompute 2.1 support, the GeForce GT 635M can be of help in general calculations. For example, the stream processor can encode videos considerably quicker than can a modern CPU. Furthermore, physics calculations can be done by the GPU using PhysX if supported, such as in Mafia 2 or Metro 2033.
According to Nvidia, the GT 635M supports 3D Vision. It enables the laptop to output 3D content (3D games, 3D Web Streaming, 3D photos, 3D Blu-Rays) to a 3D-enabled screen or an external 3D TV if supported by the laptop manufacturer and when not in conjunction with Optimus.
The relatively high power consumption of the GeForce GT 635M suits it for larger laptops starting from 14-inches. To save power, the card supports Optimus to automatically switch between the integrated Intel graphics card and the Nvidia GPU. Even though the video card natively supports Optimus, it is up to the manufacturer to implement the technology.
NVIDIA GeForce GT 620M
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The NVIDIA GeForce GT 620M is an entry-level, DirectX 11 compatible graphics card that was announced in the first quarter of 2012 for laptops. Its core can be based on either the 40nm GF108 chip (similar to the GeForce GT 525M) or the new power-optimized 28nm GF117 chip with 64-bit or 128-bit DDR3 memory. Both architectures still stem directly from the Fermi generation.
It should be noted that the 28nm version of the GT 620M does not offer dedicated graphics ports and can therefore only be used in conjunction with Optimus.
Architecture
The GF117 is based on the optimized GF108 Fermi chip (GeForce GT 540M) and offers 96 shaders, 16 TMUs and 4 ROPs. Each shader core is clocked twice as fast as the rest of the graphics chip, a technique known as hot clocking. More detailed information on Fermi can be found on the GT 435M GPU page.
Performance
The 128-bit version of the GeForce GT 620M (with turbo) performs similarly to the older GeForce GT 540M due to their similar clock rates and core architecture. Therefore, modern and demanding games are playable in low to medium settings at 1366x768 pixel resolution. The rumored 64-bit version will likely suffer from the reduced bandwidth and offer slower performance in comparison.
Features
The shader cores (also called CUDA cores) can be used for general calculations with APIs such as CUDA, DirectCompute 2.1 and OpenCL. PhysX is theoretically possible, but the GT 620M is too slow to handle both PhysX and 3D rendering for modern games. 3D Vision is not supported according to Nvidia.
Nvidia claims that the power consumption of the Geforce GT 620M should be below that of the GeForce GT 525M due to the improved efficiency of the GF117 architecture.
| NVIDIA GeForce GT 650M SLI | NVIDIA GeForce GT 635M | NVIDIA GeForce GT 620M | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| GeForce GT 600M Series |
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| Codename | N13E-GE | N13E-GE2 | N13P-GLP / N13M-GS | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Architecture | Kepler | Fermi | Fermi | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Pipelines | 768 - unified | 144 - unified | 96 - unified | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Core Speed | 790 - 835 (Boost) MHz | 660 - 753 (Boost) MHz | 625 - 715 (Boost) MHz | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Memory Speed | 4000 MHz | 1800 MHz | 1800 MHz | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Memory Bus Width | 2x 128 Bit | 128/192 Bit | 64 / 128 Bit | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Memory Type | GDDR5 | DDR3, GDDR5 | DDR3 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Max. Amount of Memory | 2x2048 MB | 2048 MB | 1024 MB | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shared Memory | no | no | no | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| API | DirectX 11, Shader 5.0 | DirectX 11, Shader 5.0 | DirectX 11, Shader 5.0 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| technology | 28 nm | 40 nm | 40 nm | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Features | Optimus, PhysX, Verde Drivers, CUDA, 3D Vision, 3DTV Play | PhysX, Verde Drivers, CUDA, Play, Optimus | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Notebook Size | medium sized | large | medium sized | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Date of Announcement | 22.03.2012 | 06.12.2011 | 22.03.2012 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shader Speed | 1320-1505 MHz | 1250 MHz |
Benchmarks
3DM Vant. Perf. total + NVIDIA GeForce GT 650M SLI
specvp11 snx-01 + NVIDIA GeForce GT 650M SLI
Average Benchmarks NVIDIA GeForce GT 650M SLI → 100% n=9
Average Benchmarks NVIDIA GeForce GT 635M → 50% n=9
Average Benchmarks NVIDIA GeForce GT 620M → 42% n=9
- Average benchmark values for this graphics card* Smaller numbers mean a higher performance
1 This benchmark is not used for the average calculation
Game Benchmarks
The following benchmarks stem from our benchmarks of review laptops. The performance depends on the used graphics memory, clock rate, processor, system settings, drivers, and operating systems. So the results don't have to be representative for all laptops with this GPU. For detailed information on the benchmark results, click on the fps number.
Far Cry 3
2012
Assassin´s Creed III
2012
Hitman: Absolution
2012
Dishonored
2012
World of Tanks v8
2012
Fifa 13
2012
F1 2012
2012
Borderlands 2
2012
Guild Wars 2
2012
Counter-Strike: GO
2012
Darksiders II
2012
Sleeping Dogs
2012
Max Payne 3
2012
Dirt Showdown
2012
Diablo III
2012
Risen 2: Dark Waters
2012
Mass Effect 3
2012
Alan Wake
2012
Anno 2070
2011
Battlefield 3
2011
Batman: Arkham City
2011
Fifa 12
2011
F1 2011
2011
Dirt 3
2011
Crysis 2
2011
Mafia 2
2010
StarCraft 2
2010
Metro 2033
2010
Risen
2009Average Gaming NVIDIA GeForce GT 650M SLI → 100%
Average Gaming 30-70 fps → 100%
Average Gaming NVIDIA GeForce GT 635M → 49%
Average Gaming 30-70 fps → 51%
Average Gaming NVIDIA GeForce GT 620M → 38%
Average Gaming 30-70 fps → 40%
| NVIDIA GeForce GT 650M SLI | NVIDIA GeForce GT 635M | NVIDIA GeForce GT 620M | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| low | med. | high | ultra | QHD | 4K | low | med. | high | ultra | QHD | 4K | low | med. | high | ultra | QHD | 4K | ||||
| Far Cry 3 | 105.7 | 88.8 | 42.6 | 15.6 | |||||||||||||||||
| Assassin´s Creed III | 63 | 59.9 | 22.2 | ||||||||||||||||||
| Hitman: Absolution | 68.4 | 59.7 | 35.8 | 19.1 | 42.5 | 26.9 | 12.7 | 35 | 25.8 | 14.9 | |||||||||||
| Call of Duty: Black Ops 2 | 147.7 | 121.3 | 81.8 | 55.3 | |||||||||||||||||
| Need for Speed: Most Wanted | 59.9 | 49.6 | 29.9 | 17.4 | |||||||||||||||||
| Medal of Honor: Warfighter | 118.9 | 86.6 | 71.3 | 31.2 | 39 | 25 | 18 | ||||||||||||||
| Dishonored | 128.5 | 128 | 123.3 | 95.8 | 67.4 | 58.7 | 55.3 | 52 | 40 | 35 | |||||||||||
| Fifa 13 | 274.2 | 225.1 | 208.4 | 194.4 | 238 | 147 | 125 | 72 | 165 | 128 | 102 | 63 | |||||||||
| F1 2012 | 140 | 114 | 109 | 53 | 75 | 66 | 52 | 19 | 59 | 31 | 29 | ||||||||||
| Borderlands 2 | 89.9 | 79.6 | 78.2 | 59.9 | |||||||||||||||||
| Guild Wars 2 | 92 | 47.1 | 23.2 | ||||||||||||||||||
| Counter-Strike: GO | 246.9 | 218.7 | 199.7 | 138.7 | 166.9 | 117.2 | 81.6 | 35.9 | |||||||||||||
| Darksiders II | 116.9 | 69.8 | |||||||||||||||||||
| Sleeping Dogs | 135.9 | 97.7 | 52.5 | 13.6 | |||||||||||||||||
| Max Payne 3 | 74.8 | 71.6 | 33.1 | 26.1 | |||||||||||||||||
| Dirt Showdown | 104.7 | 74 | 51 | 19 | 49 | 33 | 25 | ||||||||||||||
| Diablo III | 241.4 | 197 | 178.4 | 106.7 | 98.9 | 65.5 | 57.6 | 82 | 52 | 41 | 21.12 | ||||||||||
| Risen 2: Dark Waters | 95.7 | 76.7 | 61.2 | 29.8 | |||||||||||||||||
| Mass Effect 3 | 59.9 | 59.9 | 59.8 | 54 | 39 | 24 | 49 | 33 | 21.8 | ||||||||||||
| Alan Wake | 100.4 | 63.6 | 30.8 | 31.7 | 16.5 | ||||||||||||||||
| Anno 2070 | 147.5 | 78.9 | 55 | 31 | 83 | 32 | 21 | 10 | 76 | 34 | 21 | 9.87 | |||||||||
| The Elder Scrolls V: Skyrim | 90.4 | 73.4 | 45.4 | 47 | 34 | 25 | 14 | 37 | 29 | 21 | |||||||||||
| CoD: Modern Warfare 3 | 176.5 | 152.3 | 124.1 | 73.6 | |||||||||||||||||
| Battlefield 3 | 92.3 | 71 | 55 | 26.8 | 45.8 | 28.9 | 20.8 | 29 | 20 | 15 | |||||||||||
| Batman: Arkham City | 43.1 | 23.8 | |||||||||||||||||||
| Mafia 2 | 74.5 | 58.2 | 76.3 | 61.7 | 53.9 | 34.6 | |||||||||||||||
| Metro 2033 | 79.1 | 19.9 | |||||||||||||||||||
| NVIDIA GeForce GT 650M SLI | NVIDIA GeForce GT 635M | NVIDIA GeForce GT 620M | |||||||||||||||||||
| low | med. | high | ultra | QHD | 4K | low | med. | high | ultra | QHD | 4K | low | med. | high | ultra | QHD | 4K | < 30 fps < 60 fps < 120 fps ≥ 120 fps | 2 10 9 | 2 14 6 | 1 11 8 5 | 12 9 4 2 | | | < 30 fps < 60 fps < 120 fps ≥ 120 fps | 4 5 2 | 2 3 4 1 | 4 5 1 1 | 4 2 1 | | | < 30 fps < 60 fps < 120 fps ≥ 120 fps | 1 8 2 1 | 5 5 1 | 7 3 1 | 3 1 | | |
For more games that might be playable and a list of all games and graphics cards visit our Gaming List
