GeForce 900 series

"GM200" redirects here. For the radars, see Ground Master 200 and Ground Master 200 Multi Mission.

For GeForce cards with a model number of 9XX0, see GeForce 9 series.

The GeForce 900 series is a family of graphics processing units developed by Nvidia, succeeding the GeForce 700 series and serving as the high-end introduction to the Maxwell microarchitecture, named after James Clerk Maxwell. They are produced with TSMC's 28 nm process.

GeForce 900 series

Nvidia GeForce GTX 980 Ti Founders Edition
Release date	September 18, 2014; 9 years ago (September 18, 2014)
Codename	GM20x
Architecture	Fermi Kepler Maxwell
Models	GeForce series GeForce GT series GeForce GTX series
Transistors	2.94B (GM206) 5.2B (GM204) 8.0B (GM200)
Fabrication process	TSMC 28 nm
Cards
Mid-range	GeForce GTX 950 GeForce GTX 960
High-end	GeForce GTX 970 GeForce GTX 980
Enthusiast	GeForce GTX 980 Ti GeForce GTX TITAN X
API support
DirectX	Direct3D 12 (feature level 12_1)^[2]^[3]^[4]^[5] Shader Model 6.7
OpenCL	OpenCL 3.0^[a]
OpenGL	OpenGL 4.6
Vulkan	Vulkan 1.3^[1] SPIR-V
History
Predecessor	GeForce 800M series GeForce 700 series
Successor	GeForce 10 series
Support status
Fermi cards unsupported Security updates for Kepler until September 2024 Maxwell fully supported

With Maxwell, the successor to Kepler, Nvidia expected three major outcomes: improved graphics capabilities, simplified programming, and better energy efficiency compared to the GeForce 700 series and GeForce 600 series.^[6]

Maxwell was announced in September 2010,^[7] with the first Maxwell-based GeForce consumer-class products released in early 2014.^[8]

Architecture

Main article: Maxwell (microarchitecture)

First generation Maxwell (GM10x)

First generation Maxwell GM107/GM108 were released as GeForce GTX 745, GTX 750/750 Ti and GTX 850M/860M (GM107) and GT 830M/840M (GM108). These new chips provide few consumer-facing additional features; Nvidia instead focused on power efficiency. Nvidia increased the amount of L2 cache from 256 KiB on GK107 to 2 MiB on GM107, reducing the memory bandwidth needed. Accordingly, Nvidia cut the memory bus from 192 bit on GK106 to 128 bit on GM107, further saving power.^[9] Nvidia also changed the streaming multiprocessor design from that of Kepler (SMX), naming it SMM. The structure of the warp scheduler is inherited from Kepler, which allows each scheduler to issue up to two instructions that are independent from each other and are in order from the same warp. The layout of SMM units is partitioned so that each of the 4 warp schedulers in an SMM controls 1 set of 32 FP32 CUDA cores, 1 set of 8 load/store units, and 1 set of 8 special function units. This is in contrast to Kepler, where each SMX has 4 schedulers that schedule to a shared pool of 6 sets of 32 FP32 CUDA cores, 2 sets of 16 load/store units, and 2 sets of 16 special function units.^[10] These units are connected by a crossbar that uses power to allow the resources to be shared.^[10] This crossbar is removed in Maxwell.^[10] Texture units and FP64 CUDA cores are still shared.^[9] SMM allows for a finer-grain allocation of resources than SMX, saving power when the workload isn't optimal for shared resources. Nvidia claims a 128 CUDA core SMM has 86% of the performance of a 192 CUDA core SMX.^[9] Also, each Graphics Processing Cluster, or GPC, contains up to 4 SMX units in Kepler, and up to 5 SMM units in first generation Maxwell.^[9]

GM107 supports CUDA Compute Capability 5.0 compared to 3.5 on GK110/GK208 GPUs and 3.0 on GK10x GPUs. Dynamic Parallelism and HyperQ, two features in GK110/GK208 GPUs, are also supported across the entire Maxwell product line.

Maxwell provides native shared memory atomic operations for 32-bit integers and native shared memory 32-bit and 64-bit compare-and-swap (CAS), which can be used to implement other atomic functions.

While it was once thought that Maxwell used tile-based immediate mode rasterization,^[11] Nvidia corrected this at GDC 2017 saying Maxwell instead uses Tile Caching.^[12]

NVENC

Main article: Nvidia NVENC

Maxwell-based GPUs also contain the NVENC SIP block introduced with Kepler. Nvidia's video encoder, NVENC, is 1.5 to 2 times faster than on Kepler-based GPUs meaning it can encode video at 6 to 8 times playback speed.^[9]

PureVideo

Main article: Nvidia PureVideo

Nvidia also claims an 8 to 10 times performance increase in PureVideo Feature Set E video decoding due to the video decoder cache paired with increases in memory efficiency. However, H.265 is not supported for full hardware decoding, relying on a mix of hardware and software decoding.^[9] When decoding video, a new low power state "GC5" is used on Maxwell GPUs to conserve power.^[9]

Second generation Maxwell (GM20x)

Second generation Maxwell introduced several new technologies: Dynamic Super Resolution,^[13] Third Generation Delta Color Compression,^[14] Multi-Pixel Programming Sampling,^[15] Nvidia VXGI (Real-Time-Voxel-Global Illumination),^[16] VR Direct,^[17][18][19] Multi-Projection Acceleration,^[14] and Multi-Frame Sampled Anti-Aliasing (MFAA)^[20] (however support for Coverage-Sampling Anti-Aliasing (CSAA) was removed).^[21] HDMI 2.0 support was also added.^[22][23]

Second generation Maxwell also changed the ROP to memory controller ratio from 8:1 to 16:1.^[24] However, some of the ROPs are generally idle in the GTX 970 because there are not enough enabled SMMs to give them work to do and therefore reduces its maximum fill rate.^[25]

Second generation upgraded NVENC which supports HEVC encoding and adds support for H.264 encoding resolutions at 1440p/60FPS & 4K/60FPS compared to NVENC on Maxwell first generation GM10x GPUs which only supported H.264 1080p/60FPS encoding.^[19]

Maxwell GM206 GPU supports full fixed function HEVC hardware decoding.^[26][27]

Advertising controversy

GTX 970 hardware specifications

Issues with the GeForce GTX 970's specifications were first brought up by users when they found out that the cards, while featuring 4 GB of memory, rarely accessed memory over the 3.5 GB boundary. Further testing and investigation eventually led to Nvidia issuing a statement that the card's initially announced specifications had been altered without notice before the card was made commercially available, and that the card took a performance hit once memory over the 3.5 GB limit were put into use.^[28][29][30]

The card's back-end hardware specifications, initially announced as being identical to those of the GeForce GTX 980, differed in the amount of L2 cache (1.75 MB versus 2 MB in the GeForce GTX 980) and the number of ROPs (56 versus 64 in the 980). Additionally, it was revealed that the card was designed to access its memory as a 3.5 GB section, plus a 0.5 GB one, access to the latter being 7 times slower than the first one.^[31] The company then went on to promise a specific driver modification in order to alleviate the performance issues produced by the cutbacks suffered by the card.^[32] However, Nvidia later clarified that the promise had been a miscommunication and there would be no specific driver update for the GTX 970.^[33] Nvidia claimed that it would assist customers who wanted refunds in obtaining them.^[34] On February 26, 2015, Nvidia CEO Jen-Hsun Huang went on record in Nvidia's official blog to apologize for the incident.^[35] In February 2015 a class-action lawsuit alleging false advertising was filed against Nvidia and Gigabyte Technology in the U.S. District Court for Northern California.^[36][37]

Nvidia revealed that it is able to disable individual units, each containing 256KB of L2 cache and 8 ROPs, without disabling whole memory controllers.^[38] This comes at the cost of dividing the memory bus into high speed and low speed segments that cannot be accessed at the same time unless one segment is reading while the other segment is writing because the L2/ROP unit managing both of the GDDR5 controllers shares the read return channel and the write data bus between the two GDDR5 controllers and itself.^[38] This is used in the GeForce GTX 970, which therefore can be described as having 3.5 GB in its high speed segment on a 224-bit bus and 0.5 GB in a low speed segment on a 32-bit bus.^[38]

On July 27, 2016, Nvidia agreed to a preliminary settlement of the U.S. class action lawsuit,^[36] offering a $30 refund on GTX 970 purchases. The agreed upon refund represents the portion of the cost of the storage and performance capabilities the consumers assumed they were obtaining when they purchased the card.^[39]

Async compute support

 

GTX TITAN X

While the Maxwell series was marketed as fully DirectX 12 compliant,^[3][40][41] Oxide Games, developer of Ashes of the Singularity, uncovered that Maxwell-based cards do not perform well when async compute is utilized.^{[42][43][44][40]}

It appears that while this core feature is in fact exposed by the driver,^[45] Nvidia partially implemented it through a driver-based shim, coming at a high performance cost.^[44] Unlike AMD's competing GCN-based graphics cards which include a full implementation of hardware-based asynchronous compute,^[46][47] Nvidia planned to rely on the driver to implement a software queue and a software distributor to forward asynchronous tasks to the hardware schedulers, capable of distributing the workload to the correct units.^[48] Asynchronous compute on Maxwell therefore requires that both a game and the GPU driver be specifically coded for asynchronous compute on Maxwell in order to enable this capability.^[49] The 3DMark Time Spy benchmark shows no noticeable performance difference between asynchronous compute being enabled or disabled.^[49] Asynchronous compute is disabled by the driver for Maxwell.^[49]

Oxide claims that this led to Nvidia pressuring them not to include the asynchronous compute feature in their benchmark at all, so that the 900 series would not be at a disadvantage against AMD's products which implement asynchronous compute in hardware.^[43]

Maxwell requires that the GPU be statically partitioned for asynchronous compute to allow tasks to run concurrently.^[50] Each partition is assigned to a hardware queue. If any of the queues that are assigned to a partition empty out or are unable to submit work for any reason (e.g. a task in the queue must be delayed until a hazard is resolved), the partition and all of the resources in that partition reserved for that queue will idle.^[50] Asynchronous compute therefore could easily hurt performance on Maxwell if it is not coded to work with Maxwell's static scheduler.^[50] Furthermore, graphics tasks saturate Nvidia GPUs much more easily than they do to AMD's GCN-based GPUs which are much more heavily weighted towards compute, so Nvidia GPUs have fewer scheduling holes that could be filled by asynchronous compute than AMD's.^[50] For these reasons, the driver forces a Maxwell GPU to place all tasks into one queue and execute each task in serial, and give each task the undivided resources of the GPU no matter whether or not each task can saturate the GPU or not.^[50]

Products

GeForce 900M (9xxM) series

Some implementations may use different specifications.

Model	Launch	Code name	Fab (nm)	Transistors (million)	Die size (mm^2)	Bus interface	Core config^[b]	Clock speeds			Fillrate		Memory				API support (version)				Processing power (GFLOPS)		TDP (watts)	SLI support^[c]
								Base core clock (MHz)	Boost core clock (MHz)	Memory (MT/s)	Pixel (GP/s)^[d]	Texture (GT/s)^[e]	Size (MiB)	Bandwidth (GB/s)	Type	Bus width (bit)	DirectX	OpenGL	OpenCL	Vulkan	Single precision^[f]	Double precision^[g]
GeForce 910M^[53]^[54]^[55]	Aug 18, 2015	GF117^[h]	28	585	116	PCIe 3.0 x8	96:16:8	775	1550	1800	3.1	12.4	1024	14.4	GDDR3	64	12.0 (11_0)^[2]^[5]	4.6	1.1	—	297.6	1/12 of SP	33	No
	March 15, 2015	GK208		Un­known	87		384:16:8	575	575		5.13	9.2	2048						1.2	1.1	441.6	18.4
GeForce 920M^[56]^[57]^[58]	March 13, 2015	GF117^[h]		585	116		96:16:8	775	1550		3.1	12.4	1024						1.1	—	297.6	1/12 of SP
		GK208		Un­known	87		384:32:16	954	954		7.6	30.5	2048						1.2	1.1	732.7	22.9
GeForce 920MX^[59]^[60]	March 2016	GM108^[i]		1870	148		256:24:8	1072	1176		8.58	25.7	2048		DDR3 GDDR5						549	1/32 of SP	16
GeForce 930M^[61]^[62]	March 13, 2015						384:24:8	928	941		7.4	22.3	2048		DDR3						712.7	22.3	33
GeForce 930MX^[63]^[64]	March 1, 2016			Un­known	Un­known	PCIe 3.0 x8	384:24:8	952	1020	2000	Un­known	Un­known	2048	Un­known	DDR3 GDDR5				Un­known	Un­known	Un­known	Un­known	Un­known	Un­known
GeForce 940M^[65]^[66]^[67]	March 13, 2015	GM107		1870	148	PCIe 3.0 x16	640:40:16	1029	1100	2002	16.5	41.2	2048	16 - 80.2	GDDR5 DDR3	128			1.2	1.1	1317	41.1	75	No
		GM108^[i]		Un­known	Un­known	PCIe 3.0 x8	384:24:8				8.2	24.7				64					790.3	24.7	33
GeForce 940MX^[68]^[69]	March 10, 2016			1870	148		384:24:8	1122	1242		8.98	26.93	2048 4096	16.02 (DDR3) 40.1 (GDDR5)							861.7	Un­known	23
GeForce 945M^[70]^[71]^[72]	2015	GM107				?	640:40:16	1029	1085	?	16.46	41.2	?	?	DDR3 GDDR5	128					1,317.1	?	75	?
		GM108^[i]		?	?	PCIe 3.0 x8	384:24:8	1122	1242		8.98	26.93				64					861.7		23
GeForce GT 945A^[73]^[74]	March 13, 2015			Un­known	Un­known		384:24:8	1072	1176	1800	8.58	25.73	2048	14.4	DDR3					Un­known	Un­known	Un­known	33	Un­known
GeForce GTX 950M^[75]^[76]	March 13, 2015	GM107		1870	148	PCIe 3.0 x16	640:40:16	914	1085	5012	14.6	36.6	2048(GDDR5) 4096(DDR3)	80(GDDR5) 32(DDR3)	DDR3 GDDR5	128			1.2^[77]	1.1	1170	36.56	75	No
GeForce GTX 960M^[78]^[79]							640:40:16	1029	1085		16.5	41.2	2048 4096	80	GDDR5						1317	41.16	65
GeForce GTX 965M^[80]^[81]	January 5, 2015	GM204		5200	398		1024:64:32	924	950	5000	30.2	60.4					12.0 (12_1)^[2]^[5]				1945	60.78	60	Yes
GeForce GTX 970M^[82]	October 7, 2014						1280:80:48	924	993	5012	37.0	73.9	3072 6144	120		192					2365	73.9	75
GeForce GTX 980M^[83]							1536:96:64	1038	1127		49.8	99.6	4096 8192	160		256^[84]					3189	99.6	100

1. In OpenCL 3.0, OpenCL 1.2 functionality has become a mandatory baseline, while all OpenCL 2.x and OpenCL 3.0 features were made optional.
2. Shader Processors: Texture mapping units: Render output units
3. A maximum of 2 dual-GPU cards can be connected in tandem for a 4-way SLI configuration as dual-GPU cards feature on-board 2-way SLI.
4. Pixel fillrate is calculated as the lowest of three numbers: number of ROPs multiplied by the base core clock speed, number of rasterizers multiplied by the number of fragments they can generate per rasterizer multiplied by the base core clock speed, and the number of streaming multiprocessors multiplied by the number of fragments per clock that they can output multiplied by the base clock rate.^[25]
5. Texture fillrate is calculated as the number of TMUs multiplied by the base core clock speed.
6. Single precision performance is calculated as 2 times the number of shaders multiplied by the base core clock speed.
7. Double precision performance of the Maxwell chips' are 1/32 of single-precision performance.^[51][52]
8. Lacks hardware video encoder
9. Lacks hardware video encoder and decoder

Chipset table

GeForce 900 (9xx) series

See also: Comparison table of GeForce 900 series

Model	Launch	Code name	Process	Transistors (billion)	Die size (mm^2)	Core config^[a]	Bus interface	L2 Cache (MB)	Clock Speeds			Memory				Fillrate^[b]		Processing power (GFLOPS)^[b]^[c]		TDP (Watts)	SLI support	Release price (USD)
									Base (MHz)	Boost (MHz)	Memory (MT/s)	Size (GB)	Bandwidth (GB/s)	Bus type	Bus width (bit)	Pixel (GP/s)^[d]	Texture (GT/s)^[e]	Single precision	Double precision			MSRP
GeForce GT 945A^[85]^[86]^[87]	February, 2016	GM108	TSMC 28HP	Un­known	Un­known	512:24:8 (4)	PCIe 3.0 x8	?	1072	1176	1800	1 / 2	14.4	DDR3 / GDDR5	64	8.5 9.4	25.7 28.2	1,097.7 1,204.2	34.3 37.6	33	No	OEM
GeForce GTX 950^[88]	August 20, 2015	GM206-250		2.94	227	768:48:32 (6)	PCIe 3.0 x16	1	1024	1188	6600	2	105.7	GDDR5	128	32.7 38.0	49.1 57.0	1,572.8 1,824.7	49.1 57.0	90 (75^[f])	2-way SLI	$159
GeForce GTX 950 (OEM)^[90]	Un­known	GM206				1024:64:32 (8)			935	Un­known	5000		80.0			29.9	59.8	1,914.9 ,	59.8	Un­known		OEM
GeForce GTX 960^[91]	January 22, 2015	GM206-300							1127	1178	7000	2 4^[g]	112.1			36.0 37.6	72.1 75.3	2,308.0 2,412.5	72.1 75.3	120		$199
GeForce GTX 960 (OEM)^[93]	Un­known	GM204		5.2	398	1280:80:48 (10)			924	Un­known	5000	3	120.0		192	44.3	73.9	2,365.4 ,	73.9	Un­known		OEM
GeForce GTX 970^[94]	September 18, 2014	GM204-200				1664:104:56 (13)		1.75	1050	1178	7000	3.5 + 0.5^[h]	196.3 + 28.0^[h]		224 + 32^[h]	58.8 65.9	109.2 122.5	3,494.4 3,920.3	109.2 122.5	145	4-way SLI	$329
GeForce GTX 980^[96]	September 18, 2014	GM204-400				2048:128:64 (16)		2	1126	1216		4	224.3		256	72.0 77.8	144.1 155.6	4,612.0 4,980.7	144.1 155.6	165		$549
GeForce GTX 980 Ti^[97]	June 1, 2015	GM200-310		8	601	2816:176:96 (22)		3	1000	1075		6	336.5		384	96.0 103.2	176.0 189.2	5,632.0 6,054.4	176.0 189.2	250		$649
GeForce GTX TITAN X^[98]	March 17, 2015	GM200-400				3072:192:96 (24)						12					192.0 206.4	6,144.0 6,604.8	192.0 206.4			$999

1. Main shader processors: texture mapping units: render output units (streaming multiprocessors)
2. Base clock, Boost clock
3. To calculate the processing power see Maxwell (microarchitecture)#Performance.
4. Pixel fillrate is calculated as the number of ROPs multiplied by the respective core clock speed.
5. Texture fillrate is calculated as the number of TMUs multiplied by the respective core clock speed.
6. Some GTX950 cards were released without power connector powered only by PCIe slot. These had limited power consumption and TPD to 75W.^[89]
7. Some manufacturers produced 4 GB versions of GTX 960. These were often criticized as useless move, as titles that would use so much VRAM and actually gain advantage over 2 GB versions, would already run too slow on those resolutions and settings, as GTX960 didn't have enough compute power and memory bandwidth to handle it.^[92]
8. For accessing its memory, the GTX 970 stripes data across 7 of its 8 32-bit physical memory lanes, at 196 GB/s. The last 1/8 of its memory (0.5 GB on a 4 GB card) is accessed on a non-interleaved solitary 32-bit connection at 28 GB/s, one seventh the speed of the rest of the memory space. Because this smaller memory pool uses the same connection as the 7th lane to the larger main pool, it contends with accesses to the larger block reducing the effective memory bandwidth not adding to it as an independent connection could.^[95]

Discontinued support

"Driver 368.81 is the last driver to support Windows XP/Windows XP 64-bit".

• Windows XP 32-bit: 368.81 driver download
• Windows XP 64-bit: 368.81 driver download

32-bit drivers for 32-bit operating systems were discontinued after the release of driver 391.35 in March 2018.^[99]

Notebook GPUs based on the Kepler architecture moved to legacy support in April 2019 and stopped receiving critical security updates after April 2020.^[100][101] The Nvidia GeForce 910M and 920M from the 9xxM GPU family are affected by this change.

Nvidia announced that after release of the 470 drivers, it would transition driver support for the Windows 7 and Windows 8.1 operating systems to legacy status and continue to provide critical security updates for these operating systems through September 2024.^[102]

See also

• List of Nvidia graphics processing units
• GeForce 400 series
• GeForce 500 series
• GeForce 600 series
• GeForce 700 series
• GeForce 800M series
• GeForce 10 series
• GeForce 20 series
• GeForce 30 series
• Nvidia Quadro
• Nvidia Tesla

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External links

• The Ultimate GPU, TITAN X. Available Now
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