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Additional information resources on Core Htpc
GeForce 8 Series - caustic soda solid Manufacturer - caustic soda pearl Manufacturer by xiumi
GeForce 8 Series overview
3D rendering
The GeForce 8 series arrived with NVIDIA's first unified shader Direct3D 10 Shader Model 4.0 / OpenGL 2.1(later drivers have OpenGL 3.2 support) architecture. The design is a major shift for NVIDIA in GPU functionality and capability, the most obvious change being the move from the separate functional units (pixel shaders, vertex shaders) within previous GPUs to a homogeneous collection of universal floating point processors (called "stream processors") that can perform a more universal set of tasks.
Model Adrianne Curry watching a 3D animation of herself during a GeForce 8 demo.
GPU NVIDIA G80.
GeForce 8's unified shader architecture consists of a number of stream processors (SPs). Unlike the vector processing approach taken with older shader units, each SP is scalar and thus can operate only on one component at a time. This makes them less complex to build while still being quite flexible and universal. Scalar shader units also have the advantage of being more efficient in a number of cases as compared to previous generation vector shader units that rely on ideal instruction mixture and ordering to reach peak throughput. The lower maximum throughput of these scalar processors is compensated for by efficiency and by running them at a high clock speed (made possible by their simplicity). GeForce 8 runs the various parts of its core at differing clock speeds (clock domains), similar to the operation of the previous GeForce 7 Series GPUs. For example, the stream processors of GeForce 8800 GTX operate at a 1.35 GHz clock rate while the rest of the chip is operating at 575 MHz.
GeForce 8 performs significantly better texture filtering than its predecessors that used various optimizations and visual tricks to speed up rendering while impairing filtering quality. The GeForce 8 line correctly renders an angle-independent anisotropic filtering algorithm along with full trilinear texture filtering. G80, though not its smaller brethren, is equipped with much more texture filtering arithmetic ability than the GeForce 7 series. This allows high-quality filtering with a much smaller performance hit than previously.
NVIDIA has also introduced new polygon edge anti-aliasing methods, including the ability of the GPU's ROPs to perform both Multisample anti-aliasing (MSAA) and HDR lighting at the same time, correcting various limitations of previous generations. GeForce 8 can perform MSAA with both FP16 and FP32 texture formats. GeForce 8 supports 128-bit HDR rendering, an increase from prior cards' 64-bit support. The chip's new anti-aliasing technology, called coverage sampling AA (CSAA), uses Z, color, and coverage information to determine final pixel color. This technique of color optimization allows 16X CSAA to look crisp and sharp.
The claimed theoretical processing power for the 8 Series cards given in FLOPS may not be correct at all times. For example the GeForce 8800 GTX has 518.43 GigaFLOPs theoretical performance given the fact that there are 128 stream processors at 1.35 GHz with each SP being able to run 1 Multiply-Add and 1 Multiply instruction per clock [(MADD (2 FLOPs) + MUL (1 FLOP))1350 MHz128 SPs 518.4 GigaFLOPs]. This figure may not be correct because the Multiply operation is not always available giving a possibly more accurate performance figure of (21350128) = 345.6 GigaFLOPs.
Max Resolution
Dual Dual-link DVI Support: Able to drive the industry's largest and highest resolution flat-panel displays up to 2560x1600. Available on select GeForce 8800 and 8600 GPUs.
One Dual-link DVI Support: Able to drive the industry's largest and highest resolution flat-panel displays up to 2560x1600. Available on select GeForce 8500 GPUs and GeForce 8400 GS cards based on the G98.
One Single-link DVI Support: Able to drive the industry's largest and highest resolution flat-panel displays up to 1920x1200. Available on select GeForce 8400 GPUs. GeForce 8400 GS cards based on the G86 only support single-link DVI.
Display capabilities
The GeForce 8 series supports 10-bit per channel display output, up from 8-bit on previous NVIDIA cards. This potentially allows higher fidelity color representation and separation on capable displays. The GeForce 8 series, like its recent predecessors, also supports Scalable Link Interface (SLI) for multi-card rendering.
NVIDIA's PureVideo HD video rendering technology is an improved version of the original PureVideo introduced with GeForce 6. It now includes GPU-based hardware acceleration for decoding HD movie formats, post-processing of HD video for enhanced images, and optional High-bandwidth Digital Content Protection (HDCP) support at the card level.
GeForce 8300 and 8400 Series
In the summer of 2007, NVIDIA released the entry level GeForce 8300 and 8400 series of graphics cards. Both series are based on the G86 core and as of December 2007, both series only have a GS version. The GeForce 8300 is also only available in the OEM market, and thus cannot be found in retail outlets. These graphics cards are targeted mainly for those who just need a discrete graphics solution, as the video card performs poorly in intense 3D applications such as high-end video games. It was originally designed to replace the 7200 and 7300 models, but was incapable of doing so due to its poor performance in high-end video games. It's able to play modern games at playable framerates at low settings and low resolutions making it popular among casual gamers and HTPC (Media Center) builders without a PCI Express or AGP motherboard.
At the end of 2007, NVIDIA released a new GeForce 8400 GS based on the G98 (D8M) chip. It is quite different from the G86 used for the "first" 8400 GS, as the G98 features VC-1 and MPEG2 video decoding completely in hardware, lower power consumption, lowered 3D-performance and a smaller fabrication process. The G98 also features dual-link DVI support and PCI Express 2.0. G86 and G98 cards are both sold as "8400 GS", the difference can only be told from technical specifications.
GeForce 8500 and 8600 Series
The neutrality of this section is disputed. Please see the discussion on the talk page. Please do not remove this message until the dispute is resolved. (November 2008)
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Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (November 2008)
On April 17, 2007, NVIDIA released the GeForce 8500 GT, 8600 GT, and 8600 GTS for the mainstream market.
The GeForce 8500 GT isn't considered to be a high-end GPU, and has similar specifications to a GeForce 6600 GT. The 8500 GT is roughly half as fast as the GeForce 8600 GT, which has been considered disappointing and underpowered by many.[citation needed] The main criticism is that the card does not outperform the higher-end cards from the previous GeForce series as well as other mid-ranges cards have in the past. For example, the 8600 GT only averages of approximately twenty percent improvement in framerates of most games over its predecessor, the GeForce 7600 GT. In some games, it can also be slightly slower or on par with the 7600 GT.. It's generally about as fast as a 7800 GT, which in turn doesn't make it faster than a GeForce 7600 GT (or any card of equal range, e.g. the GeForce 6800 Ultra, Radeon X1800 GTO, Radeon X850 XT, Radeon X800 XT, and Radeon X1650 XT).[citation needed] However, because of the 8600 GT's higher number of stream processors and higher shader clocks, it generally performs better than its GeForce 7 predecessors in games that enhance the shaders.
An XFX GeForce 8600 GT
A 8600 GTS is about 15%-40% faster,[clarification needed] and while overall, it's generally on equal grounds with a GeForce 7900 GS (or anything of equal range, e.g. the 256MB GeForce 7800 GTX, a 256MB GeForce 7900 GT, a 256MB Radeon X1800 XT, etc) but, like the 8600 GT, it has an advantage in shader-heavy games for the same reasons, and outguns the 7900 GS in modern games by quite an amount.[clarification needed]
The GeForce 8600 series in particular is hampered by its lack of potential processing power, having only 25% of the full G80 core's stream processors. The series also has a comparatively narrow 128-bit memory bus. Older video cards in the same price range, such as the GeForce 7900 series, featured a 256-bit memory bus. However, the series' lower power requirements of only a 350-watt power supply make it a possible choice for upgrading computers with weaker power supplies. In comparison, the 8800 GT requires a 400-watt power supply.
Also compared with the high end 8800, the midrange 8600 and 8500 are extremely outperformed. However, some GPU mod enthusiasts have been able to push the cards to much higher speeds, in some cases almost double, by modifying the voltage.[citation needed]
NVIDIA introduced one notable feature with the 8500/8600 series: 2nd-generation PureVideo. The first major update to PureVideo since the GeForce 6's launch, 2nd-gen PureVideo offered much improved hardware-decoding for H264 and VC-1 video.
GeForce 8800 Series
EVGA GeForce 8800 GTX
Underside
BFG 8800GTX with the heatsink removed
8800GT with cover removed.
The 8800 series, codenamed G80, was launched on November 8, 2006 with the release of the GeForce 8800 GTX and GTS. A 320 MB GTS was released on February 12 and the Ultra was released on May 2, 2007. The cards are larger than their predecessors, with the 8800 GTX measuring 10.6 in (~26.9 cm) in length and the 8800 GTS measuring 9 in (~23 cm). Both cards have two dual-link DVI connectors and a HDTV/S-Video out connector. The 8800 GTX requires 2 PCIe power inputs to keep within the PCIe standard, while the GTS requires just one.
8800 GS
The 8800 GS is a trimmed-down 8800 GT with 96 stream processors and 384 MB of RAM on a 192-bit bus. In May 2008, it was rebranded as the 9600 GSO in an attempt to spur sales.
On April 28 2008, Apple announced an updated iMac line featuring an 8800 GS. However, the GPU is actually a rebranded NVIDIA GeForce 8800M GTS.[citation needed] It features up to 512 MB of 800 MHz GDDR3 video memory, 64 unified stream processors, a 500 MHz core speed, a 256-bit memory bus width, and a 1250 MHz shader clock.
8800 GTX / 8800 Ultra
The 8800 GTX is equipped with 768 MB GDDR3 RAM. The 8800 series replaced the GeForce 7950 Series as NVIDIA's top-performing consumer GPU. GeForce 8800 GTX and GTS use identical GPU cores, but the GTS model disables parts of the GPU and reduces RAM size and bus width to lower production cost.
As of September 2007[update], the G80 was the largest commercial GPU ever constructed. It consists of 681 million transistors covering a 480 mm die surface area built on a 90 nm process. (In fact the G80's total transistor count is ~686 million, but since the chip was made on a 90 nm process and due to process limitations and yield feasibility, NVIDIA had to break the main design into two chips: Main shader core at 681 million transistors and NV I/O core of about ~5 million transistors making the entire G80 design standing at ~686 million transistors).
A minor manufacturing defect related to a resistor of improper value caused a recall of the 8800 GTX models just two days before the product launch, though the launch itself was unaffected.
The GeForce 8800 GTX was by far the fastest GPU when first released, and 13 months after its initial debut it still remained one of the fastest. The GTX has 128 stream processors clocked at 1.35 GHz, a core clock of 575 MHz, and 768 MB of 384-bit GDDR3 memory at 1.8 GHz, giving it a memory bandwidth of 86.4 GB/s. The card performs faster than a single Radeon HD 2900 XT, and faster than 2 Radeon X1950 XTXs in Crossfire[clarification needed] or 2 GeForce 7900 GTXs in SLI.[clarification needed] The 8800 GTX also supports HDCP, but one major flaw is its older NVIDIA PureVideo processor that uses more CPU resources. Originally retailing for around US$600, prices came down to under US$400 before it was discontinued. The 8800 GTX is also very power hungry, using up to 185 watts of power and requiring two PCI-E power connectors to operate. The 8800 GTX also has 2 SLI connector ports, allowing it to support NVIDIA 3-way SLI for users who run demanding games at extreme resolutions such as 2560x1600.
The 8800 Ultra, retailing at a higher price,[clarification needed] is identical to the GTX architecturally, but features higher clocked shaders, core and memory. Nvidia later[when?] told the media the 8800 Ultra was a new stepping,[clarification needed] creating less heat[clarification needed] therefore clocking higher. Originally retailing from $800 to $1000, most users thought the card to be a poor value, offering only 10% more performance than the GTX but costing hundreds of dollars more. Prices dropped to as low as $500 before being discontinued on January 23, 2008. The core clock of the Ultra runs at 612 MHz, the shaders at 1.5 GHz, and finally the memory at 2.16 GHz, giving the Ultra a theoretical memory bandwidth of 103.7 GB/s. It has 2 SLI connector ports, allowing it to support NVIDIA 3-way SLI. An updated dual slot cooler was also implemented, allowing for quieter and cooler operation at higher clock speeds.
8800 GT
The 8800 GT, codenamed G92, was released on October 29, 2007. The card is the first to transition to 65 nm process, and supports PCI-Express 2.0. It has a single-slot cooler as opposed to the double slot cooler on the 8800 GTS and GTX, and uses less power than GTS and GTX due to its 65 nm process. While its core processing power is comparable to that of the GTX, the 256-bit memory interface and the 512 MB of GDDR3 memory often hinders its performance at very high resolutions and graphics settings. The 8800 GT, unlike other 8800 cards, is equipped with the PureVideo HD VP2 engine for GPU assisted decoding of the H.264 and VC-1 codecs. Performance benchmarks at stock speeds place it above the 8800 GTS (640MB and 320MB versions) and slightly below the 8800 GTX. A 256MB version of the 8800 GT with lower stock memory speeds (1.4 GHz as opposed to 1.8 GHz) but the same core is also available. Performance benchmarks have shown that the 256 MB version of the 8800 GT has a considerable performance disadvantage when compared to its 512 MB counterpart, especially in newer games such as Crysis. Some manufacturers also make models with 1 GB of memory; and with large resolutions and big textures one can perceive a performance difference in the benchmarks. These models are more likely to take up to 2 slots of the computer.
The release of this card presents an odd dynamic to the graphics processing industry. At an NVIDIA projected initial street price of around $200, this card outperforms the ATI flagship HD2900XT and HD3870 in most situations, and even NVIDIA's own 8800 GTS 640mb (previously priced at an MSRP of $400). The card, only marginally slower in synthetic and gaming benchmarks than the 8800 GTX, also takes much of the value away from NVIDIA's own high end card. This release was shortly followed by the (EVGA) 8800 GTS SSC (the original 8800 GTS re-released with 96+ (112) shader processor units), and ATI's counter, the HD 3800 series.
The remaining 8800 GT cards are now being re-branded and sold under the 9800 GT name. (Once stocks of G92 chips run out, 9800 GT will receive a 55 nm chip.)[citation needed]
Compatibility issue with PCI-E 1.0a
Shortly after the release, an incompatibility issue with older PCI Express 1.0a motherboards was unmasked. When using the PCI Express 2.0 compliant 8800 GT or 8800 GTS 512 in some motherboards with PCI Express 1.0a slots, the card would not produce any display image, but the computer would often boot (with the fan on the video card spinning at a constant 100%). The incompatibility is mostly with motherboards with VIA PCI-E 1.0a chipsets.[citation needed]
Some graphics cards had a workaround, which was to re-flash the graphics card's BIOS with an older GEN1 BIOS. However this effectively made it into a PCI Express 1.0 card, not being able to utilize the PCIE 2.0 functions. This could be considered a non-issue however since the card itself could not even utilize the full capacity of the regular PCIE 1.0 slots, there was no noticeable performance reduction. Also flashing of the video card BIOS voided the warranties of most video card manufacturers (if not all) thus making it a less-than-optimum way of getting the card to work properly. A workaround to this is to flash the BIOS of the motherboard to the latest version, which depending on the manufacturer of the motherboard, may contain a fix. In relation to this compatibility issue, the high numbers of cards reported as DOA (as much as 13-15%) were believed to be inaccurate. When it was revealed that the G92 8800 GT and 8800 GTS 512MB were going to be designed with PCI Express 2.0 connections, NVIDIA claimed that all cards would have full backwards-compatibility, but failed to mention that this was only true for PCI Express 1.1 motherboards. The source for the BIOS-flash did not come from NVIDIA or any of their partners, but rather ASRock, a mainboard producer, who mentioned the fix in one of their motherboard FAQs. ASUSTek, sells the 8800 GT with their sticker, posted a newer version of their 8800 GT BIOS on their website, but did not mention that it fixed this issue. EVGA also posted a new bios to fix this issue.
8800 GTS
The first releases of the 8800 GTS line, in November 2006, came in 640 MB and 320 MB configurations of GDDR3 RAM and utilized NVIDIA's G80 GPU. While the 8800 GTX has 128 stream processors and a 384-bit memory bus, these versions of 8800 GTS feature 96 stream processors and a 320-bit bus. With respect to features, however, they are identical because they use the same GPU.
Around the same release date as the 8800 GT, NVIDIA released a new 640 MB of the 8800 GTS. While still based on the 90 nm G80 core, this version has 7 out of the 8 clusters of 16 stream processors enabled (as opposed to 6 out 8 on the older GTSs), giving it a total of 112 stream processors instead of 96. Most other aspects of the card remain unchanged. However, because the only 2 add-in partners who are making this card (BFG and EVGA) have decided to overclock it, this version of the 8800 GTS actually runs slightly faster than a stock GTX in most scenarios, especially at higher resolutions, due to the increased clock speeds.
NVIDIA released a new 8800 GTS 512MB based on the 65 nm G92 GPU on December 10, 2007. This 8800 GTS has 128 stream processors, compared to the 96 processors of the original GTS models. It is equipped with 512 MB GDDR3 on a 256-bit bus. Combined with a 650 MHz core clock and architectural enhancements, this gives the card raw GPU performance exceeding that of 8800 GTX, but it is constrained by the narrower 256-bit memory bus. Its performance can match the 8800 GTX in some situations, and it outperforms the older GTS cards in all situations.
Technical summary
Model
Release Date
Codename
Interface
Fabrication process (nm)
Core clock Reference Model (MHz)
Peak fillrate
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Memory
Texture Units
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Transistor Count (Millions)
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Billion pixel/s
Billion bilinear texel/s
Billion bilinear FP16 texel/s
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