2016년 11월 2일 수요일

CrossFireX

CrossFireX

AMD CrossFireX Logo.svg

CrossFireX (cross fire X) is the multi-GPU technology which ATI Technologies (existing AMD) developed. I plurally insert a CrossFireX-adaptive graphics card (video card, video board, graphics board, graphics chip) on the same motherboard and connect them electrically. By parallel computation by several GPU, I can expect large improvement of the processing capacity. Not only a motherboard equipped with a chipset made in AMD, it may be said that the point that even a motherboard equipped with a chipset made in Intel can build is a big characteristic.

It becomes CrossFireX which is available for parallel movement now in up to four GPU (as for the dual GPU card of the GPU2 unit deployment, accessible to the again normal single GPU card to four pieces to two pieces).

Table of contents

Generation

  • CrossFire (the first generation) - September 27, 2005 [1]
  • Software CrossFire (the second generation)
  • CrossFireX (the third generation) - September 19, 2007

Connection method

At first I need a motherboard having the expansion slot which I can only insert several of graphics cards and them in and the latest device driver and, in constitution of the multi-GPU environment by CrossFire, must be all a thing corresponding to CrossFire.

Procedure

  1. I prepare a motherboard equipped with a CrossFire-adaptive chipset and two graphics cards of the same model corresponding to CrossFire (or more than two).
  2. According to a manual, I connect a graphics card to PCI Express connector and connect each card with a bridge cable (Native CrossFire). I perform connection (mostly I connect "CrossFire Edition" to one near a CPU) of both to PCI Express connector according to a manual and, in the case of a model released before 1950XTX, turn on an exclusive output cord.
  3. I start a PC and validate CrossFire setting in utility software "AMD Catalyst".

Construction is possible, but, as for the Radeon 1000 series released before it, structure is complicated, and, as for Radeon 2000, HD 3000, HD 4000, the HD 5000 series, it is necessary to prepare for a model (e.g.,: in "RadeonX1900 CrossFire Edition" "RadeonX1900XTX/XT/PRO") same as thing (I may call this "a master" or "a master board") and it of "CrossFire Edition" if I prepare the same model. In addition, the lineup called "CrossFire Edition" did not exist after 2007 and was unified by a lineup that it supported ATI CrossFire or ATI CrossFireX.

In addition, in Radeon R9 290X, XDMA where the connection with the bridge cable becomes needless is implemented [2].

Characteristic

  • Because the CrossFire standard is made open, it is made in ATI and can build even product made in other companies chip set such as not only the motherboard mounted with a chipset made in AMD but also Intel. If it is Intel, after intel P965 Express, I can build it if it is a motherboard equipped with PCI Express *16 slot more than two (975X, P35, P45, P55, H55, H57, X58). It is said that I have the superiority over the third party including Intel which is a rival on competition with NVIDIA as a reason throwing the CrossFire architecture open [the source required]. On the other hand, NVIDIA refused the SLI correspondence with the motherboard which was not equipped with a chipset (tip such as the PCI Express switch made in or NVIDIA) made in the company, but announced that I provided a license of SLI in a part of the chip set "AMD 9" series in the next term of AMD in April, 2011 in intel X58 chip set in August, 2009 [3]. It is a part, but "the limit by the difference in platform chip set" will be in this way taken away by CrossFire, SLI.
  • Because all GPU is the PCI Express connection from a northbridge, a bottleneck is hard to occur.
  • It is difficult to increase the number of PCI Express lanes, and there are many things changing number of the lanes 8 with two. In correspondence with CrossFire, number of the lanes 16 includes ATI CrossFire Xpress 3200, AMD 790FX, intel X38, X48, X58 to two things.
  • "The rendering of the alternation frame" and "rendering of top and bottom or the right and left division" are common in the multi-GPU environment, but I divide 32 pixels of whole into a block of every direction in CrossFire, and method "SuperTiling mode" [4] doing rendering (to put it simply, rendering doing the part between white trouts of a field of the chess namely the checkerboard or black trouts at a time) supports the block of one tobashi.
  • Because mirroring of the memory is performed in CrossFire (CrossFireX), as for the available memory gross weight, it is really 4GB or thereunder by application even if, for example, I use two pieces of cards equipped with a 4GB graphics memory without it being to 8GB of 4GB *2.
  • When I perform GPGPU distributed processing using OpenCL in AMD multi-GPU environment, it is recommended that I turn off CrossFire (CrossFireX) [5].

In addition, confirmation is necessary for the specifications such as total electricity, 12V1, 12V2 of the power supply unit on the occasion of enlargement. There is the risk such as the motherboard damage, and attention is necessary in one [the source required] of when I make CrossFire constitution with a power supply unit of inferior quality when it is the worst.

Derivation standard

Hybrid CrossFire (Hybrid CrossFireX)

A technique [6] to let GPU on the graphics card and GPU with a built-in AMD chipset cost parallel computation [7] [8].

  • Correspondence graphics card
    • Radeon HD 2400 PRO/XT
    • Radeon HD 3450
    • Radeon HD 3470
  • Correspondence chip set
    • AMD 790GX
    • AMD 780G
    • AMD 760G
    • AMD 785G
    • AMD 880G
    • AMD 890GX

AMD Dual Graphics

A succeeding standard of Hybrid CrossFireX. Parallel computation of different GPU of the number of シェーダー (the number of the stream processors) was enabled.

  • Correspondence chip set
    • AMD 890GX
  • Correspondence graphics card
    • Radeon HD 5450
  • Correspondence APU [9] [10]
    • AMD A4, A6, A8, A10
  • A correspondence graphics card [9] [10]
    • Radeon HD 6450, HD 6570, HD 6670

Allied item

Footnote

  1. ^ "ATI Launches Crossfire... Finally". Slashdot (September 26, 2005). December 28, 2009 reading.
  2. ^ "AMD Radeon R9 290X" thorough inspection! The details of "Radeon R9 290X" where (1) which investigated ability of new generation high-end Radeon became apparent to at last | My navigator news
  3. Enlarge a license of offer SLI for ^ NVIDIA, next chip set of AMD in SLI, and SLI is available in AMD 990FX/990X/970; PC online April 29, 2011
  4. ^ [4Gamer.net] 3D gaming ecstasy of - Nishikawa Yoshiji: I press a secret of dual tip solution to ATI "CrossFire"
  5. ^ Frequently Asked Questions AMD OpenCL™Coding Competition: OpenCL Questions: 26. Does the AMD APP SDK v2.4 with OpenCL 1.1 support work on multiple GPUs (ATI CrossFire)?
  6. ^ It is demonstration - Engadget Japanese in AMD, hybrid CrossFire of built-in + attaching externally GPU
  7. ^ Layout 1 - 45689-A-ATI-Hybrid-Gfx-Brochure.pdf
  8. ^ News - effect is preeminence, Hybrid CrossFireX of AMD 780G: ITpro
  9. ^ a b http://www.amd.com/us/products/technologies/dual-graphics/Pages/dual-graphics.aspx#3[ questionable point – Notebook]
  10. ^ a b ASCII.jp: You should utilize AMD Dual Graphics if you make a game PC cheaply! (1/3)

Outside link

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