SLI and CrossFire bridge efficiency

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POSTER: pc hardware news   ||   SLI AND CROSSFIRE BRIDGE EFFICIENCY	DATE:2006-09-19
The need to use of  special interfaces  to exchange data between video card in  bonds SLI and CrossFire was for a long time question by separate users. With  less degree this affected the supporters of technology SLI: they simply would want to use in  those video card, which don't come with special interface MIO for connection “bridge” . This possibility for  video card, with lower price segment  - data were transferred by the interface PCI  express  x16, the cooworking of two video chip was  done via drivers, as before. now  in the bond SLI it s possible even with weak video card of  type  geForce 7100 GS. video card  radeon x1650 XT moreover was prepared for  announcement by the cost of $149-179 and will uwork in  regime  crossFire using the special interface, by which will be transmitted data. Thus ATI already said, that  to transmit data between video card it is better through the certain apparatus interface. Associates decided to test, the loss of efficiency  using the SLI- bridges and coupling cable  crossFire-dongle in the systems on  base of video card  on the average level: GeForce 7900 GT Radeon  x1900 GT. in the experiment they compared the systems operating speed   with the transfer of  the given  apparatus interfaces with the indices regimes, which imply to the failure using these interfaces. In  case with video card  radeon  x1900 GT in the role of master- map came out Radeon  x1900  crossFire  edition: being united with Radeon  x1900 GT, with 256mb disconnected memory and four pixel shader, keeping constants only its   frequencies. The pair of video card  radeon  x1900 GT without the master- map  exchanged data on the interface PCI  express  x16. System with the support SLI in the course of experiment had  only  the use of   connecting bridge. The loss of efficiency in  percentages with the failure apparatus interfaces is shown on the diagram. The lower the better. From three tested games most of all suffered Quake 4. Possibly, this is somehow connected with the game API (OpenGL), or  problems with the  drivers optimization  . One way or other, a loss of efficiency by 30% - 40% occurs both in the case with SLI and CrossFire. Similarly reaction with the game  far  cry, losing upto 24% of performance. In the game  splinter  cell the losses  crossFire was insignificant - it is a little more than 2% at the worst case. SLI loses from  15-18%; therefore it is better to take care with SLI- bridge. Different games use different regimes (AFR, SFR, SuperTiling), this also affects the value with  efficiency loss  . If in one case the loss of efficiency is negligibly small, in other it can seem be bigger. It should be noted  for  owners of video card  type  radeon  x1900 GT on the weights of selection occurs the price question. Master- map is not only  sufficiently rare and expensive , paired with weaker video card it still  loses a certain performance part  (reducing the memory capacity and the number of pixel pipeline). Are there sense to overpay for these  advantages? However,  during October will enter another concept Of crossFire - special master- maps will not be required, the connection between the united graphic board will be achieved on the special interface of  type  MIO. Naturally, both video card in this case must relate to the new family, and the owners of   previous generation video card  will not get such advantage. Related Products :

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