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CrossFire Limitations...? - 2005/09/16 15:18
Well seems that CrossFire will have his limits... Someone suggested we look at the SiI 1161 chip capabilities and we discovered what appear to be a major limitation of ATI's CrossFire concept. You all know by now that ATI needs a Master card with a special PCB and a SiI 1161 chip to gather the signal from a Slave card. The Slave card is any X850 or X800 unit that you can already buy. This Silicon Image SiI 1161 chip is gathering both signals as sending it to your display.
It turns out that this chip works at 165MHz and if you do some very complex maths you can find out that this chip can support 1600x1200 resolution at maximal 60Hz. By any standards 60Hz is not enough for a good refresh rate on a CRT while it's enough for LCDs due to its different way of working. We also learned that this chip will be able to do 1280x1024 at 85Hz. We discovered that for 1600x1200 at 75Hz you need at least 202.5MHz clocked chip while for 1600x1200 at 85Hz you need the chip that works at 229.5MHz...
CrossFire limited to 1600x1200 at 60Hz...
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EVGA GTX295 PCIe 1792MB - Rev 01
