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[url=http://www.anandtech.com/chipsets/showdoc.html?i=1623&p=2]Anandtech over AGPx8[/url] [quote:39195feaf6]As we've explained in our recent graphics articles, before a GPU can start rendering pixels it must be fed raw data from the scene in the form of vertices. These vertices are passed on to the GPU over the AGP bus. In the past and even in current games, AGP performance isn't really a limitation since today's games make relatively limited use of polygons and are much more texture intensive. As more polygons are used in games, the sheer amount of vertex data being sent to the GPU over the AGP bus will increase and thus a higher bandwidth AGP bus may become necessary. How much extra bandwidth does AGP 8X provide? The AGP 3.0 specification defines that a total of 8 transfers are made on every clock cycle with a frequency of 66MHz. Since the bus is still 32-bits wide this doubles the bandwidth of AGP 4X (1.06GB/s) to 2.1GB/s. Unfortunately the reference board VIA sent out for testing would not even post with an AGP 8X card installed. We used the SiS Xabre 400 card and the board would not POST. We tried the same AGP 8X card in other AGP 4X boards and it worked fine. This may just be an implementation thing with VIA counting on not having to deal with it until AGP 8X cards start hitting the market in larger quantities. We got confirmation from SiS that the Xabre 400 works fine in forthcoming AMD and Intel AGP 8X chipsets [/quote:39195feaf6] Jammer dat die Pentium 4 plank van VIA niet wou draaien op AGPx8 met die sis Xabre
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Via over de KT400 (met AGPx8) [quote:5cd4dbe0b8]The system builder also said that Via had confirmed that it was likely to launch a P4X600 chipset sometime this summer, but that it was holding pack on releasing its [b:5cd4dbe0b8]KT400 chipset [/b:5cd4dbe0b8]which supports 400MHz double data rate (DDR) memory. That, he told the INQ, was because Via felt it was important not to cause confusion in the market, although likely such chipsets are underway and will be released late Q3 or in Q4 of this year. The KT400, however, is already sampling.[/quote:5cd4dbe0b8] dat is klote... dan word het dus toch de Sis746 die AGPx8 gaat brengen
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OK AGP test volbracht Settings: GeForce 4 ti 4400 @ 300/620 DetenatorXP 29.40 drivers AGP Sidband addressing: On AGP fast Write: Off FSAA & Aniso: off Codecreatures Benchmark 1024x768 test: [i:8075f89bad][color=red:8075f89bad][b:8075f89bad]AGPx2[/b:8075f89bad][/color:8075f89bad] Avarage FPS: 26,1 Max FPS: 39 Avarage Poly/sec: 9,2 Miljoen Max Poly/sec: 13,3 Miljoen Total frames: 3423 [color=red:8075f89bad][b:8075f89bad]AGPx4[/b:8075f89bad][/color:8075f89bad] Avarage FPS: 26,9 Max FPS: 39 Avarage Poly/sec: 9,4 Miljoen Max Poly/sec: 13,3 Miljoen Total frames: 3531[/i:8075f89bad] Erg weinig verschil dus. en alleen in het gemiddelde is wat gestegen. Toch denk ik dat AGPx8 weer een fps scheelt.
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Even zelf wat tests gedaan in 3Dmark: AGP 4x : 8771 AGP 2x : 8731 AGP 0x : 7805 AGP 0x heb gedaan door Aperture size op 4 MB te zetten, en AGP op 1x. Volgens mij moet hij dan in PCI mode draaien. In DX uitzetten hielp niet. Conclusie AGP helpt dus wel, maar de snelheid van de AGP poort zelf maakt niet zo veel uit op dit moment.
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