VOGONS


First post, by tanasen

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I have a serious question: Does an AGP4x graphics card underperform mathematically to 50% lower performance when being used on an AGP2x motherboard? e.g. I have a geforce2ti and tested it on a P4 system with agp8x and on my P3 system with agp2x and performance in almost every game and benchmark is cut in half. (I think in openGL it is a bit better). Is this due to the lower bandwidth of the agp2x slot?

PC1😜 III-S 1.4GHz, GA-6VTXE, 512MB SDRAM, Albatron FX5900XTV 128MB, SB Live! 5.1
PC2😜 III 800MHz, MS-6178, 256MB SDRAM, 3DFX Voodoo3 2000 PCI, Creative CT4810
PC3😜 MMX 200MHz, SY-5EAS5, 128MB SDRAM, Diamond Monster 3D, Diamond Viper V330, ESS 1868F

Reply 2 of 3, by Katmai500

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No. The AGP speed just sets the maximum bandwidth available for the graphics card to communicate with the CPU, chipset, system RAM, etc. In most cases the GPU doesn't need this maximum bandwidth. So if you run a 4x card at 2x, there may be some loss of performance in particular situations, but not an overall 50% drop. You're mostly seeing the difference in CPU/memory performance between the P3 and P4.

Reply 3 of 3, by tanasen

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Ok that's good to know. Seems reasonable too, cause we are talking about a Northwood HT 3.0ghz 800MHz FSB and a Coppermine 1.0GHz 133MHz FSB

PC1😜 III-S 1.4GHz, GA-6VTXE, 512MB SDRAM, Albatron FX5900XTV 128MB, SB Live! 5.1
PC2😜 III 800MHz, MS-6178, 256MB SDRAM, 3DFX Voodoo3 2000 PCI, Creative CT4810
PC3😜 MMX 200MHz, SY-5EAS5, 128MB SDRAM, Diamond Monster 3D, Diamond Viper V330, ESS 1868F