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Integrated video - are the address and data buses also shared
Peabody wrote:
But it seems to me that unless they've done a workaround, the biggest slowdown from integrated video is not the shared ram per se, but rather the sharing of the address and data buses with the integrated video controller. In other words, with a separate card, all the refreshing of display output would take place within the card until the main processor changes it, but an integrated video controller is going to be constantly refreshing from the system ram, during which time the CPU can't be using those buses too. I believe this is essentially correct. It is bus contention, not actually RAM size. Integrated graphics aren't a burden when there is separate vidRAM on the mobo (GPU?). Then it just is less upgradeable. -- Robert |
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On 7/22/2005 14:27, Robert Redelmeier wrote:
[...] Integrated graphics aren't a burden when there is separate vidRAM on the mobo (GPU?). Then it just is less upgradeable. Are there non-server motherboards with Intel chipset that have dedicated a dedicated framebuffer? I seem to remember something that you could put in an agp slot that was essentially a "local ram" upgrade for integrated video. ~Jason -- |
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On Mon, 25 Jul 2005 14:16:56 -0400, Jason Gurtz wrote:
On 7/22/2005 14:27, Robert Redelmeier wrote: [...] Integrated graphics aren't a burden when there is separate vidRAM on the mobo (GPU?). Then it just is less upgradeable. Are there non-server motherboards with Intel chipset that have dedicated a dedicated framebuffer? I seem to remember something that you could put in an agp slot that was essentially a "local ram" upgrade for integrated video. There was a thing called an AIMM (AGP Inline Memory Module) which was supposed to plug into an AGP slot. I never saw one and don't recall seeing a mbrd which claimed to support this though... assuming some special support was required?? -- Rgds, George Macdonald |
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George Macdonald wrote:
There was a thing called an AIMM (AGP Inline Memory Module) which was supposed to plug into an AGP slot. I never saw one and don't recall seeing a mbrd which claimed to support this though... assuming some special support was required?? The 810e chip set supported a 4 MB video cache on the motherboard that allowed faster access. I had one of those boards some time back. I couldn't really notice any difference in performance with the cache activated, and the on-board video was pretty bad: fuzzy 2D and pathetic 3D. The 815e chip set supported a video cache with a memory module in the AGP slot, as you indicated. I have an Intel 815EEA2 board that supports this feature. The sales of these memory modules were almost non-existant, but I did buy one made by Kingston some time back on clearance for less than $10. Mine is a 4 MB module labeled "GPA card" which I think stood for "Graphics Performance Adapter" or something like that. Again, it seems to make no difference in video performance. The 2D is ok (less fuzzy than the 810 but still not great) and the 3D is still pathetic (but marginally better than the 810). I still use the system as a file server on my network, with an old video card in the AGP slot. -- Gary L. Reply to the newsgroup only |
#5
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On Mon, 25 Jul 2005 16:29:51 -0400, George Macdonald
wrote: On Mon, 25 Jul 2005 14:16:56 -0400, Jason Gurtz wrote: On 7/22/2005 14:27, Robert Redelmeier wrote: [...] Integrated graphics aren't a burden when there is separate vidRAM on the mobo (GPU?). Then it just is less upgradeable. Are there non-server motherboards with Intel chipset that have dedicated a dedicated framebuffer? I seem to remember something that you could put in an agp slot that was essentially a "local ram" upgrade for integrated video. There was a thing called an AIMM (AGP Inline Memory Module) which was supposed to plug into an AGP slot. I never saw one and don't recall seeing a mbrd which claimed to support this though... assuming some special support was required?? I don't think there was much too special that was required. I saw a few of them in old Compaq Deskpro machines. i810 chipset as I recall, 4MB AIMM card. I don't know that it did much of anything for performance, certainly it wasn't anything you would see without benchmarking. I don't think any of the newer chipsets support this spec anymore. I believe it died after the i815, though I wouldn't swear to the exact date. I've never seen another Intel chipset with local frame buffer memory, though I have seen some from SiS and ATi. I expect that nVidia will have a similar solution in the not-too-distant future as well. ------------- Tony Hill hilla underscore 20 at yahoo dot ca |
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