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Allocating memory for on-chip AGP video

Trish's Escape from Hardware Hell Help Board » Hardware » Video Related Problems » Allocating memory for on-chip AGP video « Previous Next »

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Posted on Friday, October 5, 2001 - 8:01 pm:   

I just purchased an Elitegroup P6ISA-II motherboard with an integrated Intel AGP 82815 display adapter. According to the manual (poorly written), I have to allocate shared memory using the BIOS, but I see nothing in the CMOS setup that allows me to do this. Has anyone any information about this? It has only allocated 512 MB, and my video performance is suffering for it. I want to allocate at least 16MB. Shared memory means that the display adapter uses whatever part of the main RAM that you allocate to it.
Posted on Friday, October 5, 2001 - 9:53 pm:   

The 810 and 815 use Shared memory architecture but not the same way SiS chipsets do. Intel uses Hub architecture and AGP memory is allocated as needed. The only memory I can see it using (stealing) from main memory is a small chunk of memory,perhaps 1 meg or so for VESA compatability. This allows the user to see the boot process, use DOS, and also allows the Bios to be seen. With SiS chipsets the amount of memory allocated by the user in the BIOS determines video buffer 1 meg, 2 meg, 4 meg, etc. and this block is always used for video. You are probably correct about the poorly written manual as no 810 or 815 chipset motherboard I have setup will allow selecting just how much memory is set aside for video.
Brent Hughes (Brenthughes)
Posted on Friday, October 5, 2001 - 10:41 pm:   

The Award bios for the Elitegroup motherboards uses Unified Memory Architecture which allows main memory to be set aside for video memory. You access the video memory selection under the Integrated Peripherals Options in the set up utility. The last three selections deal with the AGP settings and memory. The default should be 8MB but you should be able to select up to 64MB. I would only go this high if the MB was populated with 512MB of memory. Hope that helps. BTW, the manual (at least on the K7SEM MB)is quite clear on the topic. It is located on pages 47 and 52. Hope that helps.

Posted on Thursday, October 18, 2001 - 9:00 pm:   

K7SEM mainboard uses SiS chipset for AMD processors, allocates a block of memory from main memory and never releases it. Intel 815 chipset uses memory as needed so there probably won't be any settings to allocate a reserved portion of memory for video in the bios. The 810 and 815 Intel graphics capabilities are sub par compared to SiS chipsets who has been using UMA for a very long time. However, if EliteGroup installed an AGP port on the 815 mainboard you have the option of upgrading with either a memory card that can be installed in the AGP port to give the video chipset a buffer, or installing a better AGP card which will disable onboard video automatically.
Brent Hughes (Brenthughes)
Posted on Thursday, October 18, 2001 - 10:11 pm:   

AGP support is usually allowed on boards with on board video and is selected in the Bios settings.
The drawback to this, most notable with the Via chipset is that support is limited to the Nvidia group of video cards. So, anything with the GeForce comparability is fine. Otherwise it's a PCI video card to gain the buffer desired.

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