CDROM-Guide forums

Go Back   CDROM-Guide forums > Main Forums > Open to All Computer Related Topics
FAQ Calendar Mark Forums Read
Open   CSec   Data   DevDrv   CoOp   Audio   CDRW   CDG   VCD   DVD   HD DVD   Mac   VGB   PS2   DC   Xbox  

Closed Thread
Thread Tools Display Modes
Old Mar 26, 2003, 02:42 PM
MasterMind MasterMind is offline
Join Date: May 2001
Location: Pune, Maharashtra, India
Posts: 3,219

sponsored links

NP. ASUS P3B-F comes with 2x AGP slot. I am using the same one at this moment. The AGP card you are using is a good one for little above normal performance. Why you want to upgrade it?
Old Mar 26, 2003, 02:56 PM
dfarrales dfarrales is offline
Senior Member
Join Date: May 2000
Posts: 245

well, i don't normally play video games on my pc but i got rid of my ps2 b/c i just wasn't playing it very much. i've been itching to play madden, though, so i decided that i'll just play it on the pc. well, i d/l'd the demo version and the graphic quality isn't great. besides being choppy, there's 'glitches' when views change, referees are missing (the ball just kinda 'floats' from the end of the play to the line of scrimmage ), harsh marks on the field are missing, and few other not-so-bad annoyances. i've heard that it's suppose to look better so i figured that it had to do w/ my vid card. also, if i'm watching a video (specifcally a music video's that you can watch from yahoo) it's very choppy when at full screen.

does all this have to do w/ something else besides the vid card? if i still wanted to replace it, what do you think i can upgrade to for a noticeble difference?

Old Mar 26, 2003, 03:15 PM
ps2wiz ps2wiz is offline
Join Date: Mar 2002
Posts: 1,867

AGP Aperture Size

Common Options : 4, 8, 16, 32, 64, 128, 256


This BIOS feature allows you to select the size of the AGP aperture. The aperture is a portion of the PCI memory address range that is to be dedicated for use as AGP memory address space. Host cycles that hit the aperture range are forwarded to the AGP bus without need for translation. The aperture size also determines the maximum amount of system RAM that can be allocated to the AGP graphics card for texture storage.

The AGP aperture size should be calculated using this formula : maximum usable AGP memory size x 2 plus 12MB. The actual usable AGP memory space is less than half the AGP aperture size set in the BIOS. This is because the AGP controller needs a write combined memory area equal in size to the actual AGP memory area (uncached) plus an additional 12MB for virtual addressing. Therefore, it isn't simply a matter of determining how much AGP memory space you need. You also need to calculate the final aperture size by doubling the amount of AGP memory space desired and adding 12MB to the total.

Note that the AGP aperture is merely address space, not physical memory in use. The physical memory is allocated and released as needed only when Direct3D makes a "create non-local surface" call. Windows 95 (with VGARTD.VXD) and later versions of Microsoft Windows use a waterfall method of memory allocation. Surfaces are first created in the graphics card's local memory. When that memory is full, surface creation spills over into AGP memory and then system memory. So, memory usage is automatically optimized for each application. AGP and system memory are not used unless absolutely necessary.

It is quite common to hear many people recommending that the AGP aperture size should be exactly half the amount of system RAM. However, this is wrong for the same reason why swapfile size shouldn't always be 1/4 of system RAM. Like the swapfile, the requirement for AGP memory space shrinks as the graphics card's local memory increases in size. This is because the graphics card will have more local memory to dedicate to texture storage. This reduces the need for AGP memory. So, if you upgrade to a graphics card with more memory, you shouldn't be "deceived" into thinking that it will therefore require even more AGP memory! On the contrary, a smaller AGP memory space will be required.

If your graphics card has very little graphics memory (4MB - 16MB), you may need to create a large AGP aperture, up to half the size of the system RAM. The graphics card's local memory and the AGP aperture size combined should be roughly around 64MB. For cards with more local memory, you needn't create quite so big an aperture. Note that the size of the aperture does not correspond to performance so increasing it to gargantuan proportions will not improve performance.

Still, it is recommended that you keep the AGP aperture around 64MB to 128MB in size. Now, why is such a large aperture size recommended despite the fact that most graphics cards now come with large amounts of local memory? Shouldn't we just set it to the absolute minimum to save system RAM?

Well, in the first place, many graphics cards require an AGP aperture of at least 16MB in size to work properly. This is probably because the virtual addressing space is already 12MB in size! In addition, many software have AGP aperture size requirements that are mostly unspecified. Some games actually use so much textures that a large AGP aperture is needed even with graphics cards with large memory buffers.

And if you remember the formula above, the AGP aperture must be more than twice the size of the desired AGP memory space. So, if you want 15MB of AGP memory for texture storage purposes, then the AGP aperture has to be at least 42MB in size. Therefore, it makes sense to set a large AGP aperture size in order to cater for all eventualities.

Please note that reducing the AGP aperture size won't save you any RAM. Again, what setting the AGP aperture size does is limit the amount of system memory the AGP bus can appropriate when it needs to. It is not used unless absolutely necessary. So, setting a 64MB AGP aperture doesn't mean that 64MB of your system memory will be appropriated. It will only limit the maximum amount of system memory that can be used by the AGP bus to 64MB (with a usable AGP memory space of only 26MB).

Now, while increasing the AGP aperture size beyond 128MB won't take up system RAM, it would still be best to keep the aperture size in the 64MB-128MB range so that the GART (Graphics Address Relocation Table) won't become too big. As the amount of local memory on graphics cards increases and texture compression becomes commonplace, there's less of a need for the AGP aperture size to grow beyond 64MB. Therefore, it is recommended that you set the AGP Aperture Size to 64MB or at most, 128MB.
Old Mar 26, 2003, 03:28 PM
dfarrales dfarrales is offline
Senior Member
Join Date: May 2000
Posts: 245

wow, that was a mouthful definately helpful in helping me understand what i'm doing. thanks for posting that ps2wiz!

i'd still like to know what i can upgrade my vid card to and if it'll be worth it for what i'm wanting to do.

Old Mar 26, 2003, 04:03 PM
ps2wiz ps2wiz is offline
Join Date: Mar 2002
Posts: 1,867

Well, your 450 Mhz CPU is kinda old, or alteast in my opinion. To play games like Unreal 2003 you need at least 1ghz cpu and a deccent video card. Of which you don't have. However im not saying that you absolutely need to go out and buy a new Comp, the finally decision is of coarse yours.
Old Mar 26, 2003, 04:30 PM
andyr andyr is offline
Join Date: Apr 2000
Location: UK
Posts: 696

It all comes down to what you want your computer for. If you're surfing the net, perhaps playing a few old games and writing a few documents then 450MHz will do you just fine.

I've just put together a computer from old bits I had lying around - Full P2 - 375MHz (actually 333 o/c to 375 on a Intel LX chipset based ASUS board), 64 Meg PC66 SDram (running at 75Mhz), PCI GeForce 2 mx400 (32 Meg), 2x CD Writer (old Sony one) , 3.2Gig HD (ATA 66 - 5400rpm).

Now that's hardly the best computer in the world but all he does is surf the net, writes a CD every now and then, watches a couple of movies, plays mp3's and uses some emulators. The computer does all of that for him without any problems what-so-ever.

If it does what you want it to do then don't worry about it. If it doesn't then upgrade - simple as that.
Closed Thread

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
duplicating burned dc games...HELP!!! bruttner Mac User 4 Sep 12, 2004 06:26 AM
Updating Bios? RPotaczala Open to All Computer Related Topics 17 Dec 13, 2003 08:23 PM
where do u change the video card settings dckicks Open to All Computer Related Topics 1 Nov 17, 2003 05:18 PM
The End Of the PC (BIOS) ps2wiz Open to All Computer Related Topics 21 Mar 05, 2003 06:46 PM
question about matrix limited 256k bios OPTIMUS-CRIME Video Game Backup - Xbox 2 Dec 01, 2002 03:11 PM

All times are GMT -5. The time now is 02:25 PM.

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright 1996-2009 All rights reserved