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AGP is backward compatible from 8x to 2x, but the bus must exactly look like on picture http://en.wikipedia.org/wiki/Accelerated_Graphics_Port#Compatibility, so bus on graphic card must have two grips (3,3V and 1,5V). AGP 8x and AGP 4x is more compatible than AGP 4x and AGP 2x (you can put AGP 4x card to AGP 8x bus and vice versa, but not AGP 4x or 8x graphic to AGP 2x bus and vice versa; result: wrong keyed)
a ge-force FX 5200 or radeon 9200SE? which is better
A picture like that in the PCI article qould be good
http://www.gcsextreme.com/agpfaq.htm gives me a 404 error.
The article does not mention AGP 2.0 nor AGP 3.0.
The article does not talk about compatibility (e.g. can I put an AGP 4x card into an AGP 2x slot?).
The article does not talk about visual identification of AGP cards from the features of the connector.
Kiand 20:58, 9 Nov 2004 (UTC)
I found a very comprehensive link on AGP compatibility, with clear diagrams: http://www.playtool.com/pages/agpcompat/agp.html
In the section titled `Newer Versions of AGP' it is stated that AGP 4X operating at 133MHz double pumped and 8X at 266MHz double pumped. This is incorrect. All AGP modes run at the same frequency, i.e., 66MHz. In 4X 4 32-bit data words are transferred per clock cycle. In 8X 8 32-bit data words are transferred per clock cycle. Note, it is essentially only the AD and CBE busses that are doing this. The PCI derived control signals are still running at the base 66MHz frequency.
The above can be verified by checking the AGP spec which should be available on Intel's web site.
Can someone descripe AGp 1.0, 2.0 3.0?
Also explain AGP multiplier (in BIOS sense).
Any photos of the different AGP connectors would be good.
Rich Farmbrough 16:23, 5 August 2005 (UTC)
The article does not mention that AGP followed the footsteps of Vesa Local Bus (VLB) common on 486 era systems, or that it was first introduced on Socket 7 (second gen. Pentium) and Slot 1 motherboards (early Pentium II systems, IIRC), or that OS support was first introduced in Windows 95 and NT 4.0 (I'm guessing here). MaxEnt 01:44, 9 April 2006 (UTC)
I think I'm going to add this section myself, since I found good refs. MaxEnt 01:44, 9 April 2006 (UTC)
Done. But I'm too pooped to add references. Here are the windows I had open at the end of my search, in addition to what I listed above. Embedded these into a comment within the main page text as well.
MaxEnt 03:23, 9 April 2006 (UTC)
It was kind of disgusting yet pertinent, but then to my shock I discovered an Agpgart page so I moved my Linux-centric footnotes there. MaxEnt 04:30, 9 April 2006 (UTC)
Many AGP 1x cards were merely an existing PCI design reworked to plug into an AGP slot and do not use AGP texturing or any of the other advanced AGP features.
I'm getting a little off topic here, but take a look at this: http://www.pcguide.com/ref/mbsys/cache/char_Cacheability.htm
Around the time that AGP was introduced, the industry was still busy shaving three bits off a tag RAM at a point in time where cheaper memory was by far the most cost effective upgrade for any PC with a graphical desktop. That was the reason I got into the PPro early: fewer cripple bits. People who knew that the early AGP designs didn't help you much ended up buying AGP systems regardless in order to gain other advantages from less crippled chipsets. Some of those Pentium era chipsets (I'm trying very hard not to type cripsets) already had Steve Yzerman's late career knee cartilage the day they were first introduced. MaxEnt 14:14, 20 April 2006 (UTC)
I would like someone to find the max current (amps) that can be delivered through the AGP interface. I see this information varies on web pages. A total wattage would also be benificial.
I'm not sure, but it is at least 19Amps, as there are AGP editions of PCI-e cards that use that much, such as X1950s. Alexander 06:57, 20 August 2007 (UTC)
Noticed someone just made a correction to the idea that a board could possibly support more than one AGP slot.
This was once debated on the linux-kernel list. The two most informative posts were these:
It does appear to be true that there are no known boards with more than one AGP port, but it wasn't fully decided whether it was possible to make such a chipset or not (some voices speculated that it is). MaxEnt 15:07, 1 May 2006 (UTC)
If you guys agree (Stonehead, Imroy) I'll add a section "Dual AGP" and dispel various sources of confusion about this term. I first contributed to this article because I was interested in capturing more of the history of the AGP lifecycle and deployment. Micron's largely unsuccessful efforts to use AGP to sell more DRAM is interesting to me from that perspective. MaxEnt 17:41, 1 May 2006 (UTC)
"AGP is slowly being phased out in favour of PCI Express."
It's actually happening very quickly...
I believe that the current lists look a lot better than lengthy text will look, and are also much more readable. —The preceding unsigned comment was added by 67.165.235.73 ( talk • contribs).
I've come across some information about the asymmetry of bandwidth over AGP. http://www.edn.com/article/CA6351293.html?industryid=2283
This is one aspect of AGP not mentioned here. —The preceding unsigned comment was added by 66.69.192.103 ( talk • contribs) 16:41, 3 December 2006 (UTC).
I warned you, this is very nitpicky. This article states that AGP1x is "A 32-bit channel operating at 66 MHz resulting in a maximum data rate of 266 megabytes per second (MB/s)". However, 4 bytes * 66 MHz does not equal 266 MB/s, but rather 264 MB/s. Is the maximum bandwidth actually 264 MB/s, or is the frequency rounded in the article, or is there something I'm missing? (The official spec is very hard to read.)
Well, since AGP = Accelerated Graphics Port, it is not a Bus like PCI so the phrase "AGP bus" all over the article is basically wrong. Why does it matter? Because acceleration was one of the reasons for moving from bus (shared resource among many devices) to port (dedicated point-to-point connection between graphic card and the CPU). Cheers! 212.25.124.154 14:26, 20 February 2007 (UTC)Yoad Snapir.
hi,
thought this might help develop this wiki page - I am no expert in video graphic cards - but I thought this might help - it explains the difference in AGP version 2.0 and 3.0
In layman's terms AGP 2.0 is AGP 2x and AGP 4x. While AGP 3.0 is an AGP 8x or 4x.
[3] —Preceding unsigned comment added by Krisketapetatum ( talk • contribs) 03:53, 12 October 2007 (UTC)
The image http://en.wikipedia.org/wiki/Image:AGP_%26_AGP_Pro_Keying.svg should be updated with the slots aligned in such a way showing that AGP Pro is a slot longer than AGP in both direction, not just in the right direction.
It is currently showing all slots aligned left. -- Gafex ( talk) 08:31, 16 July 2008 (UTC)
I suggest the AGP pro slots to be moved in left and alligned right toward above AGP slots. In this way, we can more easily compare 3.3V key and 1.5V key and I'll like the locations of this keys to be alligned in same vertical lines like the slot. If the drawn video card is moved vertically down, it'll no fit in AGP pro slots, because they're misplaced in right. I'll also like the captions to be moved in right of the slots. Here is sample:
®®®®®® AGP
®®®®®®®®®®®®®® AGP pro
I think that after is shown videocard and above slots are alligned in correct way, the rest slots have to be alligned too or someone to post comment here and to explain that I'm wrongly thinking. I boldly require answer, because above coment from another wikipedia user is not answered so long time and this diagram is confusing and misleading for me in current way.
The newer ATI Radeon HD 4670 will be available as AGP, apparently, http://arstechnica.com/news.ars/post/20080910-ati-launches-new-hd-4000-series-at-sub-100-prices.html 150.237.47.14 ( talk) 14:47, 9 October 2008 (UTC)
it is with a pci-express bridge chip though Markthemac ( talk) 05:25, 16 May 2009 (UTC)
http://www.techfresh.net/his-agp-based-radeon-hd-4670-iceq/ && http://www.techpowerup.com/95987/PowerColor_launches_HD_4670_AGP_Passive_HD_4770_and_more_ATI_cards.html 88.104.2.141 ( talk) 13:25, 1 August 2009 (UTC)
Is this a misprint: the HP AlphaServer GS1280 has up to 64 AGP slots? Why would any computer need 64 video outputs? Danceswithzerglings ( talk)
Some laptops come with an "AGP" port (eg. Dell Inspiron 8100) but this is obviously incompatible with desktop AGP. Does this special port have a specific name? How dies it differ electrically from the desktop version? 2fort5r ( talk) 19:27, 12 July 2009 (UTC)
No, the Inspiron 8100 laptop has a removable graphics card, which uses a completely different port to desktop AGP. So I assume "AGP" refers to a set of electrical protocols rather than to the physical connector? 2fort5r ( talk) 18:23, 13 July 2009 (UTC)
"point-to-point"? nonsense. Load a non-plug and play OS like DOS (or FreeDOS or DRDOS). Load a debugger. Motherboard BIOS is in control. "Peek" the PCI I/O memory above 0xC000, you will see the AGP card off a PCI Bridge off the main PCI bus.
Original AGP cards were 5 volt powered, hence the 3.3 volt "key" towards the front of the card. original TTL logic levels were .4-2.8 V out, .8 -2.0 V in with logic threshold 1.4 volt. Original 5V CMOS was .5-4.5 out with 2.5 v threshold. Updated 5V TTL (S, LS) and CMOS (HCT) logic levels were .4-3.5 out. 3.3V CMOS input thresholds were 1.5 V. Most newer chipsets are powered by 3.3 V or (even 1.8 V to reduce power usage) and would be tolerant of 5V (i/o) powered chips signal levels (original Intel i440LX AGP chipset).
Should be noted that some motherboard came with a tape blocking the AGP slot saying '.8 volt only' or "damage will result to the motherboard".
Multiple Video Card problem is a BIOS issue. DOS accessed video through processor interrupts using legacy i/o and memory addresses. Legacy I/O addresses: 3B0-3BB Mono display/printer adapter, 3BC-3BF LPT, C0-3CF EGA/VGA adapter, 3D0-3DF CGA/EGA/VGA adapter. Legacy Memory addresses: 0xA0000 - 0xAFFFF VGA, EGA; xB0000 - 0xBFFFF Mono, CGA, VGA, EGA; 0xC0000 - 0xC7FFF Video BIOS ROM. In protected mode, most newer software accesses the video card in PCI extended I/O and Memory Addresses (above physical RAM addresses). The Motherboard disables the duplicate legacy addresses on all secondary cards to avoid the consequences of short-circuited chips. Video cards that require the Video BIOS ROM to be active will not work as secondary cards. Several computers I have been using (especially EFI BIOS based systems) have some or all of these legacy addresses missing. I have a laptop that will boot to a USB to Video adapter (per usb video standard support in bios, although not Microsoft supported per http://www.microsoft.com/whdc ).
windows 95 and windows 98 vga.txt files list multiple card issues, could be referenced since multiple video adapters are in part OS specific. http://flammingfiles.tripod.com/files/biosdl.pdf http://www.playtool.com/pages/agpcompat/agp.html http://www.directron.com/15agpguide.html http://www.manualshark.org/manualshark/files/28/pdf_29582.pdf HP Vectra manual http://www.onlinecomputerbooks.com/blog/free-book-upgrading-and-repairing-pcs-16th-edition/ apparently free version
Shjacks45 ( talk) 00:09, 12 April 2010 (UTC)
How much power does an AGP-slot provide?-- 78.48.205.180 ( talk) 16:05, 10 March 2011 (UTC)
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It was high speed, now it is not. But it still exists, so the lede should remain in present tense. "is a formerly high speed" feels... judgy. Just take "high speed" out? - Immigrant laborer ( talk) 17:26, 30 May 2018 (UTC)