There is not a AGP card made that is 8X and does not work in a 4X slot. That 1.5V is a misread of the document. No where does AGP slots 'supply' 1.5V but it is true that the AGP card can. 1997年，英特爾推出了首個AGP版本，名為“AGP 1.0規格” ，包括了1倍速（1x）和2倍速（2x）的速度。 之後，又發佈了2.0規格的4倍速（4x）和3.0規格的8倍速（8x）速度的AGP 。.

The Accelerated Graphics Port (also called Advanced Graphics Port) is a high-speed point-to-point channel for attaching a single device (generally a graphics card) to a computers motherboard, primarily to assist in the acceleration of 3D computer graphics. Many classify AGP as a type of computer bus, but this is something of a misnomer since buses generally allow multiple devices to be connected, while AGP does not. AGP originated from Intel, and it was first built into a chipset for the Pentium II microprocessor. AGP cards generally slightly exceed PCI cards in length and can be recognized by a typical hook at the inner end of the connector, which does not exist on PCI cards. Nowdays AGP is almost replaced by PCI-Express.

AGP versions:

• AGP 1.0: 3.3 volts signaling with speed multipliers 1x (267MB/s), 2x (533MB/s)
• AGP 2.0: 1.5 volts signaling with speed multipliers 1x (267MB/s), 2x (533MB/s), 4x (1067MB/s)
• AGP 3.0: 0.8 volts signaling with speed multipliers 4x (1067MB/s), 8x (2133MB/s)

In addition, in the world of workstations different AGP Pro cards exist with extra connectors which allow card to draw more power. In order to make life easier, the AGP standard defines some backward compatibilty. The AGP 1.0 specification requires that all implementations support the 1x speed multiplier at 3.3 volts. By default, when the AGP 1.0 machine powers up it selects the fastest speed multiplier supported by both the video card and the motherboard. If they both support 2x then they will run at 2x. Otherwise they run at 1x which is always implemented by all AGP 1.0 video cards and motherboards. The AGP 2.0 specification has a similar requirement. 2x and 1x support at 1.5 volts are required and 4x support is optional. The AGP 3.0 specification requires support for 8x. The 3.0 specification isn't as clear as the 1.0 and 2.0 specifications on the subject of requiring the lower multiplier but all AGP 3.0 almost all implementations support both 8x and 4x. As a result, you can completely ignore speed multipliers when you're checking for compatibility between an AGP video card and an AGP motherboard. If the video card and motherboard both support the same signaling voltage then there is always at least one common speed multiplier supported by both at that voltage. You only need to make sure that the video card and motherboard have at least one signaling voltage in common.

AGP cards and slots

Slot Agp 1x 2x 4x 8x 2x

*Different slots connectors have different position of key

The AGP connectors on the motherboard are keyed to prevent insertion of AGP cards which would be damaged if plugged in. An AGP 3.3V motherboard connector can only accept AGP cards which have the 3.3V slot. If you try to insert a card without a 3.3V slot into an AGP 3.3V motherboard connector, the card will bump into the connector key and cannot be inserted. Likewise an AGP 1.5V motherboard connector can only accept AGP cards with the 1.5V slot. An AGP universal motherboard connector has no keys and therefore can accept any kind of AGP card. An AGP card with both voltage slots can be plugged into any kind of AGP motherboard connector. If you can plug an AGP card into an AGP motherboard connector, then neither the card nor the motherboard will be damaged (assuming they obey the AGP specifications).

AGP pinout

The AGP bus is 32 bits wide, just the same as PCI is, but instead of running at half the system (memory) bus speed the way PCI does, it runs at full bus speed. This means that on a standard Pentium II motherboard AGP runs at 66 MHz instead of the PCI buss 33 MHz. This of course immediately doubles the bandwidth of the port; instead of the limit of 127.2 MB/s as with PCI, AGP in its lowest speed mode has a bandwidth of 254.3 MB/s. The AGP specification is in fact based on the PCI 2.1 specification, which includes a high-bandwidth 66 MHz speed.

(*This post may contain affiliate links, which means I may receive a small commission if you choose to purchase through links I provide (at no extra cost to you). Thank you for supporting the work I put into this site!)

Slot Agp 1x 2x 4x 8x Slow Motion Jumping In Swimming Pool

AGP or Accelerated Graphics Port was the most popular and common interface for connecting graphics cards on motherboards. It was a high-bandwidth channel and remains on the motherboards for quite a long time. Another interface was PCI but it was a slower channel and not many graphics cards were made for PCI slot in the past.

Generally, AGP came in two variants, first was the AGP 4x which has lower bandwidth and the second one was the AGP 8x which has double the bandwidth of AGP 4x. AGP 4x has a maximum transfer rate of 1066Mb/s whereas AGP 8x has 2133 MB/s. There were also AGP 1x and AGP 2x interfaces but they were very slow and not used that frequently. AGP slot is smaller in size than the PCI and other graphics card interfaces. You won’t see AGP slot in the current generation motherboards because today PCI Express x16 is used for connecting graphics cards which has much higher bandwidth compared to the older AGP graphics card interface.

In older motherboards, you may be able to find AGP slot and if you wish to upgrade the graphics of your older PC then you will need an AGP Graphics Card for it. AGP graphics cards are nearly extinct in production but you can still find some good AGP Graphics Card in the market or online for your older PC or server. To help you out on this, here I am providing you the list of best available AGP graphics cards that you can buy online.

Check out:Best PCI Graphics Cards for Older PCs

Best AGP Video Cards for Older Motherboards

Here are some of the best available AGP video cards for use in AGP slot motherboards. These AGP graphics cards are compatible with both AGP 4x and AGP 8x interface.

Dell Nvidia GeForce4 MX 420 AGP Video Card

This is a very basic and older AGP VGA video card that is based on the Nvidia GeForce4 MX 420 chipset. This is the Genuine Dell Nvidia GeForce4 MX 420 video card and it comes with 64MB memory and VGA & S-Video output. It is a low profile graphics card having is AGP 4x type.

It is passively cooled by a smaller heatsink located on the GPU. The maximum resolution supported by this card is 2048 x 1536 pixels at 75 MHz refresh rate. This card can really prove useful for users who have older computers with AGP slots and need to replace the integrated graphics.

EVGA Geforce FX 5200 128MB DDR AGP Video Card

Slot Agp 1x 2x 4x 8x 5x

Geforce FX 5200 was a very popular entry-level GeForce FX or GeForce 5 series graphics card back in older days. Here we have EVGA Geforce FX 5200 AGP Video Card that comes with 128MB DDR video memory which is more than enough for general tasks. It is also a low profile video card that has got VGA and S-Video display ports.

This is a great card to replace your older PC display or to make it work again. The card is passively cooled with a black heatsink that covers half of the card. This is a DirectX 9 video card and it works with Windows XP / Vista / Windows 7. You might be able to play some of the older games on this card.

EVGA GeForce 6200 512 MB DDR2 AGP 8X Video Card

This is one of the most powerful AGP graphics cards in the list here. Here we have EVGA GeForce 6200 AGP 8X video card that comes with 512 MB DDR2 memory. It is an entry-level or budget Geforce 6 series graphics card and was quite popular back in the older days.

This is not a low profile video card and is passively cooled by a small black heatsink. The card has got one VGA and one DVI port at the back for setting up dual monitors. This card can be used for light gaming, running dual monitors, onboard video replacement and standard tasks. This is a DirectX 9 card and supports AGP 8X. It is compatible with both 32-bit and 64-bit versions of Windows XP, Windows Vista, and Windows 7 operating system. You may get this graphics card under 50 dollars and do check out the link below for its current status. Highly Recommended by me.

VisionTek Radeon 3450 512MB DDR2 AGP 8X Graphics Card

This is the most powerful AGP video card in this list. Here we have VisionTek Radeon 3450 AGP video card that comes with 512MB DDR2 memory. This is a full-sized DirectX 10.1 graphics card that comes with an active cooling solution consisting of heatsink and fan (HSF). Radeon 3450 has got 40 stream processors and supports Shader Model 4.1.

This is an AGP 8X card and comes with both VGA and DVI ports. The card has good HD capabilities and can support dual monitors. You can play some of the older games on this video card. This card should be a great companion for your older PC having an AGP slot. The card does require additional power from the PSU through a 4-pin Molex connector. It supports Windows XP / Vista /7 operating systems.

Slot Agp 1x 2x 4x 8x 4x

Final Words

Well, here I have listed down the best AGP video cards that you can still buy today. You can put them on your AGP motherboard and make your older PC display work again. If you have queries regarding them, then you can ask me by leaving a comment below