AGP vs PCI Video Cards

B

BballSteve

New Member
What are the main differences between these 2?

I'm looking at a new mobo, but it has no AGP slot. This concerns me because I have an AGP video card, and don't feel like getting another one unless PCI is better. So please, enlighten me lol Thanks.
 
Okay, I'll look into PCI Express or AGP now, but are one of the kinds better for gaming. Because thats mostly what I do is game.
 
PCI-E is the latest motherboard GPU slot. Although not even AGP slots have been used to their fullest, manufacturers are mass producing PCI-E cards and you will have a larger selection of GPU's to choose from.
 
AGP is being phased out, if investing in a new motherboard make sure it has a PCI-E slot (most modern boards worth considering has one).
 
Has anyone ever found a good comparison of PCIe and AGP? I know back around 1999 or so, I had a Voodoo3 3000 and it actually did as well or BETTER than the AGP version. Think I'm crazy? Look around the web... I found the review I saw many years ago.
 
The_Other_One... I know you're one of the most formidable people on this forum, but doesn't PCI only have a 33.3 mb/s transfer speed? I'm not sure what the i/o rate of AGP is, but I'm pretty damn sure that PCI doesn't even come close to AGP!

Correct if I'm wrong... and if I am don't put me down too hard:)
 
Mode
Clock
Number of bits
Data per clock cycle << Follow this routine to find the i/o
Transfer Rate

x1 AGP
66 MHz
32 bits
1
266 MB/s

x2 AGP
66 MHz
32 bits
2
533 MB/s

x4 AGP
66 MHz
32 bits
4
1,066 MB/s

x8 AGP
66 MHz
32 bits
8
2,133 MB/s




Bus
Clock
Number of bits
Data per Clock Cycle
Maximum Transfer Rate

PCI
33 MHz
32
1
133 MB/s

PCI
66 MHz
32
1
266 MB/s

PCI
33 MHz
64
1
266 MB/s

PCI
66 MHz
64
1
533 MB/s



Not sure if I'm right or not, but I guess I should post this and then read it:D
 
i.Angel said:
The_Other_One... I know you're one of the most formidable people on this forum, but doesn't PCI only have a 33.3 mb/s transfer speed? I'm not sure what the i/o rate of AGP is, but I'm pretty damn sure that PCI doesn't even come close to AGP!
Click to expand...
Older cards like the Voodoo3 won't get to 33.3mb/s, so higher bandwidth is pointless for these cards.

Has anyone ever found a good comparison of PCIe and AGP? I know back around 1999 or so, I had a Voodoo3 3000 and it actually did as well or BETTER than the AGP version. Think I'm crazy? Look around the web... I found the review I saw many years ago.
Click to expand...
That's quite normal when new slots come out. The early PCI-E cards were easily outperformed by their AGP versions. I don't think that the difference is too significant at the moment, although with some cards, like the 6800GS, the PCI-E version has higher clocks.

I, too, would like to see a comparison between otherwise identical APG and PCI-E cards, though. Anyone seen any?
 
ceewi1 said:
Interesting result, given that the 6800GT is a native-AGP card with an HSI bride, and not a native PCI-E card. Everything i've seen comparing the AGP and PCI-E version of that card has shown no significant difference, I wonder if the test system used could have been responsible for the difference.
Click to expand...
thats what i was thinking, im not sure how they get the results. Im thinking that they have people run them at home, and then report it to them, and people with the PCI-e system most likely have a better cpu and better ram.
 
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