AGP vs. PCI-E ?

Forum Graphic & Displays : Graphics Cards - AGP vs. PCI-E ?

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Building a new system here, what benefits does the PCI-e format offer over AGP?

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availability of cards.

guess I should rephrase that a little bit... if you are looking at any kind of futureability, PCI-E is the path to go. decent cards come out for this first, and there are more options to choose from. AGP is dying away bit by bit, and newer good cards are becoming scarce. price is not of a concern anymore either, and often times PCI-E beats out the AGP equivalent.

As a format factor goes, video cards still press hard to utilize the PCI-E bus, and suffer little if any penalty on the AGP side. PCI-E is superior, but underutilized as of yet.

Reply to AlaskaFox

They don't make AGP card, if they do, they're usually hard to find nowadays.

PCI-E is the norm now, not to mention all the new, great cards are made for PCI-E.

Reply to prozac26
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PCI-E is generally much more varied as well as cheaper.

Reply to Valtiel
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Thanks folks, btw I was referring to a graphics card...... will go with pci-e

Reply to mokume1

As everyone else has said before me, the PCI-e version of a card is usually cheaper and significantly better performing. Nowadays AGP cards are usually just the PCI-e card with an AGP adapter.

Reply to jeff_2087
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Quote :

As everyone else has said before me, the PCI-e version of a card is usually cheaper and significantly better performing. Nowadays AGP cards are usually just the PCI-e card with an AGP adapter.



and a good 25% more costly....or more!

Reply to blade85
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Technically, I don't know. Some people claim the AGP is not a bottleneck so in terms of performance, there should be none if all other things are the same.

Econmically, go with the PCI-e. Cards comes out sooner, more choices and cheaper.

Reply to kinneer

Yeah it's true that some people say AGP isn't a bottleneck, but just google benchmarks of AGP cards and their equivalent PCI-E. For example.

It's not huge, but it's there.

Reply to jeff_2087
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I think most of the performance loss is due to the fact that most AGP cards aren't true AGP cards but PCI-e cards installed with a bridge chip that adapts it to AGP. The chip makes it slower for some reason...

Reply to Valtiel

Entirely possible, but I figure the reason as to why its slower is irrelevant. Fact is, it's slower.

Reply to jeff_2087
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Quote :

Yeah it's true that some people say AGP isn't a bottleneck, but just google benchmarks of AGP cards and their equivalent PCI-E. For example.

It's not huge, but it's there.



That test uses different motherboards and chipsets though. Not exactly an equal playing field, which will account for a performance difference.

I've done tests on the dual-SATAII motherboard - with native AGP and PCIe support - that show no difference between AGP and PCIe. In fact, AGP seemed to win by a small margin more often than not...

Reply to Cleeve
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Quote :

Entirely possible, but I figure the reason as to why its slower is irrelevant. Fact is, it's slower.



read cleeves post. :wink:


As far as i can tell, the only advantage PCI-e had till now was cost effeciency and the availability to go crossfire/sli

7800GS by nvidia was supposed to be the last agp card according to most people. But looks like the market for AGP is still not dead, and i doubt its gonna die any time soon.

Reply to blade85
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So the question I have always wondered about is, does the AGP interface get bottlenecked with any current cards or is it close to being fully utilized? Or possibly was this just another new technology that we were forced to invest in to keep hardware manufacturers profits rolling? Did we ever really need pci-e?

Reply to jjknoll
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PCIe offers other things than bandwidth... it carries alot more power than the AGP bus.

I don't see a performance difference with current cards, but that doesn't mean it's useless. progress isn't a bad thing.

Reply to Cleeve
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yes it carries more power however cards use so much power now that we need extra power cables anyway. If the agp bandwidth was not close to being bottlenecked then to create another product to say it's progress doesn't seem to be of any benefit to the consumer.

Reply to jjknoll

Quote :

yes it carries more power however cards use so much power now that we need extra power cables anyway. If the agp bandwidth was not close to being bottlenecked then to create another product to say it's progress doesn't seem to be of any benefit to the consumer.



But the bandwidth ceiling is raised meaning that the limit of the bandwidth won't be reached for much longer (better to increase the limit BEFORE you reach it yes?) and PCI-e gives more power meaning less extra power cables needed, AND PCI-e allows for multiple video cards, AND PCI-e will eventually allow for everything in the mobo to be run on one bus (once we get rid of PCI). It is true that the bandwidth bump doesn't really give an advantage to consumers NOW, but PCI-e definitely is a good thing.

Reply to fredgiblet
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good points that I had not thought of thanks for the input.

Reply to jjknoll
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p.s. I never said or meant to imply that pci-e was useless, I just was pointing out that in my flawed opinion that it was more marketing than usefulness.

Reply to jjknoll
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Thanks folks for all the replies folk, you have more than answered my question.
By the way, I already purchased an ATI 1650 Pro card.......PCI-e

Reply to mokume1
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thats a good all purpose card and fairly cheap :wink:

enjoy :)

Reply to blade85
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PCI-E is a marketing term along with everything it offers. No, there is no difference in gain between AGP and PCI-E. Theoretical mombo jumbo means nothing as it is almost never reached. There wasnt a difference between AGP and PCI-E when PCI-E first appeared and there is no difference now(for the consumer).

Reply to tekzor
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thinking more on the lines PCI-e is not just for video cards as thay are norm 8x or 16x slots but there are 1x/2x slots as well for other devices that can mae use of the bandwith as well (network cards/Sata stuff)

PCI is an shared bus PCI-e has its only link for each slot PCI-e bandwith is alot biger then PCI as well (guessing here) 100MB/s vs PCI-e 1x is 256MB/s [512MB/s both ways] and that goes all the way to 16x (1x 2x 4x 8x 16x)

any way think its not an matter should i be thinking of AGP any more as its more or so dead for new video cards and point lesss for some one buying an new video card now and wanting to upgrade later on to an better one as ATI/AMD seem to only one who have made an AGP ver of there video cards

Reply to leexgx
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but nvidia are also gonna be releasing a AGP version of the 79xx series and 8600 series according to some reports

AGP wont die till there is demand....and as far as i can tell, alot of people still have AGP.

Reply to blade85

Maybe they (Nvidia) has learned that there are users out there who would use faster gfx cards if they were there....interesting..


also, I would have to think that with AGP motherboards, most of them are connected to older cpu sockets meaning that the system most likely has an older cpu. Keep in mind that older cpus (like a P4 @2.4ghz... or AMD +2600) bottleneck the gpu making the cpu the weakest link.

ON the contrary, I do believe that there are motherboards out there that support AGP and PCI express. They are supposed to be superior to others though...

Reply to rabidbunny
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yeah and they also support c2d processors

but the pci-e slot is usually 4x rather than 16x so the bandwidth works out at about the same as a 8x agp slot

Reply to blade85
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Quote :

but the pci-e slot is usually 4x rather than 16x so the bandwidth works out at about the same as a 8x agp slot



Wait, what? How did you come up with that? As far as I know the PCI-e slot is definitely supplying full bandwidth (unless in SLI mode on certain motherboards) so I have no idea what you were saying here :?:

Reply to Valtiel
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