AGP vs PCI-E 1.0 vs PCI-E 2.0

First of all you should put in more commas and full-stops.
Dude! Difference between AGP and PCI-E is so BIG!
for refrence

PCI 132 MB/s
AGP 8X 2,100 MB/s
PCI Express 1x 250 [500]* MB/s
PCI Express 2x 500 [1000]* MB/s
PCI Express 4x 1000 [2000]* MB/s
PCI Express 8x 2000 [4000]* MB/s
PCI Express 16x 4000 [8000]* MB/s
Anyway, the difference between PCI-E1 and PCI-E2 isn't that big, so don't need to like, upgrade to PCI2 if you got a PCI1 already.

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You pinned it right on. Just one more thing to add to the conversation. AGP isnt Full-Duplex, PCIe is. This was the main reason. whne they both show up i remember testing a AGP8x to PCIe8x and the diference was little to none.
There was never a "solid" AGP SLI for example, just because it wasnt full duplex. In terms of ram power, it was a nice tecnology.It wasnt Half-duplex either because the upstream rate was really really low. So its was dumped for that reason alone.

I saw another review a while ago regarding scaling (and the recent one too). It seems like a 9800GTX, 8800GTX, and 8800Ultra (and possibly the 8800GTS G92 & GT) are the only cards that are really effected in a measurable way with PCIe 8x. Given that AGP 8x is slightly faster than PCIe 8x, no card on that is available for that interface will be limited by it's bus width.

The problem that AGP has is that except for a few ASrock boards you're limited to older single core CPUs (which will impose a bottleneck when paired with, say, a 3850). Additionally, the only powerful DX10 GPU for AGP is the 3850. On top of that it's much more expensive than it's PCIe equivalent.

In short: PCIe is the way to go. If AGP still has support in terms of chipsets and mid-high end cards (nVidia I'm talking about you) it would be worth it. However, the industry has decided (for the most part) to stop supporting it, and therefore an upgrade is inline.

I stand corrected.

Another thing you guys skipped is the power difference between Pci-e 1.x and pci-e 2.0 . The R700 and the gt200 needs power from pci-e 2.0 slot. Forget about agp even a entry level 73gt needs power from the psu because its underfed by the slot alone.