Originally Posted by Asoulintime1982
Ya I know PCI is old and PCI-E is new.
But is it really any better?
I seems to me that they just to an old standard added a few pins and called it new. Kinda like the whole AGP and AGP Pro thing.
I was also looking for what Desktop Card(s) of Nvidias that the ATI X700 Mobility Compared to.
PCI-E is significantly better (faster) than AGP 8x. In terms of raw throughput, PCI-E x16 offers nearly double that of AGP 8x. PCI in its 32-bit/33MHz desktop form transfers data at 133MBps, while the latest AGP 8x design transfers data at 2,133MBps. PCI-E comes in "lanes" marked by the x#. Each PCI-E lane delivers 250MBps. As you can see PCI-E x1 will be almost twice as fast as PCI, and the top end PCI-E x16 delivers 4,000MBps, close to twice as fast as AGP 8x.
Not only is PCI-E faster, it is completly different in design from PCI and AGP. Old PCI and AGP are paralell connections, requiring many many traces on the motherboard. This type of design is sensitive to noise and takes up lots of space. Much like everything today, PCI-E is a serial based interconnect (think of the same type of transformation that PATA to SATA is). It means the lines can transfer data at faster speeds, consuming fewer traces on the motherboard and using less power (All pros for the laptop user). This is why PCI-E connectors are so small in comparison to PCI and AGP (until you start getting into larger x32 sizes).
What many people don't seem to understand is that SOFTWARE does not take advantage of the larger pipes that AGP 8x and now PCI-E x16 offer. Game designers have to make sure the game works for old systems, which means limiting the load on the graphics connection (AGP or PCI-E). Thats why PCI-E based cards and AGP 8x based cards do not seem to differ much, on equal ground otherwise. Granted, all of that is changing.. But still, its why "PCI-E isn't faster than AGP." The actual spec and design of PCI-E is most definately faster than AGP.