Whats the diffrence between pci express 2.0 and 3.0

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niume123

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Sep 30, 2017
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As the title says .

So i have motherboard which writen pci express 2.0 and it has 8 holes to put it in i have three cables coming from psu two of them has pci e written one has 6 holes other one 8 holes and the last one just have 8 holes so which one to plug?

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Solution
BFG-9000
Do NOT plug any cable that says PCIe on it into any motherboard. Its +12v and ground wires are wired backwards from the 8-pin cable for the motherboard that may say CPU, ATX or EPS12v on it. If you do manage to plug the PCIe cable into the motherboard (it's keyed to prevent it but people can be persistent) and power it up, everything will be destroyed.

To answer your question, PCIe 3.0 is 3 years newer, and ~8GB/s faster than PCIe 2.0 for a x16 slot. It's backwards compatible so PCIe 3.0 cards work in PCIe 2.0 slots just fine with less than 2% performance loss for the fastest cards (because it's ridiculously faster than it needs to be, AND you should always have enough local VRAM to not go into PCIe transfers anyway). And while...
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BFG-9000

BFG-9000

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Sep 17, 2016
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Do NOT plug any cable that says PCIe on it into any motherboard. Its +12v and ground wires are wired backwards from the 8-pin cable for the motherboard that may say CPU, ATX or EPS12v on it. If you do manage to plug the PCIe cable into the motherboard (it's keyed to prevent it but people can be persistent) and power it up, everything will be destroyed.

To answer your question, PCIe 3.0 is 3 years newer, and ~8GB/s faster than PCIe 2.0 for a x16 slot. It's backwards compatible so PCIe 3.0 cards work in PCIe 2.0 slots just fine with less than 2% performance loss for the fastest cards (because it's ridiculously faster than it needs to be, AND you should always have enough local VRAM to not go into PCIe transfers anyway). And while PCIe 2.0 only specs 100w for the 8-pin connector instead of 150w for later versions, this is mostly a power supply issue and nobody sells PSUs for a particular PCIe version.
 
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