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Intel pentium, i3 series with pcie 3.0

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January 18, 2013 8:26:37 PM

i just wondering about pci-e 3.0 that has came with mobo and gpu... wheres the mobo said,,, that pcie 3.0 support by i5 and 17 3xxx series....
and what's gonna happen when i stick pentium/ celeron/ i3 cpu..
January 18, 2013 8:31:00 PM

This is true, if you use a Pentium/Celeron/i3, it'll use the slot but at PCI-e 3.0 8x, better known as PCI-e 2.0 16x.
Hope this helped!
January 18, 2013 8:50:59 PM

payturr said:
This is true, if you use a Pentium/Celeron/i3, it'll use the slot but at PCI-e 3.0 8x, better known as PCI-e 2.0 16x.

PCIe 3.0 @ x8 is not "better known" as PCIe 2.0 @ x16, they are two different things and just happen to have roughly similar usable bandwidth.

PCIe 3.0 lanes run at 8Gbps each (x8 = 64Gbps) while PCIe 2.0/2.1 lanes run at 5Gbps each (x16 = 80Gbps) and the card will run with as many lanes enabled as are available on the slot at whatever the highest speed both endpoints support.

Since the Pentium/i3 only support PCIe 2.1 and the motherboard likely supports x16, the board should be running PCIe 2.1 x16.

The only common case where a GPU may end up running whatever version of PCIe at x8 or x4 instead of x16 is for SLI/CFX where the 16-lanes GPU bus may get split between two x8 slots or a mix of x4 and x8. Some (very) high-end motherboards (~$600) have PCIe switches that allow running as many as four cards at PCIe 3.0 x16.
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January 19, 2013 4:17:05 AM

payturr said:
This is true, if you use a Pentium/Celeron/i3, it'll use the slot but at PCI-e 3.0 8x, better known as PCI-e 2.0 16x.
Hope this helped!


yeah, i hope so... coz i'm gonna build the entry-level pc and eligible to upgraded in the future (while the 1155/h2 socket still exist)...
January 19, 2013 4:27:15 AM

InvalidError said:
PCIe 3.0 @ x8 is not "better known" as PCIe 2.0 @ x16, they are two different things and just happen to have roughly similar usable bandwidth.

PCIe 3.0 lanes run at 8Gbps each (x8 = 64Gbps) while PCIe 2.0/2.1 lanes run at 5Gbps each (x16 = 80Gbps) and the card will run with as many lanes enabled as are available on the slot at whatever the highest speed both endpoints support.

Since the Pentium/i3 only support PCIe 2.1 and the motherboard likely supports x16, the board should be running PCIe 2.1 x16.

The only common case where a GPU may end up running whatever version of PCIe at x8 or x4 instead of x16 is for SLI/CFX where the 16-lanes GPU bus may get split between two x8 slots or a mix of x4 and x8. Some (very) high-end motherboards (~$600) have PCIe switches that allow running as many as four cards at PCIe 3.0 x16.


and how about the mobo's vendor said...
"PCI Express Gen3 Ready - Double PCIe 2.0 Bandwidth. PCIe 3.0, the next generation of 32GB/s transmission speed, doubles the bandwidth of previous generation interconnect"
sorry but i really confused...
January 19, 2013 4:40:08 AM

Your motherboard supports PCIe 3.0.

Neither a Pentium, Celeron, nor an i3 support PCIe 3.0.

You'd be running with PCIe 2.1.

Best solution

January 19, 2013 12:25:52 PM
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anthonie van hayu said:
sorry but i really confused...

The PCIe lanes that feed the main PCIe slot(s) is/are connected directly to the CPU. If the CPU only supports PCIe 2.1, the slots cannot go any faster than PCIe 2.1 regardless of what the motherboard says it may be capable of.

The motherboard may be "PCIe 3.0 ready" but that still requires a CPU and GPU that actually support that.

(All that "PCIe 3.0 Ready" means is that PCB traces from the CPU socket to the GPU slot(s) meet the signal integrity requirements for PCIe 3.0 and that the board has the necessary BIOS code to enable it if available on the CPU.)
January 19, 2013 7:14:16 PM

Best answer selected by anthonie van hayu.
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