PCIE2 and PCIE3 Mobo Help

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R

Radso

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May 25, 2014
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I am looking at adding a second R9 290 to my ASRock Z77 Pro3 mobo and noticed the following spec:

- 1 x PCI Express 3.0 x16 slot (PCIE2: x16 mode)
- 1 x PCI Express 2.0 x16 slot (PCIE3: x4 mode)

Does this mean that it will do
1) 16X and 4X at PCIE3, and
2) 16X and 16X at PCIE2?

also, if I was to just plug and play a second card onto this mobo, how do I change it from PCIE3 to PCIE2, the BIOS? Since it sounds like option #2 above would result in better performance...

I am using an i7 3770k, so the CPU will not be a problem.

Thanks for any help in advance!
 
Solution
Wolfshadw
If I remember correctly, when using two cards in a Crossfire configuration, the card in the PCI-E 3.0 slot will slow to PCI-E 2.0 throughput. So you'd have 1xPCI-Ex16 2.0 and 1xPCI-Ex4 2.0

PCIE3 and PCIE2 do not refer to the version of PCI-E slots, but the physical PCI-E slots on the motherboard. The top expansion slot (PCI-Ex1) is labelled PCIE1. The PCI-Ex16 3.0 slot is PCIE2, the next slot down, PCI-Ex16 (x4) is labelled PCIE3.

-Wolf sends
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Wolfshadw

Wolfshadw

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Aug 3, 2006
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If I remember correctly, when using two cards in a Crossfire configuration, the card in the PCI-E 3.0 slot will slow to PCI-E 2.0 throughput. So you'd have 1xPCI-Ex16 2.0 and 1xPCI-Ex4 2.0

PCIE3 and PCIE2 do not refer to the version of PCI-E slots, but the physical PCI-E slots on the motherboard. The top expansion slot (PCI-Ex1) is labelled PCIE1. The PCI-Ex16 3.0 slot is PCIE2, the next slot down, PCI-Ex16 (x4) is labelled PCIE3.

-Wolf sends
 
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