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question about pcie 3.0 and 2.0 crossfire

samule

Junior Member
Oct 17, 2012
22
0
0
Ok this question has been bugging me so i finally decided to join up here and ask the experts. So I am upgrading my cpu and mobo soon(old unlocked phenom b55 at 3.6 ghz) and i have 2 6850's in crossfire. the short way around this is i dont have enough cash to upgrade my GPU but an upgrade is needed. so i was wondering if i could have one card in the 3.0 slot and the other in the 2.0 slot and still have crossfire work at least until i can upgrade. i do know that 2.0 will work in a 3.0 slot and vise versa. its just can i have one in 3.0 and one in 2.0. i would much rather not run only one 6850.

thanks.

P.S. if you didnt notice im new here but ive been reading things on here for the last 2 years and i am glad to finally be a part of the forum!
 

notty22

Diamond Member
Jan 1, 2010
3,375
0
0
Welcome.
Link us to what platform / motherboard you are considering going with. There might be a better option. Or a different scenario than your seeing right now.
 

Termie

Diamond Member
Aug 17, 2005
7,949
48
91
www.techbuyersguru.com
[EDIT] It's not ideal to use a motherboard with both PCI 3.0 and PCI 2.0.

Like notty22 said, provide some links to the hardware you're considering and we can help you more.
 
Last edited:

Termie

Diamond Member
Aug 17, 2005
7,949
48
91
www.techbuyersguru.com
im not really worried about the speed, im just worried if it will work or not

here's what im looking at, lga 1155, z77

http://www.newegg.com/Product/Produc...82E16813128546
That's a very strange setup. I don't see why Gigabyte put both PCI 3.0 and PCI 2.0 slots on there. You'd be better off with a motherboard with dual PCI 3.0 slots, like this Asrock for about the same price: http://www.newegg.com/Product/Produc...l-Motherboards

Right now it comes bundled with 8GB of RAM for free.
 

samule

Junior Member
Oct 17, 2012
22
0
0
That's a very strange setup. I don't see why Gigabyte put both PCI 3.0 and PCI 2.0 slots on there. You'd be better off with a motherboard with dual PCI 3.0 slots, like this Asrock for about the same price: http://www.newegg.com/Product/Produc...l-Motherboards

Right now it comes bundled with 8GB of RAM for free.
awesome! i think ill go with that one then, i needed ram too anyways so to get it bundled is awesome. Thanks!
 

VirtualLarry

No Lifer
Aug 25, 2001
52,008
6,923
126
You won't find a motherboard with both PCI 3.0 and PCI 2.0. Perhaps what you mean is PCI 3.0 x16 and PCI 3.0 x4.
That's really not all that unusual. Mfgs route the CPU's PCI-E 3.0 lanes to the primary graphics card slot, and then route x4 PCI-E 2.0 lanes from the chipset to the secondary graphics card slot. I've seen it quite a few times.
 

Skurge

Diamond Member
Aug 17, 2009
5,195
0
71
Newegg has their info wrong. Only the x4 slot is pci-e 2.0. Which is common on quite a few boards.
 

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