Can pci slot make your card underperform

[frizzoilnegro]

If i install a 1070 on a pci express 1.1 x16 will my performance decrease?

 

[DSzymborski]

If your motherboard has a PCIE 1.1 slot, which was phased out a decade ago for PCIE 2.0, your CPU is an unsuitable pairing with a 1070.

 

[BFG-9000]

It sure can, by about 5%. 980 is around as fast as 1070:

 

[aquielisunari]

If i install a 1070 on a pci express 1.1 x16 will my performance decrease?

No it won't. Okay, there may be a few FPS shaved off but nothing that would significantly impact performance. Take a look at this article http://www.guru3d.com/articles_pages/pci_express_scaling_game_performance_analysis_review,1.html . While it is a couple years old the information is still relevant.

 

[aquielisunari]

It sure can, by about 5%. 980 is around as fast as 1070:

Hello BFG-900

Where did you get that graph from. A Google search says Best guess for this image: pcie 8x vs 16x. Google must be wrong.

 

[junii421]

3.0: 3 is the fastest with no performance loss

2.0: If a 3.0 pci express gpu is put into a 2.0 very little performance loss, 2.0 does go into 3 (so does 1)

1.1: if a 2.0 or a 3.0 gpu is put here, with 2.0 it is little performance loss, and 3 is big noticeable loss

 

[BFG-9000]

I got it from here. Note there's less of a hit at 4k and dropping from 3.0 to 2.0 is only 1%. Any slower card will have even less impact from a slow PCIe bus.

Remember folks, the only thing that should be moving across PCIe are the instructions. If you run out of VRAM and start transferring textures over PCIe to system memory, then performance will drop >90% and it doesn't matter how fast the PCIe bus is!