The list of P55 motherboards to avoid if you want to use Crossfire or SLI

[milosd]

Dakle, ukoliko planirate prelazak na P55 i koriscenje dve grafike, izbegnite ove ploce:

Asrock P55 Pro
Asrock P55M Pro

Asus P7P55D
Asus P7P55D LE

Evga P55 Micro LE

Gigabyte GA-P55M-UD2
Gigabyte GA-P55-UD3
Gigabyte GA-P55-UD3L
Gigabyte GA-P55-UD3P
Gigabyte GA-P55-UD3R
Gigabyte GA-P55-US3L

MSI P55M-GD45

Razlog:

In order to cut on costs, on fourteen different motherboards, the second PCI-Express 16x is not connected via 8 lines to the PCI-Express controller of the LGA1156 processor (The first port then also being at 8x), but rather with 4 lines on the P55 controller.

On top of that, while the lines connected to the LGA1156 processor work at 5GT/s, the ones connected to the P55 only work at 2.5GT/s.

This result in a bandwidth of 1Gb/s in each direction for a PCI-Express 16x slot working at 4X with the P55 chipset, as opposed to 4GB/s when it’s working at 8x with the processor!

Needless to say, running Crossfire or SLI on a motherboard equipped with a 16x that works at 4x and is connected to the P55 chipset will cripple your performances.