Widescreen Gaming Forum

Hey folks, I am in the process of building a machine for work that will run with 4x 5570's, however due to the limited number of authed supplyers for work, I am limited on the choice of mobo's and gfx cards I can use.

As such I am currently looking at an AMD/ASUS (crosshair formula IV) mobo that sports 4 16x slots in a 16x,8x,8x,4x configuration.

So I just wished to know if a 5570 will function (admitedly not at full capacity) on 4x pci-e lanes.

I have read reports online stating that crossfire has been known to work on a 16x,4x configuration, however I am unsure if this stands true still for the 5x series.
If anyone could confirm this works I would like to hear from you, perhaps Dave Baumann or SunSp*t may be able to confirm this at all?

Many thanks.
Delph

I don't know the answer, but I'm curious what purpose this machine would serve as quadfire has been known to be massively unstable.

Not running quadfire, its just a highly multi headed machine.
I suggested a pair of 6x display port cards, but the budget does not cover this, nor does the limited list of supplyers supply this product.

Its not something we actively test for at an individual board level, but PCI Express operating on a reduced number of lanes is part of the specification. Techpowerup actually runs a few graphics cards tests looking at operation on reduced numbers of lanes, and here's one in the same family at the HD 5570:

http://www.techpowerup.com/reviews/AMD/HD_5870_PCI-Express_Scaling/

Many thanks Dave for the information and link, it looks like it should work out just fine :)

Cheers.
Delph.

After building the system today I can confirm that all 4 cards function 100%, even the one in the 4x electrical socket. :D