x16 x4 CFX

asingh

Aspiring Novelist
OP
Jaskanwar Singh

Jaskanwar Singh

Aspiring Novelist
^^pch only provides 8 lanes for peripherals. the 16 lanes come from cpu. and i suppose asus has used some out of 16 for extra peripherals. only leaving x8 x4 for cfx. this is my asumption.

and why are these boards taking long to arrive here!!
 

vickybat

I am the night...I am...
PCIe allocation has been optimized in these boards so the lanes are not jammed all the time. I guess thats why we are seeing improved scaling even in reduced available lanes.
 

rajan1311

Padawan
So maybe even on those mini ITX Brazos boards, stull like 5670s will not at all be bottlenecked on the x4 lane...

Good stuff Jas, you have been doing some good work! Keep it up.

Now, dont do the same mistake as I did, study well too! :)
 

asingh

Aspiring Novelist
^^
Not really sure, cause once the 2nd PCI.E is enabled to full link in the BIOS (x4) rest of the lanes for USB and likewise get disabled.
 

Cilus

laborare est orare
The performance difference between Crossfire of X16-X4 mode, X4-X4 mode, X8-X8 and X16-X16 mode is very little, at least today's all current genration games.
The difference between X4-X4 CF and X16-X16 (X4 X4 is available is older gen PCI X 1.1 mobos with 16X 1.1 lanes as PCI Express 2X X4 provides the same bandwidth of PCI Express 1.1 X8) is maximum 8% in 1080P resolution in all the current games.
The difference between X8-X8 is actually less than 2% from the X16-X16 mode.
The discussed broad here runs at X16-X4 mode. So the performance difference will be more less.
This scenario has been tested with today's some of the top ends cards like GTX 460 or Hd 5870. Check the review of GTX480 scaling over here.
 

vickybat

I am the night...I am...
^^ X16 slot refers to the number of lanes present to transmit data serially in a full duplex manner( to and fro). So x16 slot has total of 16 lanes present and are serial in nature.

Data is transmitted and received between the end points of a link ( in this case, cpu & gpu). The 2.0 refers to bus speed.
 
Top Bottom