Hi,
I am looking for a budget mobo for my upcoming IB build.
I am going to put an AMD HD 6870 in it forthe time being, and crossfire it in future.
So, I need to have a board which can support crossfire decently wihthout bottlenecking my cards much.
I am given to understand that for a mid-range card like a 6870, an x16-x4 configuration is almost at par with a x8-x8 configuration. I know that an x8-x8 configuration is 5-10% faster for the second card, but that amount of performance hit I can take if it saves me some $$.
The one thing I am unclear about is that when crossfire is enabled with a PCi 3.0 lane initially at x16 speed with a PCIe2.0 lane also initially at x16 speed, do both of them get changed to x4, or the PCI3.0 lane remains at x16 with the PCIe2.0 slot degraded to x4???????????
For eg., I was looking at this motherboard -
http://www.gigabyte.in/products/product-page.aspx?pid=4140#sp
SO do both the lanes run at x4 or only the PCI2.0 gets turned into an x4???????//
I am looking for a budget mobo for my upcoming IB build.
I am going to put an AMD HD 6870 in it forthe time being, and crossfire it in future.
So, I need to have a board which can support crossfire decently wihthout bottlenecking my cards much.
I am given to understand that for a mid-range card like a 6870, an x16-x4 configuration is almost at par with a x8-x8 configuration. I know that an x8-x8 configuration is 5-10% faster for the second card, but that amount of performance hit I can take if it saves me some $$.
The one thing I am unclear about is that when crossfire is enabled with a PCi 3.0 lane initially at x16 speed with a PCIe2.0 lane also initially at x16 speed, do both of them get changed to x4, or the PCI3.0 lane remains at x16 with the PCIe2.0 slot degraded to x4???????????
For eg., I was looking at this motherboard -
http://www.gigabyte.in/products/product-page.aspx?pid=4140#sp
SO do both the lanes run at x4 or only the PCI2.0 gets turned into an x4???????//