Originally Posted by Moragg
Originally Posted by bencher This
that is no longer available lol.
A quick google shows there are no AMD CPU's which actually support PCI-E 3.0, so a 990FX mobo with PCI-E3.0 is kinda useless. Oh AMD
You... Don't understand how AMD's FX boards work, do you?
There is no such thing as "CPU Support" because the NorthBridge is on the motherboard. The CPU connects to the motherboard in only 3 ways.
That's it. All PCI-e interaction is handled by the NorthBridge and any chips under it. That one motherboard had a PLX chip in it that enabled full 3.0x16 bandwidth between the cards, while using 2.0 x32 back to the NorthBridge.
Basicly it made two 7970s work exactly like a 7990.
Oh, and for future reference, "raw data" transfers at my resolution (3510x1920 32-bit color) are 25MB per frame. 1.5GB/s for 60fps. About 2GB/s per 4k monitor.
If using two GPUs with AFR, the second GPU only needs to send ~1GB/s of information to the other (30fps at 4k 32-bit) over PCI-e. That is the equivalent of a PCI-e 3.0 x1, or a PCI-e 2.0 x2.
Keep in mind this is already far higher than the resolution most people will play at. A 2560x1440 user will have to send half that. Same for a 1080p 120-fps user.
Even PCI-e 2.0 x8 slots will be able to deal with this just fine.
In other words, please stop crying about it. It will not affect you in any way unless you're trying to run quad-fire on PCI-e 2.0 x4's. Every Z68, Z77, Z87, and 990FX motherboard will be able to handle this.