Crashman :
I've been a proponent of using the 2.5 Gb/s lanes on P55 boards because even after 8b/10b encoding, you get around 200 MB/s The limit of the controller Bytec (and nearly everyone else uses) is 200 MB/s, so you don't actually need to steal 5.0 Gb/s lanes from the graphics slot. Asus adds a PCIe bridge to some boards, to put two 2.5 Gb/s pathways to each 5.0 Gb/s controller, it's a nice solution but really not required at this point.
So .. you are saying that there is no need (this year) to even worry about any of the current crop (including MOST SSDs) of SATA3/USB3 devices, because they are not capable of saturating a PCIe2.o line.
You and I already had this conversation and this guy already owns the mobo (a great one) ... NOT trying to pee in anyone's cheerios or to foment doubt or dissatisfaction, here ... just an academic point, as a matter of history.
You also already told me that I am unlikely to "bully" INTEL into providing more bandwidth, at this price-point, any time soon. I believe you.
This bandwidth "non-issue" has almost no effect on gaming configs, but I still (very much!) contend that graphics and studio/edit rigs MUST have more lanes and slots AND ... I really hate that SLI/xFire governs the entire allocation of lanes/slot and which slots are active at what bandwidth, (automatic!) when you have 2 GPU slots full, and then you want to add some other cards, like Firewire (any flavor) or DeckLink HD-SDI type capture cards and OCZ slot SSD drives, etc.
Two slots should be added to the ATX standard layout (to accomodate for 2X Double Slot GPUs and still allow for one 8x and a 4x and at least a couple of 1x slots (it is as much a physical layout problem as a bandwidth issue.).
... And if the Double-Wide GPUs don't kill you ... and if bandwidth doesn't ... the mobo heat-sinks WILL !
= Tightness ! =