ICH9/10 have 6 PCI-E v1.1 lanes for shared onbard device bus' and low bandwidth PCIE v1.1 slots, ie 1x or 4x.
You should also note when you overclock the system on the Host Bus side, you'll improve data going out (read burst) due to additional Host Bus bandwidth and cycles but on the other hand you are also creating a queue on the data coming in because Host Bus can push more data faster than DMI bus bandwidth is there. Raising PCIE frequency helps stabilize the spikes in IO reads, and improves IO write bandwidth because DMI clock is generated by clock generator PCIE dividers. Raising PCIE frequency beyond design can introduce signal integrity degradation from unshielded external EMI or cross chatter from selecting a similar reference frequency to a vendors own unique reference frequency, and then all hell breaks loose on your system
X38/X48/X58 have 36 PCIE v2.0 lanes. 32 lanes for PCIE slot allocation. 4 lanes for DMI (direct media interface, which is a dedicated two way point to point link on PCIE v2.0 4x bus) interconnect host link between PCH (x58) / MCH (x38/48) and IOH (ICHx).
P35/P45/etc have 20 PCIE v2.0 lanes. 16 for PCIE slot, 4 lanes for DMI.
ICH has always been on DMI, which behaves similarly to PCI while at the same time behaving like PCIE with VC (virtual channels) layer for QoS and transaction scheduling / interleaving for all IOH root bridge outgoing transactions with TAD (target address decode) destination beyond IOH scope or incoming bus transactions from MCH with TAD lying inside IOH.
ICH is given priority on DMI VC's and allowed to request priority transactions for dedicated 1-2 PCIE lanes. 300MB/sec is probably just the amount of DMI transaction bandwidth the ICH is limited to, because there are important LPC and SMBUS devices also living on the IOH and lest we forget all the routing management, strobe requests, priority transactions, and so on.
Both your lack of understanding and failure to take the time to go to Intels website and find the ICH datasheet for your model to get a better idea of "how Asus is screwing you over", you might have realized that Asus while many things still has to stick to Intel specifications for board chipset mechanical and electrical design, and on top of that you might have saved the Internet from the wild fires that you started in PC news gossip columns.
You should try and understand something or at least ask somebody who does understand it, to get a clearer picture on what actually happens. Even if it doesn't mean much to you to understand something, doing so is the key to not looking like a fool on the Internet or being sued for defamation outside the Internet.
Wild claims cost companies lost business, they lose enough they'll sick their lawyers on you to seek damages.
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