ICH9/ICH9R - Probleme mit der Bandbreite mit SSDs?

WARNING: It has recently been discovered that all Intel ICH9 and ICH9R chipsets which come on Intel 3 and 4 series motherboards exhibit a bandwidth limit of approximately 80MBps with Solid State Disk devices. This flaw has critically affected our benchmarking of SSD products. Benchmark Reviews has confirmed this with Intel Corporation, who are working on a solution. Please accept our apology for any confusion this may have caused.

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The interface is only a single PCIe 2.0 lane. The 6Gbps SATA spec allows for up to 750MB/s of bandwidth, but the PCIe 2.0 x1 interface limits read/write speed to 500MB/s. Pair it with a PCIe 1.0 x1 interface and you’re down to 250MB/s (and much less in reality due to bus overhead).
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Unlike Intel’s X58, the P55 and H5x chipsets don’t have any PCIe 2.0 lanes. The LGA-1156 Core i7/5/3 processors have an on-die PCIe 2.0 controller with 16 lanes, but the actual chipset only has 8 PCIe 1.0 lanes. And as we’ve already established, a single PCIe 1.0 lane isn’t enough to feed a bandwidth hungry SSD on a 6Gbps SATA controller.
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Gigabyte does the obvious thing and uses the PCIe 2.0 lanes coming off the CPU for USB 3 and 6Gbps SATA. This works perfectly if you are using integrated graphics. If you’re using discrete graphics, you have the option of giving it 8 lanes and have the remaining lanes used by USB 3/SATA 6Gbps. Most graphics cards are just fine running in x8 mode so it’s not too big of a loss. If you have two graphics cards installed however, Gigabyte’s P55 boards will switch to using the PCIe 1.0 lanes from the P55/H5x.

ASUS uses the same approach on its lower end P55 boards, but takes a different approach on its SLI/CF P55 boards. Enter the PLX PEX8608:
The PLX PEX8608 combines 4 PCIe x1 lanes and devotes their bandwidth to the Marvell 6Gbps controller. You lose some usable PCIe lanes from the PCH, but you get PCIe 2.0-like performance from the Marvell controller.

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FuXxMiTdOpPeLX schrieb:

http://benchmarkreviews.com/index.p...ask=view&id=80&Itemid=69&limit=1&limitstart=5

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Merlin-.- schrieb:

Soweit ich das verstehe, bezieht sich die Beschränkung der 1156 Boards ausschließlich auf SATA 6Gb/s. Da die Postville jedoch SATA 3Gb/s ist, ist diese Beschränkung irrelevant. Für SATA 3Gb/s stellt auch das 1156 Board die volle Bandbreite von ~250MB/s je SATA-Kanal bereit.

--> Ein 1156 Board tut es genauso gut wie ein 1366 Board.

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