ASMedia ASM1142 on X99 Taichi / Prof. Gaming i7

http://www.asmedia.com.tw/eng/e_show_products.php?item=155&cate_index=154

PCI Express Feature -Support PCI Express Gen2x2 or Gen3x1

Gen2x1 would present a theoretical 4Gbit/s transfer rate. No where near 3.1 speeds.

Do you already have this board? Or considering buying one?

Damn wrote: I do not have this motherboard, but I consider it as an option to buy. Of course, only if there is full implementation of the USB 3.1 features

In general, I would ask you if you believe that any USB revision, such as 2.0 or 3.0, on any board, provides the full theoretical speed in actual use.

I don't know where that Russian website got that diagram of the X99 chipset connections to the various IO devices. It is true that the PCIe lanes from the X99 chipset are PCIe 2.0, which would be the same for any mother board. Unfortunately, they don't show that one SATA port is normally implemented with two PCIe 2.0 lanes. They also don't show the multiplexing chips that are used to connect multiple PCIe 2.0 lanes to an IO device, that are used on the X99 Taichi board.

We know the real world maximum speed of a SATA III SSD on a SATA III port, for large file sequential read speed is ~550MB/s. This is the result of testing the X99 Taichi's USB 3.1 port in another review:



https://www.techpowerup.com/reviews/ASRock/X99_Taichi/11.html

The Marvell and ASMedia "SATA III" chipsets that are designed to be connected to one PCIe 2.0 lane, will not produce sequential read speeds beyond 400MB/s with a SATA III SSD. USB of course does not have the advantages of the SATA interface, such as NCQ provided by AHCI, so will always be slower than an equivalent bandwidth connection.

The only current PC chipset that has PCIe 3.0 lanes is the Intel Z170 (called DMI 3 by Intel), and will be used in future Intel chipsets.

This does not prove or disprove the claim of the Russian website, but is a demonstration of the actual capabilities of USB 3.1 on X99 and Z170 chipset boards. Given the test above, the Z170 boards have no advantage over X99 boards in USB 3.0 performance.

Currently, since none of the CPU/chipset manufactures (AMD, Intel) provide native USB 3.1 support, it is common for mother board manufactures to provide add on cards for USB 3.1 support. ASRock includes PCIe cards like that with some of their X99 boards, but not at the price point of the X99 Taichi.

Damn wrote: --- My question is simple and does not require detailed answer. On X99 Taichi MoBo. ASM1142 connected to the chipset using Gen2x2 or Gen2x1 That's all I want to know.

No need getting huffy with us. We're Moderators, and while very experienced with what we discuss we're not the smart folks who designed it.

Use this link and inquire of ASR Tech Support
http://www.asrock.com/support/index.asp

No harm.

If you would, please come back and post what they reply back with.