Interface transfer rate

UDMA6 = Ultra ATA 133 = 133MB/s

SATA I = 1.5 Gbit/s. Consider 8b/10b encoding, actual transfer rate = 1.2Gbit/s = 150 MB/s (1.2 / 8 = 0.15)
SATA II = 3.0 Gbit/s. Consider 8b/10b encoding, actual transfer rate = 2.4Gbit/s = 300 MB/s (2.4 / 8 = 0.3)
SATA III = 6.0 Gbit/s. Consider 8b/10b encoding, actual transfer rate = 600 MB/s
. SSD (especially SandForce SSD controller) can use the full speed of SATA III
. HDD , DRAM cache can also increase the performance and use the SATAIII speed.

PCIe
gen1: 250MB/s per lane (2Gbit/s?) spec: data rate 250MB/s ; transfer rate 2.5 GT/s
gen2: 500MB/s per lane (4Gbit/s?) spec: data rate 500MB/s ; transfer rate 5.0 GT/s
so, SATAIII host controller should have 2 lanes of PCIe gen1

USB
1.0 12 Mbit/s = 1.5MB/s
2.0: 480 Mbit/s = 60 MB/s
3.0 5.0 Gbit/s, raw throughput 4 Gbit/s, consider overhead 3.2Gbit/s = 400MB/s
(也有人說是 500MB/s)

2010產品設計：
nec host chip: use pcie gen2 * 1 = 500MB/s for two usb 3.0 ports (each 500MB/s) <若單顆能接近理論值，只能接一顆>
asus: marvell 88se9123 (no raid0, 1)
gigabyte: marvell 88se9128
marvell host chip: use pcie gen2 * 1 = 500MB/s for two sataIII ports (each 600MB/s)
. in 2010, HDD raid 0 throughput < 300 MB/s, so it seems enough
. but SSD is another story...

P55/H55/H57, cpu built-in 16 * pcie gen2, chipset PCH also supplies 6 * pcie gen2 (but 2.5GT/s mode)
gigabyte solution: standard: use PCH channels. turbo: use CPU channels
asus solution: use PEX8613. combine 4 PCH channels into 2 "REAL" pcie gen2
MSI solution: like asus.

http://www.techbang.com.tw/posts/2067-error-suspected-terms-of-service-abuse-please-see-httpcodegooglecomapiserrors
. raid 0 write maximum speed is lower than single HDD
http://en.wikipedia.org/wiki/Serial_ATA#SATA_Revision_1.0_.28SATA_1.5_Gbit.2Fs.29

http://chinese.engadget.com/2011/01/11/owc-aims-sandforce-based-mercury-aura-pro-ssd-at-2008-2009-mac/ OWC 為舊款 MacBook Air 推出 SSD 升級套件

http://chinese.engadget.com/2011/01/07/ocz-intros-vertex-3-pro-vertex-3-ex-and-z-drive-r3-pcie-ssd-at/ ces 2011
Vertex 3 Pro
新一代SandForce SF-2582 Controller
IOPS可到75000（by 4K）
讀取可達550MB/s
寫入可達525MB/s
(我們的神秘產品就可以滿此SSD的需求了) 但是只能滿足一顆?
Z-Drive R3
新一代SandForce SF-1565 Controller
PCI-E G2 × 8 (4000MB/s bandwidth)
IOPS可到135000（by 4K隨機）
讀取可達1GB/s
寫入可達950MB/s



http://www1.oc.com.tw/forums/forumview.asp?id=6&msgid=409
[SATA 6 Gb/s擴充卡開箱]華碩 PCIE GEN2 SATA6G讓老P45也有SATA 6 Gb/s
U3S6卡
. PCI Express x4 interface http://www.asus.com/product.aspx?P_ID=lGYmelQ8mJvPtYTv (gen1)
. (so...total 1000MB/s)

PCIE GEN2 SATA6G卡，單純提供SATA 6 Gb/s介面
. http://www.asus.com/product.aspx?P_ID=pXu758gzoQt3BV9s
. 它有 PLX bridge... 上面的U3S6沒有。U3S6 的 marvell chip 直接取用 pcie slot, 可能就是pcie gen1
. 但如果 U3S6 插在 VGA pcie slot 上呢?

http://www.asus.com/Search.aspx?SearchKey=u3s6