USB插座、線長與速度的關係小測

平台
MB: ASUS M4A88TD-M EVO/USB3 (USB3.0:NEC D720200F @PCI-E)
USB2.0讀卡機: Epraizer SC-260 (Realtek RTS5169)
USB3.0讀卡機: Transcend RDF5
USB2.0延長線: PowerSync UAMF21K (1.8M)
SD卡: Sandisk Extreme SDHC UHS-I 16G

軟體
Win7 64bit SP
CrystalDiskMark 3.0.1 (500MB，3次)


A: SD卡 - 2.0讀卡機 - 2.0延長線 - MB(USB2.0插座)
Sequential Read : 18.769 MB/s
Sequential Write : 18.740 MB/s
Random Read 512KB : 18.779 MB/s
Random Write 512KB : 1.603 MB/s
Random Read 4KB (QD=1) : 3.037 MB/s [ 741.4 IOPS]
Random Write 4KB (QD=1) : 1.267 MB/s [ 309.2 IOPS]
Random Read 4KB (QD=32) : 3.073 MB/s [ 750.3 IOPS]
Random Write 4KB (QD=32) : 0.771 MB/s [ 188.3 IOPS]

Test : 500 MB [G: 2.5% (0.4/14.8 GB)] (x3)


B: SD卡 - 2.0讀卡機 - MB(USB2.0插座)
Sequential Read : 19.026 MB/s
Sequential Write : 18.780 MB/s
Random Read 512KB : 18.731 MB/s
Random Write 512KB : 1.612 MB/s
Random Read 4KB (QD=1) : 3.152 MB/s [ 769.5 IOPS]
Random Write 4KB (QD=1) : 1.254 MB/s [ 306.3 IOPS]
Random Read 4KB (QD=32) : 3.150 MB/s [ 769.0 IOPS]
Random Write 4KB (QD=32) : 0.772 MB/s [ 188.5 IOPS]

Test : 500 MB [G: 2.5% (0.4/14.8 GB)] (x3)


C: SD卡 - 2.0讀卡機 - MB(USB3.0插座)
Sequential Read : 20.856 MB/s
Sequential Write : 20.747 MB/s
Random Read 512KB : 20.480 MB/s
Random Write 512KB : 1.757 MB/s
Random Read 4KB (QD=1) : 3.948 MB/s [ 963.9 IOPS]
Random Write 4KB (QD=1) : 1.274 MB/s [ 311.1 IOPS]
Random Read 4KB (QD=32) : 3.715 MB/s [ 906.9 IOPS]
Random Write 4KB (QD=32) : 0.828 MB/s [ 202.0 IOPS]

Test : 500 MB [G: 2.5% (0.4/14.8 GB)] (x3)


D: SD卡 - 3.0讀卡機 - MB(USB3.0插座)
Sequential Read : 45.444 MB/s
Sequential Write : 42.288 MB/s
Random Read 512KB : 43.158 MB/s
Random Write 512KB : 1.712 MB/s
Random Read 4KB (QD=1) : 4.428 MB/s [ 1081.1 IOPS]
Random Write 4KB (QD=1) : 1.628 MB/s [ 397.5 IOPS]
Random Read 4KB (QD=32) : 4.091 MB/s [ 998.7 IOPS]
Random Write 4KB (QD=32) : 0.620 MB/s [ 151.4 IOPS]

Test : 500 MB [H: 2.8% (0.4/14.8 GB)] (x3)


E: SD卡 - 3.0讀卡機 - 2.0延長線 - MB(USB2.0插座)
Sequential Read : 31.529 MB/s
Sequential Write : 29.720 MB/s
Random Read 512KB : 32.264 MB/s
Random Write 512KB : 1.703 MB/s
Random Read 4KB (QD=1) : 3.929 MB/s [ 959.2 IOPS]
Random Write 4KB (QD=1) : 1.523 MB/s [ 371.9 IOPS]
Random Read 4KB (QD=32) : 3.741 MB/s [ 913.4 IOPS]
Random Write 4KB (QD=32) : 0.641 MB/s [ 156.5 IOPS]

Test : 500 MB [H: 2.8% (0.4/14.8 GB)] (x3)



看起來是否增加延長線的影響不大??
2.0讀卡機插在3.0還比較快一點點
3.0讀卡機插在2.0插座也比較快一點

而3.0讀卡機插3.0插座，確實有讓SD卡跑到標示的45MB的成績