Poor USB 3.0 speeds when running in Windows XP

[PingSpike]

So I have a external USB3 hard drive. When running Bvckup 2 to copy files from a network location on it with windows XP the speeds are poor. I'm using a AMD A88x with A4-6300 cpu.

In XP:
With the onboard AMD USB3: About 21MB/s
With a pci-e USB3 NEC 7200200A card: About 21MB/s

In Windows 7x64:
With a pci-e USB3 NEC 7200200A card: About 72MB/s

In Windows 7x64 (different machine):
Using Intel Z77 backed USB3 port: About 60MB/s

In XPx64 (different machine):
Same hard drive using a Intel P67 motherboard system with its onboard USB: About 35MB/s

So I'm asking:
Does XP just suck at USB3? I know its old but Windows 7 almost predates USB3 as well. Because those speeds are more like USB2. I used USBView and confirmed they were running in super speed. I ran crystalmark on the hard drive and it actually was rating around 120/120 read/write in XP. But backups and file copies are unimpressive. Using fastcopy its sort of the same story.

 

[Spydermag68]

XP only supports USB 2.

 

[PingSpike]

Turns out this isn't really a USB3 problem at all. Crystalmarkdisk still gets the 120/120 MB/s R/W on the USB3 drive. I then ran the copy onto the local hard disk instead of the USB disk and it still only got 21MB/s.

I made a change to file caching settings as described here: http://smallvoid.com/article/winnt-system-cache.html And then I got 35MB/s on a quick test going to the local disk. Which is the same as WinXPx64. I think XPx64 uses that option by default simply because its based on server 2003. Still a far cry from the 60-70MB/s I was getting but its the only thing that pushed past the 21MB/s block I was getting with bvckup.