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Syba PCI -Expres USB 2.0 5-port Host Controller Card
|Price:||$26.99 & FREE Shipping on orders over $49. Details|
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- PCI-E Specifications Revision 1.1 Compliant
- USB2.0 Specification Compliant
- Enhanced Host Controller Interface Specification for USB Revision 1.0
- Supported Real Time Dynamic Insertion and Removal of Devices
- Supports: High, Full, Low Speed Transmission
- Compliant with PCI-Express Base Specifications Revision 1.1 with data transfer rate up to 2.5Gbps.
- Compliant with Universal Serial Bus Specification Revision 2.0. Compliant with Open Host Controller Interface
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Top Customer Reviews
One more important note: If your PC crashes when after installing this, try changing the "PCI-E Maximum Payload Size" in BIOS to different values. Mine works perfect at 128. For all other values the system crashes.
I did some research, and discovered that there are two driver models for the USB 1.1 layer, and they're still important on USB 2.0 cards. The models are UHCI and OHCI, and while they look the same to the user and to software, they function very differently inside - the UHCI cards make the processor do all the grunt work of being a USB port, and the OHCI cards do it themselves, in hardware. This means that UHCI cards are generating a lot more bus interrupts than OHCI cards, and are also using more CPU (processor) time.
The latter isn't very important, but the interrupt load is _very_ important, in live audio capture, because you never want your captures to be interrupted by anything else.
_This_ is an OCHI chipset card, using a chipset made by NEC of Japan. It replaced a UCHI chipset card, which was made by Intel. And while there's no meaningful difference for most applications (printing, gaming, skype, etc), there is a _huge_ difference in a recording studio environment. My latency numbers in Ardour on Linux dropped from a working minimum of 30ms all the way down to what seems to be a workable minimum of 0.7ms - a 97.7% drop, far, far more than I expected.
As far as I know, NEC and SiS make only OHCI chipsets, and Intel and VIA make only UHCI chipsets. Other chipmakers, I don't know. But this card uses NEC chips, and so far, everything is great.
This card fixed the issues and both devices now work reliably.
I can verify what others have said about the Molex power connector, it's a very tight fit and you have to be careful plugging it in or the connector will bend and could possibly break the electical connections. But once you get it in, no problems with it.
I didn't pinpoint the freezing issue until it was too late to return for a refund, and I'm not interested in exchanging it for another. I know there are many good reviews on this card, and maybe I just received a dud, but I'm going to try either a different brand, or go with a USB hub.
Most Recent Customer Reviews
I purchased this card to provide USB 2.0 ports in a server that only has USB 3.0 ports and it does not recognize the card and the ports do not work. Until I get USB 2. Read morePublished 1 month ago by Rick Cowperthwaite
Bought this USB controller for my 2011 Power MAC, worked like a charm and has been for yearsPublished 3 months ago by Keneth Kramer
Pos fried my g930 wireless adapter which I bought this crap for in the first place and my xbox one wireless adapter.Published 6 months ago by Donald
The good news:
1) it has an green LED to tell you when you have the power cable attached properly
2) it uses the NEC chipset
This is a... Read more
Works very well. PNP. has bright green LED on when power is connected. I like that it has a standard molex connector too. used in ASUS Z-97 Pro motherboard with an I7-4790K CPU.Published 17 months ago by JOEL L.