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Why does the pciex16_2 lane disable usb 3.0? (P8P67)

post #1 of 4
Thread Starter 
So in the bios, my motherboard tells me that if I use a second card (260 for physx or something), usb 3.0 will be disabled. But why is that the case? Do they share the same power or something? And if I don't have any usb 3.0 devices, and use the 3.0 to 2.0 adapter, will I notice any difference with my 2.0 devices?
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post #2 of 4
Quote:
Originally Posted by consume View Post
So in the bios, my motherboard tells me that if I use a second card (260 for physx or something), usb 3.0 will be disabled. But why is that the case? Do they share the same power or something? And if I don't have any usb 3.0 devices, and use the 3.0 to 2.0 adapter, will I notice any difference with my 2.0 devices?
Are you saying that you currently have USB 2.0 devices connected to the USB 3.0 ports?
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It's a computer!
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post #3 of 4
Thread Starter 
Quote:
Originally Posted by TwoCables View Post
Are you saying that you currently have USB 2.0 devices connected to the USB 3.0 ports?
Yup. Right now i've got the usb 3.0 to 2.0 adapter though, so technically they are functioning as 2.0 ports right?
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post #4 of 4
Quote:
Originally Posted by consume View Post
Yup. Right now i've got the usb 3.0 to 2.0 adapter though, so technically they are functioning as 2.0 ports right?
Even without the adapter, USB 2.0 devices are only capable of taking advantage of the USB 2.0-ness of the USB 3.0 ports. It would be like connecting a SATA II drive to a SATA III port.

In other words, there is no benefit when connecting a USB 2.0 device to a USB 3.0 port.
It's a computer!
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CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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Reply
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