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Gigabyte H87-D3H: No USB3 speeds


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#1
FuManchu84

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I just successfully installed Mavericks. 
Euphorically I bought a WD MyBook 4TB external hard drive but I only get speeds up to 40MB/S. In tests on the web this drive reaches speeds up to 130MB/S. I set XHCI to Smart in BIOS which doesn't make a difference. I also tried this without the USB3 kext GenericUSBXHCI.kext but that also makes no difference. I read in the forum that some are reaching USB3 speeds with this main board, so why is it so slow? Any Ideas?



#2
xpamamadeus

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I just successfully installed Mavericks. 
Euphorically I bought a WD MyBook 4TB external hard drive but I only get speeds up to 40MB/S. In tests on the web this drive reaches speeds up to 130MB/S. I set XHCI to Smart in BIOS which doesn't make a difference. I also tried this without the USB3 kext GenericUSBXHCI.kext but that also makes no difference. I read in the forum that some are reaching USB3 speeds with this main board, so why is it so slow? Any Ideas?

your problem is this  "no DSDT".

make one using pjalm dsdt patch for your board.

Really easy.

If u dont know how to do it say what bios version u use and i will upload a modded DSDT.



#3
FuManchu84

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Thanks for your help. I'm using "F5" Bios. I'm not really familiar with DSDT making so it would be great if you could help me out. Which kexts can I get rid of if I use a DSDT (see signature)?

#4
xpamamadeus

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Thanks for your help. I'm using "F5" Bios. I'm not really familiar with DSDT making so it would be great if you could help me out. Which kexts can I get rid of if I use a DSDT (see signature)?

u can get rid of AppleRTC Patch right now.

w8 5 mins and i upload dsdt for u then u MUST remove GenericUSBXHCI.kext

EDIT

Attached File  DSDT.aml.zip   15.26KB   8 downloads

here your DSDT.

remove hdaenabler kext if u use one!



#5
FuManchu84

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Hey thanks! I tried your DSDT and the computer boots up without any problems. I deleted GenericUSBXHCI.kext. But the problem is it didn't change anything about the speed of my USB3 drive. Something else must be wrong. I'm measuring the speed with "Blackmagic Disk Speed Test". And the external Drive should definitely be faster. So what else can I try out?



#6
FuManchu84

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I still didn't solve the problem but I realized some strange behavior. First of all: If your drive shows up under "USB 3.0 SuperSpeed Bus" under "USB" in the system report it runs with full USB3 speeds - if it shows up under "USB 3.0 HighSpeed Bus" it only runs with USB2 speeds.

After playing around a little bit with unplugging and re-plugig the drive at some point it ran with SuperSpeed (about 120 MB/S). I noticed that normally after booting the drive only runs with HighSpeed but when I unplug and re-plug the device when the computer is running, it re-connects to the "SuperSpeed Bus" and is running fast.

Sometimes it is already in SuperSpeed after booting but mostly it's only in HighSpeed. But when I plug the device to a running system it ALWAS runs in SuperSpeed.

I didn't find out completely what influences the Bus it connects to after booting but I noticed that it has something to do with the other USB drives that are connected.

But I can definitely say that GenericUSBXHCI.kext and the DSDT are NOT influencing the behavior.

Any ideas? Im still looking for a solution that the drive alway runs in SuperSpeed.



#7
FuManchu84

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Solved the issue! Although nobody seems to be interested (any more), here's the solution:
As soon as I disable "Legacy USB Support" in BIOS everything works perfectly. All the USB3 drives are runnig with "SuperSpeed" right from the start.

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