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View Full Version : How to check which stepping is my CPU?



Nehmia
10-16-2013, 07:36 PM
I heard our G750s have some bug when it comes out of sleep the USB ports don't work?

What is the stepping that I need to be looking for and where?

I launched CPU-Z but shall I look in Southbridge or what? and what stepping do I need

please explain

villiansv
10-16-2013, 08:27 PM
CPU-Z has a section called "stepping" on its main window.

Nehmia
10-16-2013, 08:57 PM
yes but what stepping should it be and under what? south bridge?

MrRuckus
10-16-2013, 09:14 PM
This is just a basic screenshot from CPUZ and not from a laptop. Stepping/revision depends on what Asus was using at the time your laptop was built. They can have different revisions and what not.

28046

Nehmia
10-16-2013, 09:24 PM
mine says Stepping 3 and Revision C0

does that mean I have the USB bug?

I did upgrade to BIOS 208

villiansv
10-16-2013, 10:27 PM
Check Mainboard tab, Southbridge revision number. 04 = C1 stepping = has bug. No way to fix. 05 = C2 = no bug.

Source - http://uk.hardware.info/news/35295/haswell-has-usb-30-issues-with-14-out-of-22-tested-usb-drives and many other easily google-able articles on this.

hmscott
10-16-2013, 11:11 PM
Check Mainboard tab, Southbridge revision number. 04 = C1 stepping = has bug. No way to fix. 05 = C2 = no bug.

Source - http://uk.hardware.info/news/35295/haswell-has-usb-30-issues-with-14-out-of-22-tested-usb-drives and many other easily google-able articles on this.

villansv, or anyone else out there, have you seen the bug cause a problem?

I haven't had a problem with USB drives, USB thumb drives, or any other USB devices plugged in while sleeping - they all show up and are accessible without a problem. I use both USB3.0 and USB2.0 devices.

I tried to recreate the problem, but can't make it happen, so perhaps I don't have the exact sequence down to make it fail. Anyone else able to recreate a failure on demand?

villiansv
10-16-2013, 11:47 PM
No, I have the buggy stepping too (like most if not all of us), but don't have any issues. I recall reading somewhere it doesn't happen with all usb3 drives, but can't remember where.

villiansv
10-16-2013, 11:55 PM
Here it is: http://uk.hardware.info/news/34321/intel-officially-confirms-usb-30-bug-in-haswell-updated-with-intel-statement

"...This issue has only been observed with a small subset of USB SuperSpeed thumb drives and does not affect other USB peripherals..."

No need to worry, really.

hmscott
10-17-2013, 12:18 AM
Here it is: http://uk.hardware.info/news/34321/intel-officially-confirms-usb-30-bug-in-haswell-updated-with-intel-statement

"...This issue has only been observed with a small subset of USB SuperSpeed thumb drives and does not affect other USB peripherals..."

No need to worry, really.

Excellent!

There is a tool, USBView, that we can use to identify SuperSpeed USB 3.0 devices. It is part of the Microsoft Windows Drivers Developer Kit, and I also found an older (but new enough?) version on SoftPedia:

How to determine whether a USB 3.0 device is operating at SuperSpeed?
http://blogs.msdn.com/b/usbcoreblog/archive/2012/06/27/how-to-determine-whether-a-usb-3-0-device-is-operating-at-superspeed.aspx#_Use_USBView_to

Windows Driver Kit (WDK) 8.1
http://msdn.microsoft.com/en-us/windows/hardware/gg454513/

USBView 2.0.1
http://www.softpedia.com/get/System/System-Info/USBView.shtml

My USB 3.0 devices are only showing up as Speed: High, not Speed: Super using the USBView 2.0.1

The only WDK kit I can find now is for Windows 8.1, I guess I will wait until after I update to 8.1 before installing the WDK.

Does anyone have a newer USBView link, or can test the 2.0.1 version with a known Super Speed 3.0 device?

Nehmia
10-17-2013, 08:40 AM
Does anyone have a newer USBView link, or can test the 2.0.1 version with a known Super Speed 3.0 device?

I have never experienced the USB bug but my Device Speed shows as HIGH in USB View 2.0.1

villiansv
10-17-2013, 11:47 AM
While usbview 2.0.1 shows nothing for my thumbdrive (probably due to weird USB drivers I installed some time ago), its read speed is 65MB/s, so it's clearly operating at superspeed. I haven't noticed the bug before, but admittedly I rarely use the drive. Will check after finishing with the 8.1 install.

villiansv
10-17-2013, 02:02 PM
It shows as HIGH for me now as well in usbview, though as I said it's operating at speeds much higher than USB2 HiSpeed could manage. Guess the program is wrong. I don't have the bug, tested by leaving it plugged in and letting the laptop go to sleep a few times. No disconnects, the drive was operational every time after waking up.