Topic Title: C6 Instability Issues
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Created On: 10/21/2013 04:40 PM
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 10/21/2013 04:40 PM
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mkeyslehman
Peon

Posts: 2
Joined: 10/21/2013

I have two separate APU systems, and both have serious instability issues when C6 is enabled.

System1:

Llano A4-3400

ECS A75F-M2 FM1 AMD A75 (Hudson D3)

 2x2Gb Kingston HyperX 1600 RAM

Antec EarthWatts 500W PS

Windows 7 Pro x64

 

System 2:

 Trinity A8-5500

ASUS F2A85-M/CSM (Hudson D4)

2x4Gb GSkill Sniper 1866 RAM

SeaSonic SS-400FL2 400W PS

Win7 Home Premium x64

 

Both configurations have BIOS optimized defaults and no overclocking or any other such fiddling.  I've updated both BIOS and AMD drivers when updates are available and have made no difference.  If/when either system reboots or hard freezes, nothing is written to Event Viewer.

 

System 1 used to be my primary HTPC and would hard freeze in WMC.  I had assumed these lockups were the result of a cheap motherboard and purchased System2.  Re-purposing this system recently found it will not work at all with C6 enabled.  I have attempted to install both Win7 and Win8, and both will throw the system into a reboot loop once Windows loads.  It has been very stable with C6 disabled.

 

System 2 is an HTPC and hard freezes in WMC with C6 enabled.  I have never experienced a hard freeze outside of WMC, but then again, its whole purpose for existence is recording live TV.  There is no set amount of time before a hard freeze occurs; sometimes it happens immediately, other times WMC can run for hours.

 10/21/2013 05:47 PM
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WMudrockJr
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Posts: 705
Joined: 04/01/2013

Are these systems laptops the C6 state was design to save om battery power. I would leave this disabled so that all the cores are available.



-------------------------

AMD A10-5800K, XFX 7850 Ultra OC Edition 975MHz, 16GB RAM, Win 8.1 Pro 64 bit, MSI 7778 motherboard, 500W PSU, HP P7-1235, CCC 13.12 WHQL

 10/21/2013 06:08 PM
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mkeyslehman
Peon

Posts: 2
Joined: 10/21/2013

No, both systems are desktops.  I will certainly leave C6 disabled if it means a stable system, but efficiency for a PC that's constantly on in my living room was a big reason I went APU in the first place.

 

Subsequent research has found that there are two Win7 Hotfixes available for Bulldozer processors and core parking: 2645594 and 2646060.  While Trinity is Piledriver, much of the architecture is the same.  And System1's BIOS doesn't claim to support Win8.  Still open to suggestion and feedback.

 10/21/2013 06:48 PM
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WMudrockJr
Overclocker

Posts: 705
Joined: 04/01/2013

Be sure to have the Power Option set to Balanced so that the APU will throttle down when not needed. When you set it to High Performance they will never throttle back down. This will generate higher temps for the APU. 

I was on Windows 7 from July to Oct when Windows 8 came out and just upgraded to 8.1 release. My machine is on 24/7 unless there are bad storms. I monitor temps of the APU all the time to make sure every thing is ok.

Be sure to keep your system clean of dust and have a good air flow for your desktops.



-------------------------

AMD A10-5800K, XFX 7850 Ultra OC Edition 975MHz, 16GB RAM, Win 8.1 Pro 64 bit, MSI 7778 motherboard, 500W PSU, HP P7-1235, CCC 13.12 WHQL

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