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Topic Title: Phenom II X6 1055T won't OC above 3.5GHz
Topic Summary: Unstable when I push the front side bus speed even a little past 250
Created On: 06/25/2011 09:11 PM
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 06/25/2011 09:11 PM
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Joined: 06/25/2011

I'm running a 1055T on a Gigabyte GA-880GM-UD2H mobo with 8GB of G-Skill Ripjaws DDR3. The CPU cooling is done by an Antec Kuhler H2O 620. When OC'd to 3.5GHz this thing idles at around 19-20C and hasn't ever gone above 42C under extended Prime95 load.

The problem is, when I try to take the FSB even from 250MHz to 255MHz, the thing freezes when it tries to load Win7. I've tried every combination of voltages and multipliers for the NB, Memory and CPU that I can think of, and nothing fixes it.

Here's the CPU-Z screencap for my CPU (I did have to slightly overvolt it to even get it to 3.5GHz). Let me know if you need others.

I really hope someone out there has an answer. I'd like to get this thing to 4.0GHz stable, but if a 255MHz FSB speed won't work then 286 is definitely out of the question. Thanks for reading!
 06/25/2011 09:54 PM
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QB the Slayer
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Joined: 01/23/2010

When overclocking with FSB, you must make sure your RAM can handle the new speeds. If not you have to reduce the multi aplied to the RAM to keep it within the RAM's abilities. Much more info is needed for us to help you. Full system specs & RAM SPD tabs (for each slot populated) at the least.




CPU: AMD Phenom II X4 965 C2 (140W).||.Cooler: Corsair H80i
MB: Gigabyte 990FXA-UD7.||.RAM: 8 GB Mushkin Blackline DDR3 2000MHz (7-10-8-27-1T)
Case: CoolerMaster HAF 932.||.PSU: Corsair HX750
GPU:HIS IceQ 5 Radeon HD 5770 Turbo 1GB.||.Audio: Creative X-Fi Titanium Fatal1ty Pro w/ Logitech Z-5300e (5.1, 280W-RMS)
Drive: 2xKingston SSD 40GB RAID0.||.Storage: 6TB (4x500GB Caviar Black RAID0, 2TB Hitachi & 2TB Caviar Green)
 06/26/2011 03:12 AM
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Joined: 06/25/2011

Thanks for replying! I had been bringing the RAM multiplier down a tick or two, and even tried it at 4x, the smallest multi allowed, and I would still get either errors during POST or freezing/loss of video signal/other forms of instability during Win7 boot.

I also tried setting the FSB to 251MHz and it wouldn't cooperate, yet it is utterly rock solid at 250. Makes me wonder if there's something in the BIOS itself that won't let me OC beyond 3.5GHz. I'd call Gigabyte but that'd be about as helpful as posting this question on a dating advice forum. Anyhow, here are my specs:

CPU: AMD Phenom II X6 1055T (OC'd to 3.5GHz)
Memory: 8GB (2 x 4GB) G-Skill Ripjaws PC3-10700
Motherboard: Gigabyte GA-880GM-UD2H Rev 1.4, Award BIOS version F8
Audio: On-board
Graphics: ATi Radeon HD 5770
Cooling: Antec Kuhler H2O 620, push/pull fan config on radiator
PSU: Antec 550W
Case: Antec 900 with 4 120mm intake case fans, 1 top-mounted 200mm Antec BigBoy exhaust fan, and 2 exhaust fans in push/pull config on radiator
Storage: 1 Seagate Barracuda Green 2TB SATA 6Gb/s, 1 Western Digital MyBook 500GB USB 2.0, 1 Western Digital MyBook 1.5TB USB 2.0, 1 Hitachi XL2000 2TB USB 2.0
Optical: 1 Asus SATA 3Gb/s DVD-RW

Here are my CPU-Z tabs as requested:

Sorry for the long post, just trying to give you as much info as possible. Let me know if you need anything else. Thanks again!
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