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FX-8150: Very high VCore for OC?

post #1 of 42
Thread Starter 
My overclocking experience is not extensive, and most of that is with Intel processors. So, please bear with me if I sound like a complete newbie.

Here's the basic gear:

Proc: FX-8150
Mobo: GA-990FXA-UD5 (v1)
RAM: 2x4GB Corsair Vengeance

Cooling: Custom water, 360mm + 120mm (dual GPU between the proc and the 120)

The BIOS is up to date. C1E, C6, K8, AMD APM and TurboBoost are disabled. RAM is booting @ 1333MHz and has passed extensive Memtest86 trials (12+ hours without error).

As I started in on overclocking my 8150, I initially set my multiplier to 22.5 for 4.5GHz and the VCore to 1.45. My intent was to get a ballpark estimate for a bootable OC as a starting point, per this thread.

The first problem appeared just beyond the Windows login, where I experienced a hard-freeze or BSOD 101. After trying a few combinations of lowering the multiplier and raising the VCore, I began running initial stability tests using Prime95 (blend and small FFT). I continued to get hard freezes, BSOD 101s and worker errors (rounding and illegal sumout). Temperatures have been fine during the tests, not peaking above 42C in HWMonitor.

The really perplexing part to me is that I can't even get to a stable 4.3GHz with a VCore of 1.55, the maximum recommended by AMD for a water-cooled system. The most stable OC I've been able to achieve is 4.1GHz @ 1.50 VCore, and even that doesn't pass long-term Prime95 tests; it has been stable for daily usage, to include video editing/encoding and gaming.

I know every chip and motherboard are different, but these results strike me as odd considering the number of forum threads I've found where people are achieving 4.5+ with substantially lower VCore, and even those with air-cooled systems are achieving stable OCs past 4.1GHz.

Am I missing an essential piece of the puzzle, or did I just get some bum hardware?

Any advice would be greatly appreciated.
post #2 of 42
Hi.
1. Clear CMOS.
2. I assume that you always flash the BIOS at stock settings.
3. PSU?
4. Try raising the CPU/NB voltage a bit. Helps with stability.
5. ALWAYS go in small steps. Lower the multi to x0.5 over stock, Vcore at stock, to see how it behaves.
Report back.
   
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post #3 of 42
Can't edit.
Your chip should be able to hit 700-800MHz more, at stock voltages. Check this out (same rules apply for your mobo as well)

http://www.overclock.net/t/1348623/amd-bulldozer-and-piledriver-overclocking-guide-asus-motherboard
   
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post #4 of 42
Thread Starter 
Quote:
Originally Posted by Grmadness View Post

Hi.
1. Clear CMOS.
2. I assume that you always flash the BIOS at stock settings.
3. PSU?
4. Try raising the CPU/NB voltage a bit. Helps with stability.
5. ALWAYS go in small steps. Lower the multi to x0.5 over stock, Vcore at stock, to see how it behaves.
Report back.
Quote:
Originally Posted by Grmadness View Post

Can't edit.
Your chip should be able to hit 700-800MHz more, at stock voltages. Check this out (same rules apply for your mobo as well)

http://www.overclock.net/t/1348623/amd-bulldozer-and-piledriver-overclocking-guide-asus-motherboard

Thanks very much for the replies.

Indeed, I always flash the BIOS at stock. My PSU is a Corsair AX1200.

I applied your recommendations and have no errors after 10+ minutes in Prime95 Small FFTs. The only exception is that I have not yet bumped the CPU/NB voltage; I simply missed it before I booted to the OS, but can I assume that's not essential until the OC gets a little higher?

I'll let this test run a little longer and then try the baseline from your link. I'll let you know what happens.

Thanks again.
post #5 of 42
Since you OC only the CPU, you wont actually need CPU/NB voltage. But if you want a good bump in performance, a NB Freq at 2700MHz is your aim.
In AMD systems, OC works like this.
1. RAM (tighter timings give better results). The most difficult and complicated part. That's why I always start from that.
2. NB Freq. The slowest part, and the one that provides the best results in real life apps.
3. CPU OC.
These are 3 links to a chain. If one link is not stable, the whole chain is unstable.
You are on water, so
1 Vcore voltage. Max 1.55v
2.CPU/NB Vid. Max 1.55v
3. NB Vid. Max 1.2v
4.DRAM voltage. (If your RAM operates at 1.5v, then go up to max 1.7v, though I would say at 1.6v you will be fine)
I'll be around.
   
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post #6 of 42
Thread Starter 
Quote:
Originally Posted by Grmadness View Post

Since you OC only the CPU, you wont actually need CPU/NB voltage. But if you want a good bump in performance, a NB Freq at 2700MHz is your aim.
In AMD systems, OC works like this.
1. RAM (tighter timings give better results). The most difficult and complicated part. That's why I always start from that.
2. NB Freq. The slowest part, and the one that provides the best results in real life apps.
3. CPU OC.
These are 3 links to a chain. If one link is not stable, the whole chain is unstable.
You are on water, so
1 Vcore voltage. Max 1.55v
2.CPU/NB Vid. Max 1.55v
3. NB Vid. Max 1.2v
4.DRAM voltage. (If your RAM operates at 1.5v, then go up to max 1.7v, though I would say at 1.6v you will be fine)
I'll be around.

Thanks, that's very helpful. I think for now I'll stick to the CPU... one roadblock at a time for me. wink.gif

So, on stock voltages across the board, I'm unable to pass a 10-minute, Small FFT test @ 3.9GHz. It locked up at about nine minutes. I'm going to continue with the prescribed adjustments from the thread you linked, but does it seem odd that I can't clear +300MHz on stock when the expected headroom is 700-800MHz?
post #7 of 42
Up the Vcore one bit and stress test at 3.9 again.
Maybe a bad chip. With my Phenom II, I can't go over 3.8, not even if I sacrifice my soul to the Devil. biggrin.gif
   
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MouseMouse PadAudio
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Frappenstein
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post #8 of 42
Thread Starter 
Quote:
Originally Posted by Grmadness View Post

Up the Vcore one bit and stress test at 3.9 again.
Maybe a bad chip. With my Phenom II, I can't go over 3.8, not even if I sacrifice my soul to the Devil. biggrin.gif

Initial Prime95 is indicating I'm stable @ 3.9 with a VCore of 1.375. Bumping to 4.0, however, and already up to 1.425V. That's somewhat discouraging, I must say.
post #9 of 42
In that case, may I suggest the old fashioned way?
Raising the FSB.
1. Clear CMOS.
2. Lower the RAM divider by one (if 6.66, set it at 5.33)
3. Set the FSB to 250, and then everything as close to stock as possible.
ALL voltages at stock.
4. Start raising the CPU multi by 1 incriment at a time, and stress test.
FSB OC helps in stability.
   
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ThermalTake Toughpower 800 (Non modular) ThermalTake Eureka 
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Pentium 4 1.7Ghz Northwood Gigabyte GA-8ITX Creative GeForce3 Ti 500 Some generic Samsung 512Mb 
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Hitachi 80 Gb Plextor CD-DVD RW  What was that again? Windows 98 SE  
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15'' CRT Broken Yes,it has. Fridge 
MouseMouse PadAudio
In the lab for exeriments  To disect the mouse Audigy 3 
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5930k ASUS Rampage V Extreme Sapphire R9 290 Ripjaws V 2400MHz  
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Pentium 4 1.7Ghz Northwood Gigabyte GA-8ITX Creative GeForce3 Ti 500 Some generic Samsung 512Mb 
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Hitachi 80 Gb Plextor CD-DVD RW  What was that again? Windows 98 SE  
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MouseMouse PadAudio
In the lab for exeriments  To disect the mouse Audigy 3 
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5930k ASUS Rampage V Extreme Sapphire R9 290 Ripjaws V 2400MHz  
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post #10 of 42
EDIT.
5. You will be able to set the FSB at a speed that resembles the actual RAM speed with the lowered divider. example (250x 5.33=1332.5->1333), if your actual RAM speed is 1600MHZ you can set the FSB at 300 (your mobo can handle it). 300x5.33=1599, the actual speed of your RAM. Just don't bump it that high immidiately.
   
Frappenstein
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Phenom ii x4 965 BE GA-MA-790FXT-UD5P Sapphire R9 290 Tri-x OC Kingston Value RAM 
RAMHard DriveHard DriveOptical Drive
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Optical DriveCoolingOSMonitor
Sony DVD/RW Xigmatec Aegir SD128264 Win 7 Home Premium 64 bit LG 2443T 
PowerCase
ThermalTake Toughpower 800 (Non modular) ThermalTake Eureka 
CPUMotherboardGraphicsRAM
Pentium 4 1.7Ghz Northwood Gigabyte GA-8ITX Creative GeForce3 Ti 500 Some generic Samsung 512Mb 
Hard DriveOptical DriveCoolingOS
Hitachi 80 Gb Plextor CD-DVD RW  What was that again? Windows 98 SE  
MonitorKeyboardPowerCase
15'' CRT Broken Yes,it has. Fridge 
MouseMouse PadAudio
In the lab for exeriments  To disect the mouse Audigy 3 
CPUMotherboardGraphicsRAM
5930k ASUS Rampage V Extreme Sapphire R9 290 Ripjaws V 2400MHz  
Hard DriveHard DriveCoolingOS
Intel 750 Series 400GB WD Caviar Black 1 Tb H-100i Win 7 64 bit Ultimate 
PowerCase
Super Flower 1600W Platinum Coolermaster Cosmos2 
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Frappenstein
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CPUMotherboardGraphicsRAM
Phenom ii x4 965 BE GA-MA-790FXT-UD5P Sapphire R9 290 Tri-x OC Kingston Value RAM 
RAMHard DriveHard DriveOptical Drive
Kingston Value RAM Seagate Barracuda (Died) WD Caviar Black Sony DVD/RW 
Optical DriveCoolingOSMonitor
Sony DVD/RW Xigmatec Aegir SD128264 Win 7 Home Premium 64 bit LG 2443T 
PowerCase
ThermalTake Toughpower 800 (Non modular) ThermalTake Eureka 
CPUMotherboardGraphicsRAM
Pentium 4 1.7Ghz Northwood Gigabyte GA-8ITX Creative GeForce3 Ti 500 Some generic Samsung 512Mb 
Hard DriveOptical DriveCoolingOS
Hitachi 80 Gb Plextor CD-DVD RW  What was that again? Windows 98 SE  
MonitorKeyboardPowerCase
15'' CRT Broken Yes,it has. Fridge 
MouseMouse PadAudio
In the lab for exeriments  To disect the mouse Audigy 3 
CPUMotherboardGraphicsRAM
5930k ASUS Rampage V Extreme Sapphire R9 290 Ripjaws V 2400MHz  
Hard DriveHard DriveCoolingOS
Intel 750 Series 400GB WD Caviar Black 1 Tb H-100i Win 7 64 bit Ultimate 
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