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Overclocking Athlon II x4 640 on Biostar TA785G3

post #1 of 20
Thread Starter 
I can boot with these setting, but BSOD when running prime95. But when i change the vcore to 1.45v, I can't even boot up. I've seen others overclock with this chip, but not with the mobo. Can't lower the multiplier or northbridge with the biostar bios. I can only change volts, HT link, and fsb. Any help would be appreciated.

Shooting for 3.6.
3.3 with fsb at 220 x 15 with stock volts, and 10 min of prime95 blend test.
3.375 with fsb 225 x 15 with stock volts, bsod on prime95
3.6 with fsb 240 x 15 with stock volts, can boot but bsod with prime95
Changing volts causes pc to fail to boot.

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post #2 of 20
Let me be honest with you, I had the 630 with a Biostar board, and I couldn't even overclock from 2.8GHz to 3.5GHz without problems.

Get a different board for clocking.
post #3 of 20
Quote:
Originally Posted by singlecore2logical View Post
I can boot with these setting, but BSOD when running prime95. But when i change the vcore to 1.45v, I can't even boot up. I've seen others overclock with this chip, but not with the mobo. Can't lower the multiplier or northbridge with the biostar bios. I can only change volts, HT link, and fsb. Any help would be appreciated.

Shooting for 3.6.
3.3 with fsb at 220 x 15 with stock volts, and 10 min of prime95 blend test.
3.375 with fsb 225 x 15 with stock volts, bsod on prime95
3.6 with fsb 240 x 15 with stock volts, can boot but bsod with prime95
Changing volts causes pc to fail to boot.

What changes to the settings have you made in the BIOS on the T-Series tab? Have you gone into CPU Tuning under the OverClock Navigator and enabled Custom P-States?
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post #4 of 20
Thread Starter 
Quote:
Originally Posted by winginit View Post
What changes to the settings have you made in the BIOS on the T-Series tab? Have you gone into CPU Tuning under the OverClock Navigator and enabled Custom P-States?
Thank you for your patience. Total newb here. Didn't know what that was for.

Cpu Fid/Vid Control
P-States = Enabled
Core Fid x8.0 1600 mhz
Core Vid 1.275v
Core Did divided by 1
NB Vid 1.1500v
NB Fid 1800 mhz



So find the highest stable fsb? Just need to get to 240 for 3.6
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post #5 of 20
Core FID is your CPU multi....

Have you been trying to raise vcore by increasing CPU Voltage? Try increasing Core VID instead, and see if that makes a difference....
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post #6 of 20
Thread Starter 
Increasing cpu voltage causes a fail boot, so I'll try increasing the core vid instead.

All volts are on stock and auto for now.
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post #7 of 20
Quote:
Originally Posted by 8-Ball View Post
Let me be honest with you, I had the 630 with a Biostar board, and I couldn't even overclock from 2.8GHz to 3.5GHz without problems.

Get a different board for clocking.
Um, you were doing it wrong.

I had an Athlon II 620 and it overclocked like crap. You really need to throw volts at it to do much of anything. Increase your NB FID voltage to about 1.25v and just add more voltage your CPU core. Don't forget to back down on your HT Link multi / NB multi as you push the FSB. Try to keep them both around 2000mhz - 2300mhz then you can increase them later once you dial in some settings.
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post #8 of 20
Quote:
Originally Posted by singlecore2logical View Post
Increasing cpu voltage causes a fail boot, so I'll try increasing the core vid instead.

All volts are on stock and auto for now.
Also, go into Voltage Configuration and make sure that the voltage for the memory is up to specs....
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post #9 of 20
Thread Starter 
What should my memory volts be at? I think for my G. SKil, the recommended is 1.5v, which they are at.
1stAMD
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Athlon II x4 640 Biostar TA785G3 Evga Gtx 460 768mb G. Skill 4GB DDR3-1600  
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1stAMD
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CPUMotherboardGraphicsRAM
Athlon II x4 640 Biostar TA785G3 Evga Gtx 460 768mb G. Skill 4GB DDR3-1600  
Hard DriveCoolingOSMonitor
Spinpoint F3 500GB Thermalright HR-02 Windows 7 64bit Acer P236H 
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OCZ ModstreamX 600w HAF 912 
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post #10 of 20
Thread Starter 
Memory Over voltage is at 1.60v
1stAMD
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CPUMotherboardGraphicsRAM
Athlon II x4 640 Biostar TA785G3 Evga Gtx 460 768mb G. Skill 4GB DDR3-1600  
Hard DriveCoolingOSMonitor
Spinpoint F3 500GB Thermalright HR-02 Windows 7 64bit Acer P236H 
PowerCase
OCZ ModstreamX 600w HAF 912 
  hide details  
Reply
1stAMD
(14 items)
 
  
CPUMotherboardGraphicsRAM
Athlon II x4 640 Biostar TA785G3 Evga Gtx 460 768mb G. Skill 4GB DDR3-1600  
Hard DriveCoolingOSMonitor
Spinpoint F3 500GB Thermalright HR-02 Windows 7 64bit Acer P236H 
PowerCase
OCZ ModstreamX 600w HAF 912 
  hide details  
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