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How to overclock my cpu with biostar n68s3+ motherboard?

Last response: in Overclocking
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May 25, 2012 6:50:58 PM

My specs:
CPU: AMD Athlon ii x2 250
Ram: 4gb DDR3
Gfx Card: Radeon HD 5450
Mobo: biostar n68s3+
OS: Windows 7 ultimate 64bit

Under the performance tab in the bios are the following settings:
Cpu Frequency :200mhz
MCP PCI Express:100mhz
CPU Voltage: default
Chipset voltage: default
Ht voltage: default
CPU/LDT Spread spectrum: 0.5% hershey kiss.
These are the optimal values by the way.

Whenever I raise the cpu frequency my computer doesn't start.
May 25, 2012 7:15:33 PM

When I access the AMD Overclock tab i get the following settings:
Custom P-States [Enabled]
Core FID [x15.0 3000 MHz]
Core DID [Divided by 1]
NB FID [1600 MHz]
NB VID [1.400v]
NB DID [Divided by 1]
May 30, 2012 4:40:14 PM

RyanSammy said:
My specs:
CPU: AMD Athlon ii x2 250
Ram: 4gb DDR3
Gfx Card: Radeon HD 5450
Mobo: biostar n68s3+
OS: Windows 7 ultimate 64bit

Under the performance tab in the bios are the following settings:
Cpu Frequency :200mhz
MCP PCI Express:100mhz
CPU Voltage: default
Chipset voltage: default
Ht voltage: default
CPU/LDT Spread spectrum: 0.5% hershey kiss.
These are the optimal values by the way.

Whenever I raise the cpu frequency my computer doesn't start.


I'm having the exact same problem, I think.

I raise the CPU frequency by 15mhz, save and exit, and then it gives me the CMOS Checksum bad error. What am I doing wrong?
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June 3, 2012 3:41:09 PM

Bump
August 12, 2013 2:02:42 PM

Syphirr said:
RyanSammy said:
My specs:
CPU: AMD Athlon ii x2 250
Ram: 4gb DDR3
Gfx Card: Radeon HD 5450
Mobo: biostar n68s3+
OS: Windows 7 ultimate 64bit

Under the performance tab in the bios are the following settings:
Cpu Frequency :200mhz
MCP PCI Express:100mhz
CPU Voltage: default
Chipset voltage: default
Ht voltage: default
CPU/LDT Spread spectrum: 0.5% hershey kiss.
These are the optimal values by the way.

Whenever I raise the cpu frequency my computer doesn't start.


I'm having the exact same problem, I think.

I raise the CPU frequency by 15mhz, save and exit, and then it gives me the CMOS Checksum bad error. What am I doing wrong?

I have same problem. Bump!
June 19, 2014 12:10:34 AM

I have a Athlon x3 455 with BIOSTAR n68s3+. So our overclocking will be virtually identical in concept.. Ill try my best to explain.. The CPU Frequency that you increase to (im guessing) a random number, is actually the bus speed which is connected to the processor the RAM NB etc, So if you have a default value of 200Mhz and you have an idea that you want to overclock to a reasonable frequency then you can calculate. ill use my stats as an example. Athlon x3 @ 3.3 Ghz, 12 gb of DDR3 1600mhz ram.. so i want to try say 3.7 (or around that). this is what I did... 16.5(your default multiplier) / 3.7 (desired Clock Speed) = .220 then to convert from Ghz to Mhz = 220.. This is your new CPU number. This shouldn't give you have checksum error.. however because the CPU freq is the Bus which is related to the RAM speed that has to also be corrected for this mod. So, Ram is set at a multiplier of 8 because mine is DDR3. So 220Mhs * 8 = 1761Mhz which is pretty close to my 1600 limit so its worth testing, if it sends back errors I lower it until it doesn't (gets closer to 1600).. Now all of this said,,,, you have to compensate for the Voltage demands of increasing your frequency and this can cause DRASTIC temp increases. I would suggest you do a lot more research before plugging in numbers and crossing fingers..

I almost forgot. DO NOT just OC your rig and run it like that. Any changes of that sort should be stress tested for at least an hour (a stable system is error free for about 24 hr) I use Prime95 with CPU-Z and Core Temp... use something.

CPU - AMD Athlon x3 455 @ 3.8
MOBO - Biostart n68s3+ (Raden 5450)
RAM - 12 gig Corsair
OS- Duel boot win 7 / Debian linux
!