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Gigabyte GA-945PL-S3P doesn't lock PCI-E clock

Joined
Mar 8, 2006
Messages
1,200 (0.17/day)
System Name Desktop / Laptop
Processor AMD Ryzen R7 5600x / Intel i5-4200U
Motherboard ASUS TUF B550-Plus / Lenovo MB
Cooling Arctic Liquid Freezer II 280 / Stock
Memory Corsair Vengeance 2x16GB DDR 3800 / 8GB DDR3-1600MHz
Video Card(s) AMD Radeon 6900XT / Intel HD 4400
Storage 2.5TB SSDs + 4TB HDD / Samsung 850 EVO 500 GB
Display(s) 34" LG Ultrawide / 12.5 " 1080p IPS Touchscreen
Case Fractal Design R6 / Lenovo X240
Audio Device(s) Onboard / Onboard
Power Supply Enermax REVOLUTION87+ 1000W / Lenovo 40W
Mouse Razer Basilisk X
Keyboard Dell Business Multimedia Keyboard
Software Windows 10 Pro 64 bit
Benchmark Scores Chicken Invaders 5 @125+ FPS
A friend of mine has a budget rig consisting of:

Gigabyte GA-945PL-S3P
Intel E2160
3GB DDR2 800 RAM
7600GT 128MB DDR3
640GB WD HDD

We wanted to overclock the CPU to get some extra boost and maybe do some folding/crunching. Since I know these CPUs overclock like crazy I immediately upped the FSB to 266MHz, locked the PCI-E to 100MHz, put the highest divider on the memory and upped the voltage a bit and to my big surprise it didn't post.

Then I started to increase the FSB bit by bit but even with max voltage on the FSB and PCI-E the machine wouldn't post above 220MHz. I started playing around in the bios and found out the only way to overclock more would be to set the PCI-E to Auto or to a frequency withing few MHz of the clock that would be when it's on Auto. This way i could get all the way to 280MHz rock stable with the only problem being that the PCI-E clock is around 145MHz if i remember correctly and sometimes the SATA controller is not found in the BIOS?!?!

Afterward I tried using the option that I use a 1333MHz C2D but even then the motherboard would post somewhere between 283-287MHz FSB and it changed every boot. So that didn't work too. I tried every bios version available and also tried the BSEL mod but with no luck since gigabyte boards use the CPUID to identify the CPU.

The only idea i had left is to try to modify the bios for the given CPUID that the default FSB is 266 or 333MHz, but from what i read on gigabyte boards that is rather difficult and i don't wanna risk a dead mobo since i have never done that before. If anyone has any other idea or some input it would be greatly appreciated. Also if someone has experience with modifying a bios i could provide the original. Reviews say that this mobo (just older revisions) should hit around 350MHz. This is the first revision with the 945 chipset that support 333FSB so i am surprised that this doesn't work
 
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