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Overclocking past 4.0GHz

post #1 of 5
Thread Starter 
I'm pretty new to this overclocking and for some reason I can't get past 4000MHz on my CPU. The only thing I have changed on my bios is CPU bus frequency which I have changed to 250. It runs stable on that and if I try to change it to 251 my computer's screen just turns black and says that my overclocking failed.

Here are some specs to my computer:
Motherboard: M4A87TD/USB3, CPU: AMD Phenom X2 555 Black Edition, Ram: Corsair 2x2GB DDR3 1333MHZ (CMV4GX3M2A1333C9),
Power Source: Silverstone 500W Strider Plus ATX 2.3 (SST-ST50F-P)

I use Windows 7 Home Premium 64-Bit and I just bought Antec Kuhler 1220 Watercooler for my CPU.
It would be great if I could get my CPU to 4.8GHz or even close, because now it feels like I bought that watercooler for nothing.

I've been trying to read some instructions on internet and some say that it's better to keep cpu voltage lower than stock and some say that the best voltage for it would be 1.475v or 1.5v or even 1.55v so I just don't really know what suits best for my computer.

I have also read that my ram could easily be overclocked to 1600MHz but I tried that and it didn't work.

I would be thankful if someone could give me some helpful tips because I want to get some value from that water cooler I bought. smile.gif
post #2 of 5
You have no chance of getting it to 4.8 stable. If you want to try you need to change the multiplier (cpu ratio). Also, dont go above 1.4v if you are unsure of what you are doing. Have you been checking your temperatures at 4.0ghz while running torture tests?
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RPI Compy
(14 items)
 
Sister's rig
(11 items)
 
Family HTPC
(10 items)
 
CPUMotherboardGraphicsRAM
5820k MSI X99S MPOWER GTX 980 Ti 8x4gb 3000 MHz Crucial DDR4 
Hard DriveCoolingOSMonitor
Samsung 950 Pro Custom WC loop 480mm & 560mm Windows 10 ROG SWIFT 
KeyboardPowerCaseMouse
CM Quickfire TK Greens Corsair RM1000w Custom 3d-printed case Steelseries Rival 
Mouse PadAudio
CSGO Steelseries Creative Aurvana Live! 2 
CPUMotherboardGraphicsRAM
Amd FX 8320 Asus sabertooth 990FX Nvidia GTX 760 4GB g.skill ares 12GB 
Hard DriveOptical DriveCoolingOS
Samsung 850 EVO 250GB HP thingy Phanteks TC12DX Windows 7 
PowerCaseMouse
Raidmax 530w White FD R4 Logitech G400 
CPUMotherboardGraphicsRAM
AMD A10 5800k Asrock pro-4 m His 6770 1GB G.skill 2133 8GB 
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post #3 of 5
Thread Starter 
My CPU core temps are at 27 Celcius (81 Fahrenheit) and motherboard if that even matters is at 30 Celcius (86 Fahrenheit) During torture tests.
Also my liquid temperature which goes to my cpu is at 34 Celcius. If I unlock my X2 cores to X3 with Asus Core Unlocker I can't check my CPU temps for some reason. Does it even make much difference to unlock 1 more extra core? Does it help me with overclocking?
What does that CPU Ratio actually do?
My CPU-Z tells me that my multiplier is at x16.0 so should I first switch my CPU bus frequency to the normal 200 and then use the multiplier or should I just use the multiplier with my frequency set to 250? And I also read that changing HT Link Speed should help with overclocking is that true? It's now set to auto and it's 2000MHz. Should I change that one too?
So many questions, but I hope that you have answers for some of them.
post #4 of 5
Unlocking a core will typically break the temperature monitoring within the CPU itself. This is common on CPUs where cores can be unlocked. Unlocking to x3 or even x4 if possible is recommended as you'll gain better multitasking ability and add length of life to your CPU as a gaming or productivity solution. No, it will not "help" with overclocking, if anything it will lower your overall overclock due to stability issues.

The CPU ratio or multiplier is a number that multiplies your base clock or FSB to produce the final clock speed of the CPU. For your CPU the default is 16. You said your FSB was 250, so 250 x 16 = 4000or 4Ghz. You have a Black Edition CPU, the whole point to them is having an unlocked multiplier whereas normally this is locked from the factory. Try lowering FSB to say 225, or even 200, and raise your multiplier to 18 or 18.5.
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XuperXeon
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Intel Xeon X5675 @ 4.6Ghz Asus Sabertooth X58 AMD Radeon R9 Fury Corsair XMS DDR3  
Hard DriveHard DriveHard DriveOptical Drive
OCZ Vertex 2 OCZ Vertex WD VelociRaptor LiteOn DVD/RW 
CoolingOSMonitorKeyboard
Corsair H100i GTX Windows 7 Ultimate x64 Hanns-G 27" LED Razer BlackWidow Ultimate 
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post #5 of 5
Thread Starter 
I just keep getting BSODs about my memory like 0x00000124 and page_fault_in_nonpaged_area every time I try to mess with my multiplier so I guess I'll run memtest86 overnight to see if there is some problems with my ram. I'll report back if it finds something. If it doesn't find anything, then I'll try to mess with my multiplier a little more or just settle with this stable 4.0GHz CPU.
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