Overclocking Prerequisites: 1. A Phenom CPU, B2 or B3 is fine. B2 will not give you problems because of the TLB. I've had phenoms since they were released and I haven't had any problems like that. 2. An AM2+ Motherboard. Any board that is based off the 770, 780G, 790GX, 790X, 790FX, 780a, 750a, 730a chipsets should work for the guide, the 780a being the most ideal at this point in time at least until SB750 is released to be used with the 790FX chipset. 3. A good power supply. I will honestly never use a psu unless it was built by PC Power and Cooling, but just make sure you don't use a no name psu because that will cause enough problems by itself before you even start overclocking. 4. A semi-decent video card. I know not all of you will be overclocking for playing games, but for those of you that are, overclocking a Phenom and running a 7300 LE will give you almost no performance increase. If you have an AMD chipset board, I would recommend getting a crossfire setup because the increased bandwidth helps alot with performance. 5. Memory. A good set of DDR2-1066 is a must, a 2x1gb set is probably the best setup because 2x2gb's don't tend to overclock very well. 6. Cooling. Whatever you want, but the ideal temperature range for a phenom is just above freezing. Do not do anything colder than that or it will hinder your overclock rather than help it. I use a Thermalright Ultra 120 Extreme(TRUE) for cooling since I haven't bought a watercooling setup yet. 7. Programs for testing stability and for monitoring temperatures and voltages. Prime95 for CPU stability, Memtest86 for memory although running Super-Pi 32m is generally pretty good for checking, Speedfan for temperatures, voltages, and fan speeds. If you want to use other programs, that's personal preference. Links will be added at a later date. 8. Patience, and lots of it. Overclocking Phenoms will probably be the most trying experience of overclocking you've ever had, I know it has been for me. The Guide: Now that you have everything from the previous list, here are a list of options you need to find in your bios and make sure you remember how to get to them. 1. HTT - Should have a 200 by it somewhere, you might need to enable the options for overclocking to find it. 2. Voltage settings - There are alot of different voltage settings that can affect how good your overclock actually is, they include vCore, vCore-NB, CPU VDDA, vNB, vHTT, and vMem. 3. Northbridge multiplier - Like it says, you change the NB's multiplier with it, but it also can limit how high your HTT can go and a few other things too... 4. HT Link Speed - This option just needs to stay at 200*your NB multi, otherwise things get unstable pretty quick. 5. CPU Multi - This is the multiplier. It will be especially important to those with the black edition processors. 6. Memory timings settings. I won't go into much detail about these, but you'll need them because its one of the major components that could be going unstable. After finding everything in the previous list, you need to find the limits of each piece of hardware. For the Max HTT: Drop the cpu multi to the lowest number. Put the NB multi to 8x and the HT Link to 1.6ghz. Set the NB Voltage to 1.3. Set the memory voltage to its rated voltage and put the divider to DDR2-800. Set the cpu voltage to 1.3. Now start raising your HTT by 5 everytime you boot. If it doesn't boot for some reason, don't worry, its not dead. If you reach that point of no booting before 250htt, make sure you did everything in the list right before this paragraph. If it is somewhere after 250htt, then you will need to drop the NB multi to 7x and set the HT Link to 1.4ghz. Once you hit a point of no booting now, put it back to the last setting that did boot and run some stability tests to make sure that it is stable. If your gutsy, you can increase your nb voltage up to 1.4 if allowed and see if it gets you any farther. Just because something boots does not mean its stable, Ever. For stability for the HTT, you really don't need to run more than Memtest86 for an hour or do a few runs of Super-Pi 32m. Note: Some processors just can't get very high HTT at all, my 9600BE is currently maxed at 235htt. But that's why they give you the unlocked cpu multi anyway. For Max NB Speed: Set everything back to default from finding the max HTT if you did that before. For Regular Phenoms Drop your cpu multi back down to the minimum. Then try for the maximum htt on the nb 9x setting and ht-link 1.8ghz setting that you can using the same tactics for max htt, but do not drop the 9x setting down. Like before, if your gutsy you can set your nb voltage to 1.4v if it helps. For Black Edition Phenoms It is a much easier process with black editions. All you need to do is increase your nb multi and test for stability. For the Max CPU: Set VCore to 1.3v. Set NB Multi to 8x and HT Link to 1.6ghz. Set Memory divider to DDR2-800 and Memory Voltage to rated voltage. For Regular Phenoms Now increase the htt by 5 on every boot until the computer does not boot, then set it to the last bootable setting and then run stability testing. Using Prime95, run the small FFT's test for 6-8 hours or until you feel its stable, once you pass small FFT's then you need to run the large FFT's test. Have Speed fan or some other temperature monitoring program running while Prime95 is running and make sure temperatures stay below 55C. This is assuming that you are running air cooling or regular water cooling, not chilled water, phase change, Dice, or LN2. If there is an error found by Prime95, then you'll need to increase VCore. Only increase it by one setting, too much can cause the processor to overheat. If your processor is stable and you are comfortable enough to take it farther, then increase your VCore as needed to get the computer to boot at higher speeds and for it to stay stable as long as you keep your temperatures in check. For Black Edition Phenoms If you have a Black Edition that works similar to mine, then you'll have to get by with changing the cpu multi. I would recommend working up to the highest htt that works using the same strategy as the regular phenoms, and once that setting proves to be stable drop the htt back to 200 and set the cpu multi to what was closest to the speed you last tested for stability but not faster. Now do the same thing as before by adding 5htt, but do stability testing every time you boot. For Black Edition Phenoms AMD made the NB multi on Black Editions completely unlocked, meaning that setting it to 12x means you have your NB running at 2.4ghz. All you need to do is set your NB as high as you got it stable, so if you got it stable at 12x, then try to keep it at or just below 2.4ghz. Before running off to play games, run Prime95 small FFT's and then large FFT's. If it errors, you need to play around with vcore and vnb to get it to run stable. The Phenom FAQ: 1. What is the TLB bug and how would it affect me? The TLB bug is a problem on the chip with the TLB logic of the L3 cache. What happens is sometimes when data is being copied from the L3 to the L2 for it to be processed and before it gets back to its spot in the L3 some other data takes its place and then the original data is just "lost" which causes an error. It only shows up at high utilization on all cores at once, such as running several virtualizations on one system. The odds of finding this bug are slim to none, I myself have never noticed it. Virtualization is when you run multiple os's from the main os through a program like virtual pc. The TLB bug WILL NOT affect you during a gaming session even if that game uses all four cores. 2. What is the best motherboard I can use for my Phenom? There is no one best board in my mind, boards based off the 780a chipset would be the best at this time. Supposedly once SB750 comes out from AMD the 790FX boards will take the crown again. I personally use the Asus M3A32-MVP Deluxe, but DFI, MSI, Gigabyte, Biostar, Asrock, and Sapphire also have offerings at this time. The Asus Crosshair 2 Formula would probably be the best choice because of all the tweaking options and high htt stability. 3. What is the maximum voltage I should set? If you are using the stock cooler, don't use more than maybe 1.35v. If you are using aftermarket air, 1.4-1.45v depending on how good your cooler is. With water, 1.55 should be fine assuming its a good cooling kit and not one built for looks. Phase change cooling anything is acceptable as long as you keep the temperature to a maximum of 0C. 4. Ganged and Unganged. Ganged and Unganged are different ways of a Phenom accessing the memory. Ganged is the standard dual-channel 128bit path that is the standard way of doing dual channel. It is best for performance in single-threaded applications. Unganged splits the memory controller into 2x64bit paths so it is quicker access time in a multithreaded application. Disclaimer: I am not responsible if for some reason something does happen to your computer that it does not work anymore after following any part or all of this guide.