而同样有很多同学用着四核或者开了四核的AMD CPU并且 使用
The Heat Wall
Throughout the better part of my overclocking I have repeatedly hit the same wall over and over again, and never realized what was going. This wall is what I like to call the Heat Wall. It is pretty simple: the Phenom IIs love to be cold, just like the Opterons from the socket 939. You go any higher than 55C on your CPU, usually you will have problems with keeping your OS stable. Now that the Phenom IIs have no cold bug, these new CPUs seem to has taken a liking to the cold more so than before.
To explain all of this in detail, I am going to bring you on a long journey through my frustration at trying to achieve 4.0 GHz on a 32 bit OS. From the very start of owning the 940BE I have constantly been trying to get 4.0 GHz, which should have been achievable with my setup. I have a decent water-cooling, RAM along with a great motherboard. But no matter what I did, I could only boot up for about 5 minutes, or instantly crash, or repeated BSODs. I have seen many people get to the 4.0 GHz using less efficient cooling, some using air setups. My guess is that they received a really good batch of CPUs, which happens. But for the rest of us, there was no way to get to the 4.0 GHz range without using extreme cooling. I finally lugged my computer outside to the freezing cold where I saw cold boot ups close to 5C. And what do you know, I could boot up into 4.0ghz and do whatever I wanted to do. After trying to go higher, I found that I could only go as high as 4.2 GHz. I tried this same process a couple days later but this time the temperature outside was a bit warmer so I did not get the same crazy low temperatures. This time I could only get up to 4.1 GHz. I tried the same settings I did before and there was no luck. I concluded my work saying that the computer must be colder.
When the 720BE came out I started to get data on what it could do as far as overclock. The data seemed to be the same and followed most of my rules, but there were those that went outside of everything. The 720BE data that was being ran on the AM3 socket, resulted in higher overclock with less voltage. But they still had a limit even if it was 35% above stock. This limit was the same I experienced with my 940BE. In which, no matter what settings you used and even though the CPU was only using 1.45v, you could not go any further without having to resort to extreme cooling.
Thus, there is a limit to the Phenom II at ‘X’ CPU temperature. No matter what you do, you will not be able to go any further with your CPU when it hits this wall. You should be able to notice when it hits this wall on a AM2+ system. Because normally your CPU should be somewhere near a load temperature of 55C. On an AM3 system, it is a bit more difficult to notice, but there is a general rule that you can use. If your CPU is not on extreme cooling, if your CPU has hit close to25-35% increase, and your load temperatures are below 50C but above 30C than you have most likely hit the wall.
My only suggestion to aground this wall, is to get better cooling. The main idea behind this section was to give you an understanding that there is a wall, and no matter what you do, you will not be able to go around it. I have seen many cases where people complain that even with no heave voltage and low temps, no matter what they do they cannot go further, unless they resort to extreme cooling. There may be another way but so far I have yet to see one.