Hi all. First of all I wanted to thank all of you who've helped me in this community. I've learned a lot since I came in :D Now... I have another question xD I've got a dfi infinity nf4 mobo and a amd64 3700+ san diego. I've been able to O/c it from 2211mhz to 2815mhz so far by only increasing the voltage to 1.5v. I have only stock air cooling and the temperatures haven't even reached 50 degrees celcius at full load. I ran prime for 12 hours and 3dmark05 (all tests) for 6 hours and the thing has been completly stable. My fsb is at 255mhz, multiplier x11, ram at 1:0.8 ratio (now it's at 201mhz). Chipset and ram voltages are default. Looking at other threads, I read that Jam said "never enable spread spectrum!" and curiosity got in me, cause I had not messed with that in my bios. In my BIOS, all spread spectrums are by default disabled except the "cpu spread spectrum" that is put to "center spread spectrum". What is that exactly?, "center" spread spectrum? I read that the spread spectrum was something to improve stability by using "less agressive" energy connections through the motherboard... or something like that I read I don't remember. I wanted to try disabling the option but I wasn't gonna risk specially when my cpu is already overclocked. Does this option reduce overall perfomance? would it be dangerous to disable it? should I start the overclocking from scratch again to see how far can I go with the option disabled? I appreciate anything about it. Thankssssss once again Free

Have a look at this. http://www.adriansrojakpot.com/Speed_Demonz/BIOS_Guide/BIOS_Guide_02d.htm

Thanks. However... what does exactly "CENTER spread spectrum" mean? it's like 0.5%? And... how do I know if I am plaged with EMI (electromagnetic interference)? After reading that link I suppose I should disable the spread spectrum but what if I already have lots of EMI? wouldn't it be dangerous? thanks and forgive me for mi ignorance :P Free

Spread-spectrum clock generation (SSCG) is used in the design of synchronous digital systems, especially those containing microprocessors, to reduce the spectral density of the electromagnetic interference (EMI) that these systems generate. A synchronous digital system is one that is driven by a clock signal and because of its periodic nature, has an unavoidably narrow frequency spectrum. In fact, a perfect clock signal would have all its energy concentrated at a single frequency and its harmonics, and would therefore radiate energy with an infinite spectral density. Practical synchronous digital systems radiate electromagnetic energy on a number of narrow bands spread on the clock frequency and its harmonics, resulting in a frequency spectrum that, at certain frequencies, can exceed the regulatory limits for electromagnetic interference (e.g. those of the FCC in the United States, JEITA in Japan and the IEC in Europe). To avoid this problem, which is of great commercial importance to manufacturers, spread-spectrum clocking is used. This consists of using one of the methods described in the telecommunications section in order to reduce the peak radiated energy. The technique therefore reshapes the system's electromagnetic emissions to comply with the electromagnetic compatibility (EMC) regulations. It is a popular technique because it can be used to gain regulatory approval with only a simple modification to the equipment. Many personal computers have a BIOS setting to turn spread-spectrum clocking on or off. See external links on the bottom of this article. It is important to note that this method does not reduce the peak electrical or magnetic field strength emitted by the system, nor the total energy, and therefore does not make the system any less likely to interfere with sensitive equipment such as TV and radio receivers. It works because the EMI receivers used by EMC testing laboratories divide the electromagnetic spectrum into frequency bands approximately 120 kHz wide. If the system under test were to radiate all of its energy at one frequency, then this energy would fall into a single frequency band of the receiver, which would register a large peak at that frequency. Spread-spectrum clocking distributes the energy so that it falls into a large number of the receiver's frequency bands, without putting enough energy into any one band to exceed the statutory limits. Even more problematic, the existence of spread spectrum clock generation in PCs may substantially increase the radiated EMI. For this reason, the FCC certification testing is done with the spread spectrum function enabled, but the preferred BIOS settings for actual use typically turn off the spread spectrum feature. Thus, the PC may emit up to 20 dB higher EMI than permitted by the FCC Part 15 rules. This loophole exists because the BIOS writers include the ability to disable spread spectrum clock generation as a user setting, thereby defeating the object of the EMI regulations. Wikipedia. I agree; computing.net does need an edit button.

Ajá- Thanks a lot. However I just went and disabled it with my CPU already O'ced. jajja, nothing has happened til now, so I guess I'm ok. And 3dmark05 did score 18 more points! Free